baber/WOPTO huggingface dataset:
Patent KR-20010089455-A (KR)
IPC: C08F4/659
Filed: 2000-09-14
Abstract: 본 발명은 (a) 주기율표 제 8 내지 10족의 전이 금속 착체, (b) 점토, 점토 광물 또는 이온 교환성 층상 화합물 및 (c) 아민 화합물 또는 그의 브뢴스테드산 부가체로 이루어진 α-올레핀 제조용 촉매; (a) 주기율표 제 4 내지 6족의 전이 금속 킬레이트 착체 또는 주기율표 제 8 내지 10족의 전이 금속 착체, (b) 점토, 점토 광물 또는 이온 교환성 층상 화합물 및 (c) 4급 암모늄 염으로 이루어진 올레핀 중합 촉매; (a) 점토, 점토 광물 및 이온 교환성 층상 화합물, (b) 아민 화합물, 그의 브뢴스테드산 부가체 또는 4급 암모늄 염 및 (c) 유기 실란 화합물을 접촉시켜 수득된 비닐 화합물 중합용 조촉매 성분과 (d) 주기율표 제 4 내지 6족의 전이 금속 착체 또는 주기율표 제 8 내지 10족의 전이 금속 착체를 함유하는 비닐 화합물 중합용 촉매를 제공한다.  상기 촉매는 에틸렌의 올리고머화 활성이 높고, 효율적이면서 저렴하게 에틸렌으로부터 α-올레핀의 제조를 수행할 수 있다.  또한, 분자량이 10,000 이하이고 말단에 비닐 기를 갖는 직쇄상 α-올레핀(올리고머) 또는 분자량이 10,000을 초과하는 폴리올레핀을 효율적이면서 저렴하게 제조할 수 있다.
Patent KR-20010110344-A (KR)
Title: 양방향 실시간 광고 시스템
IPC: H04M3/487
Filed: 2000-01-20
Abstract: 인식성이 높고 상당히 효율적인 광고 매체가 휴대용 터미널들을 사용하여 제공된다. 전자 메일 데이터(106)는 PHS 네트워크(12)를 통하여 송신기의 터미널(16A)로부터 수신기의 터미널(16B)로 전달된다. 중계 장치(22)는 광고 데이터(108)를 전자 메일 데이터(106)에 부가하고, 부가된 광고 데이터(108)를 포함하는 전자 메일 데이터(110)를 생성하고, 전자 메일 데이터(110)를 수신기의 터미널(16B)과 송신기의 터미널(16A)로 전달한다. 각각의 수신기의 터미널(16B)과 송신기의 터미널(16A)은 전자 메일 메시지(120)와 광고 메시지(122)를 동시에 자신의 디스플레이 유닛상에 디스플레이한다.
Patent KR-20010093287-A (KR)
IPC: H04W52/40
Filed: 2000-11-10
Abstract: CDMA 변조 유형을 사용하여, 무선 셀룰러 시스템의 현재 기지국과의 순방향 및 역방향 링크로부터 일반적으로 새로운 기지국과의 새로운 순방향 및 역방향 링크로의 이동국의 내부 주파수 핸드오버에 대한 방법에 있어서, 중단된 호출은 핸드오버 동안 확산 인자를 증가시킴으로써 실질적으로 제거된다. 따라서, 핸드오버 명령은 현재 기지국으로부터 이동국으로 송신되는데, 상기 이동국은, 새로운 동작 주파수와, 최종 확산 인자와, 최종 확산 인자의 적어도 2배인, 바람직하게는 적어도 4배인 시작 확산 인자를 식별한다. 이동국은 식별된 새로운 동작 주파수에 따라 동작 주파수를 스위칭하고, 새로운 동작 주파수 및 식별된 시작 확산 인자에서 이동국으로부터 새로운 기지국과 새로운 순방향 및 역방향 링크를 설립한다. 그 다음에, 이동국은, 핸드오버가 완료되었는지와 검출된 프레임의 프레임 수를 새로운 기지국으로 신호 발신한다. 새로운 기지국 및 이동국은, 이러한 프레임 수 이후에 미리 결정된 수의 프레임을 최종 확산 인자로 스위칭한다.
Patent KR-20020011366-A (KR)
Title: Method and apparatus for automated reconfiguration of an electric power distribution system with enhanced protection
IPC: H02H3/00
Filed: 2000-02-11
Abstract: A system for automated reconfiguration of a distribution system comprises a first plurality of switches (204) located in the distribution system. A first plurality of switch controllers (200; 903A, 903B) controls respective switches (204) in the first plurality of switches and includes resources (208, 212) which monitor the distribution system. Said switch controllers (200; 903A, 903B) communicate information with at least one other switch controller (200; 903A, 903B) in the first plurality of switch controllers and control operation of their respective switches (204) to perform fault isolation or reconfiguration based on the detection of conditions requiring fault isolation and the communicated information. At least one of the switch controllers (903A) also communicates with at least one external device (903C) external to the first plurality of switch controllers to obtain additional information about the condition of the system that is used to control reconfiguration.
Patent KR-20020010896-A (KR)
IPC: A61B17/34
Filed: 2001-01-26
Abstract: 본 발명은 사용자가 절개부를 바디 루멘에 안전하게 생성하기 위한 개량된 혈관 절개 장치(14) 및 방법에 관한 것이다.  본 발명은 상승하는 대동맥의 후방 벽과 같은 바디 구조를 생성하는 장치를 제공한다.  절개 장치(14)는 액츄에이터(42)에 의해 작동되는 블레이드(40)와 같은 외과 소자를 포함한다.  액츄에이터(42)가 완화될 때, 블레이드(40)는 보호되고 수축 위치로부터 노출되고 전개 위치까지 이동된다.  노출된 블레이드(40)는 절개부를 생성하기 위해 상승하는 대동맥의 전방 벽으로 눌린다.  액츄에이터(42)가 더 완화될 때, 블레이드(40)는 수축 위치로 자동적으로 이동되어서 블레이드(40)가 대동맥의 후방 벽을 절개하는 것을 방지한다.
Patent KR-20020028868-A (KR)
Title: 스토퍼
IPC: A61J1/14
Filed: 2000-03-28
Abstract: 동심원부(7)를 갖는 탄성 소재로 이루어지는 단일 부품으로 구성되며, 그 축 두께가 찢어지는 동안에 규정된 파손선(breakage line)을 형성하도록 방사상으로 배치된 컷(cuts)을 갖는 막 두께만큼 줄어든 병 속에 저장된 활성 제품의 현탁액(suspensions) 또는 용액(solution)을 사용하기 위해 준비하는 시스템 내의 병 폐쇄용 탄성 스토퍼이다.
Patent KR-20020015032-A (KR)
Title: 액정 디바이스용 도펀트
IPC: G02F1/13
Filed: 2000-03-29
Abstract: 저압 및 조율가능한 소거 온도의 액정 디바이스용, 고유전성의 무색 또는 실질적으로 무색의 도펀트.  이들 도펀트 화합물은 극성 및 비극성 액정(LC) 혼합물의 작동 전압을 줄이는데 도움을 준다.  이들 도펀트 화합물을 제조 및 이용하는 방법이 개시되어 있다.
Patent KR-20020067617-A (KR)
Title: 백신
IPC: A61K39/245
Filed: 2000-04-04
Abstract: 본 발명은 백신에 사용되기에 적합한 애주번트 조성물에 관한 것이다.  특히, 본 발명의 애주번트 조성물은 사포닌 및 면역자극성 올리고누클레오티드와 임의로 담체를 포함한다.  또한, 본 발명은 본 발명의 애주번트 및 항원을 포함하는 백신을 제공한다.  추가로, 본 발명의 애주번트 및 백신의 제조 방법 및 이들의 약제로서의 용도가 제공된다.  또한, 본 발명의 백신을 투여하므로써 질병에 걸리기 쉽거나 앓고 있는 개인을 치료하는 방법이 제공된다.
Patent KR-20010112953-A (KR)
Title: Preparation containing cell extracts for cell-free protein synthesis and means for synthesizing cell-free protein
IPC: C12P21/02
Filed: 1999-07-29
Abstract: Disclosed are a preparation containing cell extracts for cell-free protein synthesis, prepared by excluding from a living organism a system, participating to inhibiting of self protein synthesis reaction, an apparatus for cell-free protein synthesis reaction equipped with a reaction tank for cell-free protein synthesis, and a kit for use therefor; the preparation can be stored at room temperature and prepared as a preparation in a state where biological functions of the cell extracts are maintained and further, disclosed is means for cell-free protein synthesis comprising cell extracts from which an inhibitor for self protein synthesis reaction is substantially excluded, having introduced therein treatment selected from supplement, storage, exchange or discharge with respect to an element selected from at least mRNA serving as a template for synthesis reaction, an energy reproduction system enzyme, a substrate, and an energy source.
Patent KR-20020033447-A (KR)
IPC: G02F1/15
Filed: 2001-05-21
Abstract: EC 미러의 외부리드 전극으로 사용되는 도전성 금속클립은 U-형태의 단면을 가지고 있다. 도전성 박막의 면에 배치된 상기 클립의 마주보는 측편중 하나는 평면형상으로 형성되어 있다. 글래스 기판의 면에 배치된 다른 일 측편은 만곡형태로 설계되고 외부로 둥글게 개방된 단자를 가지고 있다. 이 측편의 중심 부분은 개구가 좁아지도록 볼록형태으로 형성되어 있다. 이러한 디자인에 따라, 밀봉수지가 팽창되더라도, 외부리드 전극부분 및 상기 클립사이에 접속불량의 발생이 방지된다. 더욱이, 상기 클립을 상기 기판에 부착시키는 작업성이 양호하게 된다. 더욱이, 상기 외부리드 전극은 손상을 입지 않게 된다. 
     부가적으로, 상기 클립이 상기 기판상에 끼워질 때 변형되지 않게 된다.
Patent KR-20030009044-A (KR)
IPC: H02P6/06
Filed: 2001-03-23
Abstract: 구성규모의 증대를 억제한 1대의 장치에서, 상위 시스템으로부터의 명령 또는 사용 어플리케이션의 종류에 따라서, 최적인 구동방식 또는 구동특성으로 스핀들모터를 구동할 수 있는 스핀들모터 구동방법, 스핀들모터 구동회로, 자기디스크 구동방법 및 자기디스크 장치를 제공한다. 상위 시스템(10)으로부터의 명령에 따라서, 스핀들모터 구동회로(1)내의 구동방식 전환수단(2)으로, 스핀들모터(9)를 펄스폭변조 구동수단(5)에 의한 펄스폭변조 구동방식으로 구동할 것인지, 선형 구동수단(6)에 의한 선형 구동방식으로 구동할 것인지를 전환함으로써, 1개의 스핀들모터 구동회로(1)에서 사용 용도에 적합한 구동방식으로의 구동을 가능하게 한다.
Patent KR-20030061195-A (KR)
Title: Control circuit for audio signal amplification
Inventor: KWON YEONG HYEON
IPC: H03G3/00
Filed: 2002-01-11
Abstract: PURPOSE: An audio signal amplification control circuit is provided to improve the reliability by amplifying selectively an inputted audio signal to prevent the distortion of sound. CONSTITUTION: An audio signal amplification control circuit includes a signal decision portion(110), an audio amplification process portion(120). The signal decision portion compares an inputted audio signal with a reference voltage signal. The audio amplification process portion amplifies the inputted audio signal if an output of the inputted audio signal is less than the output of the reference voltage signal or outputs the inputted audio signal if the output of the inputted audio signal is more than the output of the reference voltage signal. The audio amplification process portion includes an amplification portion(121) for amplifying the inputted audio signal and a switching portion(122) for outputting one of input terminals according to a result of the signal decision portion.
Patent KR-20030062864-A (KR)
Title: Client device of thin client network system and method of controlling the same
Inventor: PARK JIN YEOL
IPC: G10L11/00
Filed: 2002-01-21
Abstract: PURPOSE: A client device of a thin client network system and a method for controlling the same are provided to supply a volume adjusting function. CONSTITUTION: A client device(10) of thin client network system is connected to a server(3) having a plurality of application programs through a network(1), requests an operation of the application program, and displays an operation result of the application program as graphic information. A speaker(20) outputs sound data being supplied from the server(3). A volume selection unit sets a volume output of a user. A volume control unit sets a volume output of sound data supplied from the server(3) as the volume output set through the volume selection unit, and executes an output through the speaker(20). The volume selection unit includes a keyboard(16) for requesting an operation of the application program to the server(3) and a keyboard driver(30) for transmitting a combination key signal to the volume control unit in the case that a key input signal selected through the keyboard(16) is the combination key signal made by a combination of keys for adjusting the volume output. The volume control unit adjusts a volume output of a sound being output to the speaker(20) in accordance with the combination key signal from the keyboard driver(30).
Patent KR-20030067193-A (KR)
Title: Internet phone and method for recharging and settling card using that
Inventor: LEE YEONG JIN
IPC: G06F1/18
Filed: 2002-02-07
Abstract: PURPOSE: An Internet phone and a method for charging and settling a card using the same are provided to manage and charge the card conveniently by making the user charge a transportation card and perform the settlement of a pass-card through the Internet phone. CONSTITUTION: A card reader(40) reads the IC information including the card use information stored in the card and outputs the read information to a CPU(50). A fare charger(90) stores the charging price data of a transportation charging company received through a network connector(80) under the control of the CPU(50). A memory(60) stores the information including the list information of each bank and the address information of each bank server. The CPU(50) determines the settlement information such as an account number and the price from an output signal of the card reader(40), and connects to the bank server through the network connector(80) by reading the bank server address if a connection request is received from the card reader(40).
Patent KR-20020067009-A (KR)
Inventor: KATSUTANI MASAFUMI
IPC: G09F9/00
Filed: 2002-02-09
Abstract: PURPOSE: To arrange wirings which are not connected to LSI (large scale integration) chips for drive shortest without interruption in structure in which plural LSI chips for drive are mounted in a liquid crystal panel or the like. CONSTITUTION: This liquid crystal 1 has plural data line electrodes and plural scanning line electrodes which intersect with each other and which form a matrix shaped pixel part at their intersection parts. A mounting package 21 is connected to the end edge part of the side of one side in the glass substrate 1a of the liquid crystal panel 1. An LSI chip 24 driving the data line electrodes and an LSI chip 23 driving the scanning line electrodes are mounted in order from a side closed to the panel 1 on an insulating film-based material 22 in the mounting package 21. Then, a wiring part 28b consisting of plural wirings connecting a connection terminal group 27 and the LSI chip 24 is arranged by being fixed on the film-based material 22 so as to pass the downward of the LSI chip 23 existing on the film-based material 22.
Patent KR-20020071728-A (KR)
Inventor: ALBRICH REINHARD
IPC: B61B7/00
Filed: 2002-02-22
Abstract: PURPOSE: A transport installation for carrying passengers from higher station towards lower station is provided to reduce load applying to a guide rail by a small size of the guide rail. CONSTITUTION: A transport installation for carrying passengers from higher station towards lower station includes a guide rail(2) is fastened on a supporting cable(3) at a distance on the ground. The guide rail is formed of a multiplicity of sub-rails(21) and carriages and a chair or a cabin is transferred along the rail. The sub-rails are connected each other to move the chair and the cabin in the longitudinal direction of the guide rail.
Patent KR-20030073404-A (KR)
Title: Semiconductor device having capacitors and method of fabricating the same
Inventor: JUNG HUN
IPC: H01L27/108
Filed: 2002-03-11
Abstract: PURPOSE: A semiconductor device with a capacitor is provided to prevent a bridge caused by upper sidewalls of adjacent storage nodes by making the width of the upper sidewalls of cylindrical storage nodes smaller than that of the lower sidewalls of the storage nodes. CONSTITUTION: A semiconductor substrate(101) is prepared. A lower storage node(107a) is formed on a predetermined region of the semiconductor substrate. A cylindrical sidewall storage node(110b) extends toward the upper portion of the lower storage node, contacting the edge of the lower storage node. The lower storage node and the sidewall storage node constitutes a storage node(130a) wherein the sidewall storage node has a slanting profile in which the upper diameter of the sidewall storage node is smaller than that of the lower diameter of the sidewall storage node.
Patent KR-20020082752-A (KR)
Inventor: IIDA TAKASHI
IPC: B60R21/26
Filed: 2002-04-03
Abstract: PURPOSE: To provide a connector for a squib, which can cope with the demands for downsizing and space-saving appropriately, and provide a connector for a squib and its parts, wherein no problem such as workability reduction is caused during assembly. CONSTITUTION: In the connector 1 for the squib ignited by supplying current to a gas generator, having the first constituting element 2 to support a male electric connector element 10, the second constituting element 3 to support a female electric connector element 20 engaged with the male electric connector element 10, and a short-circuit element 4 switchable between a short-circuit position where the male electric connector element 10 is electrically short- circuited and a non-short circuit position, a flat-plate noise filter 5 having an electromagnetic wave absorbing material is penetrated by the male electric connector element 10, and arranged between the first constituting element 2 and the short-circuit element 4 so as to surround the circumference of the male electric connector element 10.
Patent KR-20030080881-A (KR)
Title: the roaster
Inventor: LEE WON SIK
IPC: A47J37/06
Filed: 2002-04-11
Abstract: PURPOSE: A meat roaster is provided to conveniently and uniformly roast meat by using a rotary grill. CONSTITUTION: A meat roaster is composed of a case(1), a plurality of rotary grills(4) rotatably installed within the case and having a foldable upper plate(6) and a lower plate(5), handles(9) installed at the upper plate and the lower plate, locking pieces(11a,11b) attached to the upper plate and the lower plate and fixing the rotary grill in folded state, shaft rods(10) fixed to one side of the upper plate and the lower plate, and a driven shaft coupled with the shaft rod. The driven shaft is fixed to a driven gear(15) rotated by a driving gear(14), and transmits rotary power to the rotary grill.
Patent KR-20020082155-A (KR)
Inventor: OMI TOSHIHIKO
IPC: H04N5/357
Filed: 2002-04-23
Abstract: PURPOSE: To provide an optical sensor in which the variation of the sensitivity of pixels for each pixel is suppressed. CONSTITUTION: The optical sensor composed of a semiconductor photoreceptor element has an area, in which an impurity having a polarity which is different from that of a semiconductor substrate is diffused in its scribe. By causing the potential at the area where the impurity is diffused to float, the charges generated by the light made incident to the scribe of the sensor can be stored efficiently in the P-N junction, constituted of the area containing the diffused dopant and semiconductor substrate. Consequently, the charges generated by the light made incident to the scribe will not reach the P-N junctions which constitute the pixels of the sensor.
Patent KR-20030085931-A (KR)
Title: Method of forming a capacitor on semiconductor devices
Inventor: PARK SEONG HUI
IPC: H01L27/04
Filed: 2002-05-02
Abstract: PURPOSE: A method for forming a semiconductor capacitor is provided to be capable of simplifying processes by forming an analog capacitor of ONO(Oxide/Nitride/Oxide) structure using a single poly. CONSTITUTION: A gate oxide layer(102) is formed on a semiconductor substrate(100), and a poly layer is deposited on the gate oxide layer. After forming a poly oxide layer on the poly layer, a capacitor pattern is formed by selectively etching the poly oxide layer and poly patterns(104a,104b) are formed by wet-etching. The poly oxide layer is removed by etch-back. A thermal oxide layer(110) is formed on the poly pattern(104a,104b). A nitride layer(112) is formed on the thermal oxide layer. By plugging the nitride layer(112), a capacitor of ONO structure is formed.
Patent KR-20030087314-A (KR)
Title: Method for dispersing service member in mobile communication system and apparatus for preforming the same
Inventor: KANG SIN HYEOK
IPC: H04B7/26
Filed: 2002-05-08
Abstract: PURPOSE: A method and system for dispersing mobile subscribers in a mobile system is provided to distribute CDMA2000-1x terminals to an IS-95A/B system by executing a superset hash function. CONSTITUTION: A mobile system comprises the first to Nth CDMA2000-1x terminals(100-1-100-N) and the first to Nth IS-95A/B terminals(110-1-110-N) within the service area of a base station(120). The base station(120) comprises a CDMA2000-1x system(122) to provide services to the first to Nth CDMA2000-1x terminals(100-1-100-N) and an IS-95A/B system(124) to provide services to the first to Nth IS-95A/B terminals(110-1-110-N). The base station(120) connects the first to Nth IS-95A/B terminals(110-1-110-N) to the CDMA2000-1x system(122) so that the IS-95A/B terminals(110-1-110-N) can be provided services by the CDMA2000-1x system(122). Also the base station(120) connects the first to Nth CDMA2000-1x terminals(100-1-100-N) to the IS-95A/B system(124) so that the CDMA2000-1x terminals(100-1-100-N) can be provided services by the IS-95A/B system(124).
Patent KR-20030087431-A (KR)
Title: The power saving method of sensor for a golf swing analysis equipment
Inventor: SEO SEOK HO
IPC: A63B69/36
Filed: 2002-05-10
Abstract: PURPOSE: A method of saving power of the sensors of golf-swing analysis device is provided to minimize the consumption of power of the sensors by switching on and off an array of multiple-infrared ray sensors. CONSTITUTION: The method of saving power of the sensors of golf-swing analysis device includes a power supply unit which supplies the device with power; an infrared ray sensor unit which senses the movements of a golf club; a controlling unit which handles signals and data from the infrared sensor; and a display unit which displays the results of the controlling unit. The method comprises the first step to supply power with the infrared ray sensors by means of the power supply unit(s10); the second step to switch on and off the sensors in accordance with the club head coming into and coming out from the infrared sensors(s20); the third step to switch off the sensor and switch on an array of the sensors by sensing the club head incoming into the infrared sensor unit by a golfer's forward swing(s30); and the fourth step to switch on and off the array of sensors in regular sequence, equipped in the infrared sensor unit, by a golfer's forward swing(s40).
Patent KR-20030088683-A (KR)
Title: A blood sugar test device using a wireless phone and a method to transmit the blood sugar level to internet server
Inventor: KIM MUN SU
IPC: G16H10/60
Filed: 2002-05-14
Abstract: PURPOSE: A blood sugar measuring device using a mobile communication terminal and a method for transmitting measured value to a server on the Internet are provided to automatically transmit measured results on blood sugar of the mobile communication terminal to a blood sugar managing server on the Internet, thereby enabling a doctor to observe the measured results in real time. CONSTITUTION: A strip connector(270) inserts a strip stained with blood thereto for blood sugar measurement. A sensor(260) measures a residual amount of blood existing on the strip. A temperature measurer(280) measures temperature at blood sugar measurement. A signal converter(250) converts the residual amount received from the sensor(260) into a blood sugar level in reference to the measured temperature. A wireless unit(210) wirelessly communicates with a mobile communication base station, and transmits the measured blood sugar level to a blood sugar managing server on the Internet. A display(220) displays the measured blood sugar level. An input unit(240) is used for user interface. A CPU(230) transmits the received blood sugar level to the display(220) and the wireless unit(210).
Patent KR-20030088695-A (KR)
Title: A controller for a power saving multi-tap
Inventor: KIM MAN GAP
IPC: H01R13/66
Filed: 2002-05-14
Abstract: PURPOSE: A control circuit of a power-saving multi-tap is provided to save power by cutting off power supply applied to a sub-tap when a main system is not being used. CONSTITUTION: A voltage detector(21) detects micro-voltage provided to a main system through a main outlet by using a transformer. An amplifier(22) receives voltages detected by the voltage detector for amplifying micro-voltage for obtaining delay time. An action delay unit(23) delays the voltage transmitted by the amplifier from being transmitted to a rear end through a time constant to protect a circuit from lightning. A relay driver(24) is switched according to a volume of the voltage provided via the action delay unit for driving a relay connected with a sub-outlet.
Patent KR-20030088995-A (KR)
Title: Noise blocking structure of surface acoustic wave filter
Inventor: LEE SEUNG GI
IPC: H03H9/64
Filed: 2002-05-15
Abstract: PURPOSE: A noise eliminating structure of a SAW(Surface Acoustic Wave) filter is provided to prevent the noise generated upon filtering signals by increasing area from a cross region of fingers to a region of a ground electrode. CONSTITUTION: An input electrode(42) is comprised of a signal electrode(42a) and a ground electrode(42b). The signal electrode(42a) and the ground electrode(42b) are disposed in parallel on a piezoelectric substrate(30). An input IDT(InterDigital Transducer)(40) is comprised of a plurality of input fingers(41). An output electrode(52) is comprised of signal and ground electrodes(52a,52b), which are disposed in parallel with the input IDT(40). An output IDT(50) is comprised of a plurality of output fingers(51). The input fingers(41) of the input IDT(40) are crossed to form a predetermined pattern. An area(43b) from the cross region of the input fingers(41) to the ground electrode(42b) is greater than an area(43a) from the cross region to the signal electrode(42a).
Patent KR-20030090389-A (KR)
Title: Method for acqusition of frequency offset synchronous in wireless local area network which is using orthogonal frequency division multiplexing
Inventor: CHUN JIN HUI
IPC: H04J11/00
Filed: 2002-05-23
Abstract: PURPOSE: A method for synchronizing a frequency offset of a wireless LAN system using an OFDM(Orthogonal Frequency Division Multiplexing) method is provided to correct a phase within a short time by performing the first and the second phase error correction processes using a shot training sequence and a long training sequence. CONSTITUTION: A conjugating process is performed between short training sequences adjacent to a received preamble. A hexa value is decided by comparing a real number part and an imaginary number part to a stored value of a lookup table(30). A cosine value and a sine value are decided by comparing the hexa value to a value of the first NCO(Numerical Controlled Oscillator) table(41). A phase is corrected by applying the cosine value and the sine value to two long training sequences of the preamble. A phase offset is obtained by using the conjugate between the corrected long training sequences and the hexa value is added thereto. The cosine value and the sine vale are decided by comparing the added value to the value of the second NCO table(42). The phase is corrected by applying the cosine and the sine values to a received signal.