Abstract:
An apparatus and method for transmitting/receiving an S-SCH in an Institute of Electrical and Electronics Engineers (IEEE) 802.16m wireless communication system are provided. A method for transmitting, by a transmitter, a Secondary Synchronization CHannel (S-SCH) in a communication system includes generating a sequence depending on a cell IDentification (ID), determining a subcarrier set comprising subcarriers to map the generated sequence, based on a Fast Fourier Transform (FFT) size and a segment ID, and mapping the generated sequence to the subcarriers of the determined subcarrier set.

Description:
PRIORITY 
     This application claims the benefit under 35 U.S.C. §119(a) to a Korean patent application filed in the Korean Intellectual Property Office on Jan. 7, 2009 and assigned Serial No. 10-2009-0001042, the entire disclosure of which is hereby incorporated by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a Synchronization CHannel (SCH) of a broadband wireless communication system. More particularly, the present invention relates to an apparatus and method for transmitting/receiving a Secondary SCH (S-SCH) for distinguishing a cell IDentification (IDcell) in an Institute of Electrical and Electronics Engineers (IEEE) 802.16m wireless communication system. 
     2. Description of the Related Art 
     Many wireless communication technologies have been proposed as candidates of a high speed mobile communication. Among these, an Orthogonal Frequency Division Multiplexing (OFDM) technology is now recognized as the leading next-generation wireless communication technology. In the future, it is expected that the OFDM technology will be used in most of the wireless communication technologies. At present, even the IEEE 802.16 Wireless Metropolitan Area Network (WMAN), which is referred to as a 3.5-Generation (3.5G) technology, adopts the OFDM technology as its standard. 
     The OFDM scheme is a scheme of transmitting data using a multi-carrier. Namely, the OFDM scheme is a type of Multi Carrier Modulation (MCM) scheme of parallel converting symbol streams input in series and modulating each of the symbol streams into a plurality of sub-carriers having cross orthogonality, i.e., a plurality of sub-channels for transmission. 
     In a system using the OFDM scheme, a Base Station (BS) transmits an SCH to a Mobile Station (MS) for the sake of timing synchronization and BS distinguishment. Accordingly, the MS may distinguish the BS to which the MS belongs using the SCH. A position where the SCH is transmitted is predefined between a transmitter and a receiver. As a result, the SCH operates as a kind of reference signal. 
     As a design method for the SCH, a variety of methods may be used, but the most noticed method is currently a method of loading and transmitting a Pseudo-Random (PR) sequence native to a BS on subcarriers at preset intervals in a frequency domain. In the case of mapping a sequence at preset intervals without loading and transmitting a sequence on all subcarriers, regarding a time domain signal after an Inverse Fast Fourier Transform (IFFT) operation, it may be identified that a repetition of a constant pattern takes place within an OFDM symbol. At this time, the repetition count is varied depending on the sequence mapping interval of the frequency domain. 
     An SCH used in an IEEE 802.16e system of the related art is described below. 
       FIG. 1  is a diagram illustrating a frequency domain signal of an SCH according to the related art. 
     Referring to  FIG. 1 , in the SCH of the related art, a sequence value is allocated at an interval of every third subcarrier in the frequency domain. 
     A time domain signal of an SCH corresponding to that of  FIG. 1  is illustrated in  FIG. 2 . 
       FIG. 2  is a diagram illustrating a time domain signal of an SCH according to the related art. 
     Referring to  FIG. 2 , the SCH of the related art has a format in which the same signal is repeated 3 times in a time domain. An MS acquires timing synchronization using a repetition pattern of the SCH. At this time, a size of IFFT is equal to the power of ‘2’ but ‘3’ (repetition count) is not equal to a divisor of the IFFT size and therefore, the three-time repetition pattern is not a complete repetition pattern but an incomplete repetition pattern. Accordingly, in case that the MS is positioned at a cell boundary or cell edge of a BS, there may occur a problem that, because an SCH of an adjacent cell acts as interference, the three-time repetition pattern is broken, thus causing a difficulty in performing timing synchronization. 
     Also, the SCH of the related art uses a sequence of the same length as that of the number of subcarriers allocated to one SCH. An IEEE 802.16e system of the related art uses 114 sequences to distinguish all of 114 BSs. For example when a length of IFFT is equal to ‘1024’, a length of each sequence is equal to ‘284’ which is the number of subcarriers allocated to one SCH. At this time, an MS determines correlation values between a received SCH signal and the 114 sequences previously possessed, and acquires a cell ID. 
     An IEEE 802.16m system, a system evolving from the IEEE 802.16e system of the related art, requires more cell IDs than the IEEE 802.16e system of the related art to support a Femto cell. Also, even the number of sequences of an SCH symbol for transmitting a cell ID is increased in proportion to the number of cell IDs. At this time, in general, a correlation characteristic between sequences is deteriorated and thus cell ID detection performance is degraded. Also, a Peak to Average Power Ratio (PAPR) of the sequence increases and thus a margin capable of boosting a transmit power of an SCH decreases. 
     Also, the IEEE 802.16m system may require that an SCH include supplementary information other than cell ID information for transmission. An example of the supplementary information may be a BS type, sector or segment information, a Fast Fourier Transform (FFT) size, a system bandwidth, etc. 
     Compared to the IEEE 802.16e system of the related art, the IEEE 802.16m system uses two different types of different symbols (i.e., a Primary SCH (P-SCH) and an S-SCH) to meet additional requirements of the increasing number of cell IDs, supplementary information transmission, etc. At this time, the IEEE 802.16m P-SCH and S-SCH have to divide and perforin a function of an IEEE 802.16e SCH and new functions required by an IEEE 802.16 in SCH. Accordingly, there is a need to define new functions to be carried out by each of the IEEE 802.16m P-SCH and S-SCH. Also, there is a need for a definition of a method for mapping between a sequence of each of the IEEE 802.16m P-SCH and S-SCH and subcarriers. 
     SUMMARY OF THE INVENTION 
     An aspect of the present invention is to address at least the above problems and/or disadvantages and to provide at least the advantages below. Accordingly, one aspect of the present invention is to provide an apparatus and method for transmitting/receiving a Secondary Synchronization CHannel (S-SCH) for making cell IDentification (ID) distinguishment possible in a broadband wireless communication system. 
     Another aspect of the present invention is to provide a method for mapping between a sequence of an S-SCH and subcarriers in an Institute of Electrical and Electronics Engineers (IEEE) 802.16m wireless communication system. 
     A further aspect of the present invention is to provide an apparatus and method for, in a transmitter, generating a sequence depending on a cell ID and generating and transmitting an S-SCH and, in a receiver, receiving the S-SCH and detecting the sequence in an IEEE 802.16m wireless communication system. 
     A yet another aspect of the present invention is to provide an apparatus and method for determining a subcarrier set including subcarriers to be mapped with a sequence, based on a Fast Fourier Transform (FFT) size and a segment ID in an IEEE 802.16m wireless communication system. 
     The above aspects are addressed by providing an apparatus and method for transmitting/receiving an S-SCH in a broadband wireless communication system. 
     According to one aspect of the present invention, a method for transmitting, by a transmitter, an S-SCH in a communication system is provided. The method includes generating a sequence depending on a cell ID, determining a subcarrier set comprising subcarriers to map the generated sequence, based on an FFT size and a segment ID, and mapping the generated sequence to the subcarriers of the determined subcarrier set. 
     According to another aspect of the present invention, a transmitter for transmitting an S-SCH in a communication system is provided. The transmitter includes a sequence generator for generating a sequence depending on a cell ID, and a subcarrier mapper for determining a subcarrier set comprising subcarriers to map the generated sequence, based on an FFT size and a segment ID, and for mapping the generated sequence to the subcarriers of the determined subcarrier set. 
     According to a further aspect of the present invention, a method for receiving, by a receiver, an S-SCH in a communication system is provided. The method includes extracting signals of a subcarrier set corresponding to a segment ID from a received signal, the subcarrier set being determined based on an FFT size and the segment ID, and demodulating the extracted signals of the subcarrier set and detecting a sequence dependent on a cell ID. 
     According to a yet another aspect of the present invention, a receiver for receiving an S-SCH in a communication system is provided. The receiver includes a subcarrier extractor for extracting signals of a subcarrier set corresponding to a segment ID from a received signal, the subcarrier set being determined based on an FFT size and the segment ID, and a demodulator for demodulating the extracted signals of the subcarrier set and for detecting a sequence dependent on a cell ID. 
     Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of certain exemplary embodiments of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings in which: 
         FIG. 1  is a diagram illustrating a frequency domain signal of a Synchronization CHannel (SCH) according to the related art; 
         FIG. 2  is a diagram illustrating a time domain signal of an SCH according to the related art; 
         FIG. 3  is a diagram illustrating a Base Station (BS) and a Mobile Station (MS) of an Institute of Electrical and Electronics Engineers (IEEE) 802.16m wireless communication system according to an exemplary embodiment of the present invention; 
         FIG. 4  is a diagram illustrating positions of a Primary SCH (P-SCH) and a Secondary SCH (S-SCH) in an IEEE 802.16m frame structure according to an exemplary embodiment of the present invention; 
         FIG. 5  is a diagram illustrating a subcarrier set at a 512 Fast Fourier Transform (FFT) size according to an exemplary embodiment of the present invention; 
         FIG. 6  is a diagram illustrating a subcarrier set at a 1024-FFT size according to an exemplary embodiment of the present invention; 
         FIG. 7  is a diagram illustrating a subcarrier set at a 2048-FFT size according to an exemplary embodiment of the present invention; 
         FIG. 8  is a diagram illustrating an arrangement of each sequence block in a frequency domain depending on an FFT size according to an exemplary embodiment of the present invention; 
         FIG. 9  is a graph illustrating a PAPR of an S-SCH signal corresponding to a cell IDentification (ID) at each FFT size according to an exemplary embodiment of the present invention; 
         FIG. 10  is a block diagram illustrating a construction of a transmitter for transmitting an S-SCH in an IEEE 802.16m wireless communication system according to an exemplary embodiment of the present invention; 
         FIG. 11  is a block diagram illustrating a construction of a receiver for receiving an S-SCH in an IEEE 802.16m wireless communication system according to an exemplary embodiment of the present invention; 
         FIG. 12  is a flow diagram illustrating a procedure for transmitting an S-SCH in an IEEE 802.16m wireless communication system according to an exemplary embodiment of the present invention; and 
         FIG. 13  is a flow diagram illustrating a procedure for receiving an S-SCH in an IEEE 802.16m wireless communication system according to an exemplary embodiment of the present invention. 
     
    
    
     Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures. 
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the present invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein may be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted for clarity and conciseness. 
     The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents. 
     It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces. 
     By the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide. 
     A way to generate and transmit/receive an S-SCH for distinguishing a cell IDentification (ID) in an Institute of Electrical and Electronics Engineers (IEEE) 802.16m wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme according to an exemplary embodiment of the present invention is proposed below. 
     An exemplary structure of the IEEE 802.16 in wireless communication system and a function of the S-SCH are described below. 
       FIG. 3  is a diagram illustrating a Base Station (BS) and a Mobile Station (MS) of an IEEE 802.16m wireless communication system according to an exemplary embodiment of the present invention 
     Referring to  FIG. 3 , in order for the IEEE 802.16m MS  300  and the IEEE 802.16m BS  310  to perform communication, the IEEE 802.16m MS  300  has to acquire a cell ID of the IEEE 802.16m BS  310  through an S-SCH signal transmitted by the IEEE 802.16m BS  310 . Here, the cell ID includes a segment ID. 
       FIG. 4  is a diagram illustrating positions of a Primary SCH (P-SCH) and a Secondary SCH (S-SCH) in an IEEE 802.16m frame structure according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 4 , in the IEEE 802.16m frame structure, a super-frame has a time interval of 20 msec, and includes four frames each having a time interval of 5 msec. In an exemplary implementation, one P-SCH symbol and three S-SCH symbols may be positioned at intervals of 5 msec within one super-frame. The P-SCH symbol is positioned within a Super-Frame Header (SFH). Here, although the P-SCH symbol and the S-SCH symbols are changed in number and position, it is undoubted that the proposal of the exemplary embodiment of the present invention is substantially identically applicable. 
     A method for determining a subcarrier set corresponding to each segment ID according to an exemplary embodiment of the present invention is described below. 
     In an exemplary embodiment of the present invention, a length (N SSCH ) of a sequence for an S-SCH is varied depending on a size of FFT. The length (N SSCH ) of the sequence for the S-SCH is equal to ‘144’ at a 512-FFT size, ‘288’ at a 1024-FFT size, and ‘576’ at a 2048-FFT size, respectively. The subcarrier set corresponding to each segment ID is determined in Equation 1 below: 
     
       
         
           
             
               
                 
                   
                     SSCHCarrierSet 
                     n 
                   
                   = 
                   
                     n 
                     + 
                     
                       3 
                       · 
                       k 
                     
                     + 
                     
                       40 
                       · 
                       
                         
                           N 
                           SSCH 
                         
                         144 
                       
                     
                     + 
                     
                       ⌊ 
                       
                         
                           2 
                           · 
                           k 
                         
                         
                           N 
                           SSCH 
                         
                       
                       ⌋ 
                     
                   
                 
               
               
                 
                   ( 
                   1 
                   ) 
                 
               
             
           
         
       
     
     In Equation 1, ‘SSCHCarrierSet n ’ denotes an n -th  subcarrier set, and ‘n’ denotes an index of a subcarrier set corresponding to a segment ID and has a value of ‘0’, ‘1’, or ‘2’. Assuming that there exist all three segments and each of the segments is expressed as ‘Segment 0 ’, ‘Segment 1 ’, or ‘Segment 2 ’, ‘Segment 0 ’ uses a subcarrier set (SSCHCarrierSet 0 ), ‘Segment 1 ’ uses a subcarrier set (SSCHCarrierSet 1 ), and ‘Segment 2 ’ uses a subcarrier set (SSCHCarrierSet 2 ). ‘k’ denotes a miming index having a value of ‘0’ to ‘N SSCH −1’ depending on an FFT size. A position of a Direct Current (DC) subcarrier in the subcarrier set is equal to ‘256’ at a 512-FFT size, ‘512’ at a 1024-FFT size, and ‘1024’ at a 2048-FFT size, respectively. 
       FIGS. 5 ,  6 , and  7  each are diagrams illustrating subcarrier sets each corresponding to segment IDs at a 512-FFT size, a 1024-FFT size, and a 2048-FFT size according to an exemplary embodiment of the present invention. 
     As illustrated in  FIGS. 5 ,  6 , and  7 , in the left and right regions centering on a DC subcarrier, subcarrier sets each corresponding to segments are comprised of subcarriers each having three intervals. Near the DC subcarrier, a subcarrier set is comprised of subcarriers each having four intervals. A description is made below in detail by way of an example with respect to  FIG. 5 . At a 512-FFT size, a subcarrier set (SSCHCarrierSet 0 ) used in a ‘Segment 0 ’ has subcarrier indexes of ‘40’, ‘43’, ‘46’, ‘49’, . . . , ‘247’, ‘250’, ‘253’, ‘257’, ‘260’, ‘263’, . . . , ‘464’, ‘467’, and ‘470’. That is, in each of the left and right regions centering on a DC subcarrier index of ‘256’, the subcarrier set (SSCHCarrierSet o ) is comprised of subcarriers whose indexes increase by ‘3’. An interval between the subcarrier indexes of ‘253’ and ‘257’ near the DC subcarrier is equal to ‘4’. 
     If a subcarrier set is determined as above, a three-time repetition pattern of the IEEE 802.16e SCH of the related art does not appear in a time domain. This feature is advantageous in that, in a coexistence mode in which an IEEE 802.16m BS supports all of an IEEE 802.16e MS and an IEEE 802.16m MS, there exists only one type of symbol in which a three-time repetition pattern appears in a time domain and thus, each MS easily acquires timing synchronization. 
     A method for determining a sequence corresponding to a cell ID according to an exemplary embodiment of the present invention is described below. 
     An exemplary embodiment of the present invention proposes to use all of 768 cell IDs (IDcell). A value of the cell ID has a range of ‘0’ to ‘767’, and is determined by a segment ID (n) and a running index (Idx) as in Equation 2 below. Here, the segment ID (n) has a value of ‘0’, ‘1’, or ‘2’, and the limning index (Idx) has a value of ‘0’ to ‘255’.
 
 IDcell= 256 ·n+Idx   (2)
 
     An S-SCH sequence corresponding to the cell ID determined through Equation 2 above is configured using eight sequence blocks (S 0 , S 1 , . . . , S 7 ). Lengths of sequences included in each sequence block (S 0 , S 1 , . . . , S 7 ) are equal to ‘72’. 
       FIG. 8  is a diagram illustrating an arrangement of each sequence block in a frequency domain depending on an FFT size according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 8 , in the case of a 512-FFT size, a sequence corresponding to a running index (Idx) is sequentially selected from sequence blocks S 0  and S 1 , and the sequentially selected sequence is modulated into a power-boosted BPSK signal and is sequentially mapped to a subcarrier set corresponding to a segment ID (n). In the case of a 1024-FFT size, a sequence corresponding to a running index (Idx) is sequentially selected from sequence blocks (S 2 , S 0 , S 1 , and S 3 ), and the sequentially selected sequence is modulated into a power-boosted BPSK signal and is sequentially mapped to a subcarrier set corresponding to a segment ID (n). In the case of a 2048-FFT size, a sequence corresponding to a running index (Idx) is sequentially selected in sequence blocks (S 4 , S 5 , S 2 , S 0 , S 1 , S 3 , S 6 , and S 7 ), and the sequentially selected sequence is modulated into a power-boosted BPSK signal and is sequentially mapped to a subcarrier set corresponding to a segment ID (n). A structure of  FIG. 8  in which S-SCH signals are overlapped depending on a frequency bandwidth is referred to as a scalable structure. As such, an S-SCH signal is comprised of sequences having a feature of scalability for a variety of FFT sizes and thus, there is an advantage that an S-SCH may support a variety of MSs each supporting different bandwidths. 
     Table 1 below is a hexadecimal expression of an example of a sequence corresponding to a running index (Idx) by sequence block. A length of each sequence is equal to ‘72’. 
     
       
         
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
             
             
               
                 Idx 
                 S 0   
                 S 1   
                 S 2   
                 S 3   
               
               
                   
               
               
                 0 
                 602CFC3499A4B346A1 
                 D6D04E0C95CCE7C60F 
                 60C5F82E201678AF4D 
                 54AF23D77D49C9209F 
               
               
                 1 
                 19F90B577AF31B289D 
                 EEF8AEBA56D7832F09 
                 781F066BACDD3A90F3 
                 5DBB49C352F7DCC37B 
               
               
                 2 
                 58041C83A54037A858 
                 CE154FB719785A01B1 
                 69CE6DC40FD792B4A9 
                 564E5B7C86A3C9863E 
               
               
                 3 
                 21CE141FB9E8603E64 
                 F62250FE25E3211748 
                 71149381831CD08CE8 
                 5F45CE97569DC39A25 
               
               
                 4 
                 78E9FD8EEA900E86E0 
                 DFC423E6BA72EDDDEB 
                 6224877A240387F613 
                 54FA5BD629497C7895 
               
               
                 5 
                 013C0AED09B846E8DC 
                 E7F33CAF86966934ED 
                 7AE186C1A8B725CE52 
                 5DF1C9C206F7766371 
               
               
                 6 
                 40DEE539D674959019 
                 C71EDA5D36B9B01DAA 
                 6B2F156FF4426DEDF7 
                 5604DB7C2D5C832634 
               
               
                 7 
                 3914EA5BCADCC20625 
                 FF29C515F5A2CB0CAC 
                 73F5ECD478F6CFD249 
                 5F0F4E97FD6296C5D0 
               
               
                 8 
                 69389621499AB95ABA 
                 D43131596E590760AE 
                 608F7FD174692DF747 
                 54B0F17DD6C9D6D5CA 
               
               
                 9 
                 10ED66BCAACD0ECB79 
                 EC062E1052BD838E57 
                 7855819507226FCF06 
                 5DA49C96068823362E 
               
               
                 10 
                 510F8E978AFE224BBC 
                 CCEBC8E31D125AA0EF 
                 6984EDC4A45727ECA3 
                 565189D7D2DC298C94 
               
               
                 11 
                 28C581F469D66A227F 
                 F4C32FABDE76DE49E9 
                 715E1380D71C65D31D 
                 5F5A1C3C029DDC6F70 
               
               
                 12 
                 71FD9064C52E049AFB 
                 DD255B4CBE670D7CB5 
                 626E077A8F832D5619 
                 54E5897D7D36838DC0 
               
               
                 13 
                 083798F8D9864CF338 
                 E50DBC0582838995B3 
                 7AAB013F0348709658 
                 5DF1E3695288899624 
               
               
                 14 
                 49CA88D3F9B57F8C02 
                 C5FFA2F6CD53B0BCF4 
                 6B7A6A90A042C74A02 
                 561B09D77923632C9E 
               
               
                 15 
                 300087B01A9D281DC1 
                 FDD74241F1C8D455F2 
                 73BF6CD52C898575BC 
                 5F109C3CA91D69377A 
               
               
                 16 
                 62D27C9F624EB3E000 
                 D69ACE0C3E33AD6605 
                 60DA2A848BE998A218 
                 54AF23D77C63638DCA 
               
               
                 17 
                 1B078BFC81190471C3 
                 EEADD6BAFD28D67703 
                 7800D33EF8A2C56259 
                 5DBB49C2AC229669D1 
               
               
                 18 
                 5AE564285EAA28F106 
                 CE5FC849B2F8F0A1BB 
                 69D1B890A4286D41FC 
                 5651A48287F69CD36B 
               
               
                 19 
                 233094B5BDFD809F3A 
                 F67728FE8E1C7448BD 
                 710B46D528E3308642 
                 5F45CE96A83776CF70 
               
               
                 20 
                 7A0882DB117A11DFBE 
                 DF8EA3E6118DA77A1E 
                 6224AA2E8F83980346 
                 54FA5C29D7E3D6D23F 
               
               
                 21 
                 03DD75B90DD2464982 
                 E7A644AED296DC6CE7 
                 7AFE53950348DA3CF8 
                 5DF1CE3DF85DC331DB 
               
               
                 22 
                 4220626C2D9E953147 
                 C74BA25D9D46FABDA0 
                 6B2F383AA03D921F5D 
                 561B24822C09D67361 
               
               
                 23 
                 3BEA6D0E31493D5884 
                 FF634514A1DD81AB59 
                 73F5C67ED376CFD8E3 
                 5F0F496803C823977A 
               
               
                 24 
                 6BC611754D8F46041B 
                 D47BB6A63A26523F5B 
                 608F557A20692DFDED 
                 54AF0E8228637C789F 
               
               
                 25 
                 120C19E951271195D8 
                 EC5351EEF942D6D1A2 
                 7855AB3E53226FC5AC 
                 5DA49B6807A2966484 
               
               
                 26 
                 53EEF63D8E943D151D 
                 CCBEB71C4912F0071A 
                 699B38900FA8C7E1F6 
                 564E76282C0963263E 
               
               
                 27 
                 2A3B015E6DBC6A8321 
                 F489A8548A098B161C 
                 7141C6D47CE385D9B7 
                 5F5A1BC203B7693DDA 
               
               
                 28 
                 731CE8CEC144043C5A 
                 DD70234C159847DB40 
                 626E2DD1DBFCCD5B4C 
                 54FA717C83E3C92095 
               
               
                 29 
                 0AD6E7ACDDEC4C5599 
                 E5473BFB29033CCDB9 
                 7AB4D395A8B7909CF2 
                 5DF1E49753A23CC371 
               
               
                 30 
                 4B2BF78602209F2AA3 
                 C5AADAF666D31A1B01 
                 6B7A47C40BC2C740A8 
                 5604F6288789C98634 
               
               
                 31 
                 32E1FF1A1E88C8BB60 
                 FD9DC5BF5A48610DF8 
                 73BF418078F6657F16 
                 5F109BC357B7C39DD0 
               
               
                 32 
                 60798435CDDBF9E154 
                 D6D064A63E4CF8335A 
                 60C5F82E2143320218 
                 2D652B4A9E61814EA3 
               
               
                 33 
                 19AC73562E8C4E7768 
                 EEF883EEFD578325A3 
                 781F066A5277903A59 
                 247146A14E206B52B8 
               
               
                 34 
                 585164830EC082F7AD 
                 CE0A9D1C4D07A5F31B 
                 69CE6A3A0EFD27E603 
                 2F8453E09A0B9E1002 
               
               
                 35 
                 2184941F12172A9991 
                 F63D85AA8E633EE5E2 
                 710B6B807DB67A2642 
                 269039F4B5CA6BF3E6 
               
               
                 36 
                 78A37A70416F5BD915 
                 DFDBF14C118D122F41 
                 623B7884252932A4B9 
                 2D30534BCA613416A9 
               
               
                 37 
                 01768AEDA238F3B0D6 
                 E7F316052D69893E47 
                 7AFE793FA99D909CF8 
                 243BC15FE5A0C1F54D 
               
               
                 38 
                 408B9D397D8BC0C813 
                 C71EF70862B9B01700 
                 6B30EA900AE8D8BF5D 
                 2FCED3E031F4D4B008 
               
               
                 39 
                 395E6A5B612388A1D0 
                 FF3610415E22D4FE06 
                 73EA132B865C6578E3 
                 26DAB9F5E1CAC153EC 
               
               
                 40 
                 696DEE21E21A13FD4F 
                 D4311C0C3A591895FB 
                 608F782F754398A5ED 
                 2D7AFE1FCA618143F6 
               
               
                 41 
                 10A7E6BDFEB2446B73 
                 EC19FCBAF9427C7B02 
                 7855866B06772565AC 
                 246E940A1A2074A7ED 
               
               
                 42 
                 515AF168DEFE88EC49 
                 CCEBE5B7B6EDBAAA45 
                 6984EDC4A50272BE09 
                 2F9B814A31F47E1AA8 
               
               
                 43 
                 288F01F4C2293F7D8A 
                 F4C305008A76C1BB43 
                 715E147ED636CF7E48 
                 2690135E1E4A74014C 
               
               
                 44 
                 71B710646EAEB1C2F1 
                 DD25761815E7128E1F 
                 6271FF7B712987FCB3 
                 2D3079E09E612BE403 
               
               
                 45 
                 087D18F98D86F9AB32 
                 E5126EAF297C766719 
                 7AB4FEC0FD9D25C30D 
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                 Idx 
                 S 4   
                 S 5   
                 S 6   
                 S 7   
               
               
                   
               
               
                 0 
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     In an exemplary implementation, the number of cell IDs used may be equal to ‘768’. However, in case that the number of cell IDs used is less than or is greater than ‘768’, a part or the whole of sequences of Table 1 may be used. 
       FIG. 9  is a graph illustrating a PAPR of an S-SCH signal corresponding to a cell ID at each FFT size according to an exemplary embodiment of the present invention. 
     In  FIG. 9 , a horizontal axis denotes a running index (Idx) constituting a cell ID, and a vertical axis denotes a PAPR of an S-SCH signal corresponding to the running index (Idx). S-SCH signals corresponding to three different cell IDs having the same ‘Idx’ but having different segment IDs (n) have the same PAPR. In the case of a 512-FFT size, the maximum PAPR is equal to 6.27 dB. In the case of a 1024-FFT size, the maximum PAPR is equal to 6.74 dB. In the case of a 2048-FFT size, the maximum PAPR is equal to 7.06 dB. As such, an S-SCH symbol corresponding to a cell ID has a very low PAPR and thus, an exemplary embodiment of the present invention may efficiently boost a transmit power when transmitting the S-SCH symbol. 
     An operation of an exemplary embodiment of the present invention based on the aforementioned description is described below in detail. 
       FIG. 10  is a block diagram illustrating a construction of a transmitter for transmitting an S-SCH in an IEEE 802.16m wireless communication system according to an exemplary embodiment of the present invention. 
     As illustrated in  FIG. 10 , the transmitter includes a sequence generator  1000 ; a modulator  1002 , a subcarrier mapper  1004 , an IFFT operator  1006 , a Cyclic Prefix (CP) adder  1008 , a Digital to Analog Converter (DAC)  1010 , and a Radio Frequency (RF) transmitter  1012 . 
     Referring to  FIG. 10 , the sequence generator  1000  generates a sequence dependent on a cell ID from an upper controller (not shown). For example, the sequence generator  1000  includes a memory table such as Table 1 above, and may acquire a sequence dependent on an input cell ID, from the memory table. For another example, the sequence generator  1000  stores only a sequence dependent on a cell ID corresponding to a BS, and may generate the stored sequence under control of the upper controller (not shown). 
     The modulator  1002  modulates the sequence from the sequence generator  1000  according to a determined modulation scheme. For example, the modulator  1002  modulates the sequence into a power-boosted BPSK signal. 
     The subcarrier mapper  1004  maps the modulated sequence from the modulator  1002  to subcarriers of a subcarrier set corresponding to a segment ID. For example, the subcarrier set may be configured as in  FIG. 5 ,  6 , or  7  described above depending on an FFT size and a segment ID. 
     The IFFT operator  1006  IFFT-operates a signal mapped to subcarriers by the subcarrier mapper  1004  and outputs time domain sample data. The CP adder  1008  adds a guard interval (e.g., a CP) to the sample data from the IFFT operator  1006  and generates an S-SCH signal (or an S-SCH symbol). Here, the IFFT operator  1006  and the CP adder  1008  may be constructed as one OFDM modulator. 
     The DAC  1010  converts the S-SCH symbol from the CP adder  1008  into an analog signal. The RF transmitter  1012  converts the baseband analog signal from the DAC  1010  into an RF signal and transmits the RF signal through an antenna. 
     On the other hand, an MS acquires a cell ID using an S-SCH signal received from a BS. At this time, the MS may acquire the segment ID by measuring a receive power on a per-segment basis, and may acquire a running index (Idx) through sequence detection in a frequency domain from a receive signal of a subcarrier set corresponding to the acquired segment ID. 
       FIG. 11  is a block diagram illustrating a construction of a receiver for receiving an S-SCH in an IEEE 802.16 in wireless communication system according to an exemplary embodiment of the present invention. 
     As illustrated in  FIG. 11 , the receiver includes an RF receiver  1100 , an Analog to Digital Converter (ADC)  1102 , a CP eliminator  1104 , an FFT operator  1106 , a subcarrier extractor  1108 , a demodulator  1110 , and a sequence demodulator  1112 . 
     Referring to  FIG. 11 , the RF receiver  1100  converts an RF signal received from an antenna into a baseband analog signal. The ADC  1102  samples the baseband analog signal from the RF receiver  1100  and converts the sampled analog signal into a digital signal 
     The CP eliminator  1104  eliminates a guard interval that is inserted into the signal from the ADC  1102 . The FFT operator  1106  performs an FFT operation for the signal from which the guard interval is eliminated by the CP eliminator  1104 , thereby outputting a frequency domain signal from a time domain signal. Here, the CP eliminator  1104  and the FFT operator  1106  may be constructed as one OFDM demodulator. 
     The subcarrier extractor  1108  acquires a segment ID by measuring a receive power on a per-segment basis, and extracts only signals of a subcarrier set corresponding to the acquired segment ID, from the frequency domain signal from the FFT operator  1106 . 
     The demodulator  1110  demodulates the signals of the subcarrier set extracted by the subcarrier extractor  1108 , in a method corresponding to a modulation method used in the modulator  1002 . 
     The sequence demodulator  1112  includes the same memory table as Table 1 above, determines a correlation value between a sequence detected by the demodulation of the demodulator  1110  and all sequences of the memory table, and determines a running index (Idx) corresponding to a sequence having the maximum correlation value. Also, the sequence demodulator  1112  outputs a cell ID that, in Equation 2, is determined from the segment ID already acquired and the running index (Idx) determined through the correlation value determination. 
       FIG. 12  is a flow diagram illustrating a procedure for transmitting an S-SCH in an IEEE 802.16m wireless communication system according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 12 , a transmitter (i.e., a BS) generates a sequence dependent on its own cell ID in step  1201 . At this time, the transmitter generates a sequence based on an FFT size and Table 1 above. 
     In step  1203 , the transmitter modulates the sequence. For example, the transmitter may modulate the sequence into a power-boosted BPSK signal. 
     In step  1205 , the transmitter maps the modulated sequence to subcarriers of a subcarrier set corresponding to a segment ID of the cell ID. At this time, the subcarrier set may be configured as shown in  FIG. 5 ,  6 , or  7  depending on an FFT size and a segment ID. 
     In step  1207 , the transmitter OFDM-modulates the subcarrier-mapped sequence and generates an S-SCH signal (i.e., an S-SCH symbol). Here, the OFDM modulation includes an IFFT operation, a CP addition, etc. 
     In step  1209 , the transmitter RF-processes and transmits the generated S-SCH signal to an MS. At this time, the S-SCH signal may be transmitted at the front sub-frame within a frame, and may be transmitted at determined time intervals. 
     Then, the transmitter terminates the procedure. 
       FIG. 13  is a flow diagram illustrating a procedure for receiving an S-SCH in an IEEE 802.16m wireless communication system according to an exemplary embodiment of the present invention 
     Referring to  FIG. 13 , a receiver (i.e., an MS) receives an S-SCH signal from a BS in step  1301 . At this time, the S-SCH signal may be received at the front sub-frame within a frame, and may be received at determined time intervals. 
     In step  1303 , the receiver OFDM-demodulates the received S-SCH signal. Here, the OFDM demodulation includes a CP elimination, an FFT operation, etc. 
     In step  1305 , the receiver acquires a segment ID by measuring a receive power on a per-segment basis, and extracts only signals of a subcarrier set corresponding to the acquired segment ID, from the OFDM-demodulated signal. 
     In step  1307 , the receiver demodulates the extracted signals of the subcarrier set in a method corresponding to a modulation method used in a BS, and detects a sequence. 
     In step  1309 , the receiver determines correlation values between the sequence detected by the demodulation and all sequences of a memory table, and determines a running index (Idx) corresponding to a sequence having the maximum correlation value. 
     In step  1311 , the receiver determines a cell ID through Equation 2 above using the segment ID already acquired and the running index (Idx) determined through the correlation value determination. 
     Then, the receiver terminates the procedure. 
     As described above, exemplary embodiments of the present invention proposes an S-SCH for making cell ID distinguishment possible in an IEEE 802.16m wireless communication system. The exemplary embodiments of the present invention may advantageously support a variety of MSs each supporting different bandwidths because the S-SCH of the exemplary embodiments of the present invention includes sequences having a feature of scalability for a variety of FFT sizes. Also, the exemplary embodiments of the present invention may advantageously support a Femto cell by supporting many cell IDs. 
     While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.