Source: https://patents.google.com/patent/US8441918B2/en
Timestamp: 2019-08-18 16:06:08
Document Index: 366681762

Matched Legal Cases: ['Application No. 10', 'Application No. 10183133', 'art 11', 'Application No. 2010', 'Application No. 10183010', 'Application No. 10183010', 'Application No. 10183057', 'Application No. 201010245382', 'art 11']

US8441918B2 - System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design - Google Patents
US8441918B2
US8441918B2 US13/204,238 US201113204238A US8441918B2 US 8441918 B2 US8441918 B2 US 8441918B2 US 201113204238 A US201113204238 A US 201113204238A US 8441918 B2 US8441918 B2 US 8441918B2
US13/204,238
US20120027136A1 (en
2006-10-02 Priority to US11/529,245 priority patent/US8018975B2/en
2011-08-05 Application filed by Apple Inc filed Critical Apple Inc
2011-08-05 Priority to US13/204,238 priority patent/US8441918B2/en
2012-02-02 Publication of US20120027136A1 publication Critical patent/US20120027136A1/en
2012-03-20 Assigned to NORTEL NETWORKS LIMITED reassignment NORTEL NETWORKS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MA, JIANGLEI, JIA, MING, TONG, WEN, ZHU, PEIYING
2012-03-20 Assigned to Rockstar Bidco, LP reassignment Rockstar Bidco, LP ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NORTEL NETWORKS LIMITED
2013-05-14 Publication of US8441918B2 publication Critical patent/US8441918B2/en
2016-12-21 First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27488569&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US8441918(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
This application is a continuation application of U.S. patent application Ser. No. 11/529,245 filed on Oct. 2, 2006, and claims the benefit thereof, which is a divisional application of U.S. Pat. No. 7,548,506, issued on Jun. 16, 2009, and claims the benefit thereof, which claims the benefit of U.S. Provisional Application Nos. 60/329,507, 60/329,510 and 60/329,514, all filed Oct. 17, 2001, all of which are herein incorporated by reference in their entirety.
γ t ⁡ ( n ) = ∑ i = 0 Nheader - 1 ⁢ x ⁡ ( n + i ) · x * ⁡ ( n + i + N header )
n coarse=arg max(|γt(n)|)nε{γ t(n)>γthreshold}
R(l,i)=FFT(x(n(i),l)),n(i)=[n start(i)+Nprefix ,n start(i)+N symbol−1]; l=1, . . . , N FFT;
γ f ( j , k ) ⁡ ( i ) = ∑ m = 0 N SYNC - 1 ⁢ R SYNC ( j , k ) ⁡ ( m , i ) · PN SYNC * ( j ) ⁡ ( m ) , ⁢ i = 0 , … ⁢ , 2 ⁢ N
R(l,i)=R(l,i−1)·e i2π(k−1)/NFFT +x(n start(i)+N prefix)−x(n start(i−1)+N symbol−1)
n fine = argmax ( ∏ j = 1 N Tx ⁢ ∏ l = 1 N R x ⁢  γ f ( j , k ) ⁡ ( i )  )
n fine ⁡ ( k ) = argmax ( ∏ j = 1 N Tx ⁢  γ ( j , k ) ⁡ ( i )  )
max ( ∏ j = 1 N Tx ⁢  γ ( j , j ) ⁡ ( i )  ) > N threshold · 1 2 ⁢ N + 1 · ∑ i = 0 2 ⁢ N ⁢ ∏ j = 1 N Tx ⁢  γ ( j , j ) ⁡ ( i ) 
converting a frequency domain representation of a common sync sequence into a time domain representation;
transmitting the time domain representation twice, preceded by a cyclic prefix of the time domain representation;
wherein the common sync sequence is a complex sequence which is different for each transmit antenna of one transmitter, but which is common for respective transmit antennas of each transmitter within a communications network.
2. The method of claim 1 wherein converting a frequency domain representation of a common sync sequence into a time domain representation comprises mapping the common sync sequence to a set of non-adjacent orthogonal frequency division multiplexing (OFDM) sub-carriers and performing an inverse fast Fourier transform (IFFT).
3. The method of claim 1 wherein the common sync sequence is common to multiple base stations.
4. The method of claim 1 wherein the common sync sequence is transmitted on a common synchronization channel.
multiplexing the frequency domain representation of the common sync sequence with a frequency domain representation of a dedicated pilot channel sequence; and
converting the frequency domain representation of the multiplexed sequences into the time domain representation.
multiplexing the frequency domain representation of the common sync sequence with a frequency domain representation of broadcast channel information; and
converting the frequency domain representation of the multiplexed sequence and information into the time domain representation.
multiplexing the frequency domain representation of the common sync sequence with a frequency domain representation of a dedicated pilot channel sequence and a frequency domain representation of broadcast channel information; and
converting the frequency domain representation of the multiplexed sequences and information into the time domain representation.
convert a frequency domain representation of a common sync sequence into a time domain representation;
transmit the time domain representation twice, preceded by a cyclic prefix of the time domain representation;
9. The network device of claim 8 wherein the processing circuitry configured to convert the frequency domain representation of the common sync sequence into the time domain representation is configured to map the common sync sequence to a set of non-adjacent orthogonal frequency division multiplexing (OFDM) sub-carriers and perform an inverse fast Fourier transform (IFFT).
10. The network device of claim 8 wherein the common sync sequence is common to multiple base stations.
11. The network device of claim 8 wherein the common sync sequence is transmitted on a common synchronization channel.
12. The network device of claim 8, wherein the processing circuitry is further configured to:
multiplex the frequency domain representation of the common sync sequence with a frequency domain representation of a dedicated pilot channel sequence; and
convert the frequency domain representation of the multiplexed sequences into the time domain representation.
13. The network device of claim 8, wherein the processing circuitry is further configured to:
multiplex the frequency domain representation of the common sync sequence with a frequency domain representation of broadcast channel information; and
convert the frequency domain representation of the multiplexed sequence and information into the time domain representation.
14. The network device of claim 8, wherein the processing circuitry is further configured to:
multiplex the frequency domain representation of the common sync sequence with a frequency domain representation of a dedicated pilot channel sequence and a frequency domain representation of broadcast channel information; and
convert the frequency domain representation of the multiplexed sequences and information into the time domain representation.
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