APPARATUS AND METHOD FOR SYNCHRONIZING CHANNEL IN W-CDMA COMMUNICATION SYSTEM

PURPOSE: An apparatus for performing synchronizations in an asynchronous code division multiple access(CDMA) communication system is provided to carry out transmissions of synchronous channels and synchronous captures within one period of a spread code in a CDMA communication system, and to perform...

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Hauptverfasser: KANG, HUI WON, MAENG, SEUNG JU, AHN, JAE MIN, MUN, HUI CHAN, LEE, HYEON U, LIM, CHAE MAN, YOON, SUN YEONG
Format: Patent
Sprache:eng ; kor
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Zusammenfassung:PURPOSE: An apparatus for performing synchronizations in an asynchronous code division multiple access(CDMA) communication system is provided to carry out transmissions of synchronous channels and synchronous captures within one period of a spread code in a CDMA communication system, and to perform communication with a synchronous method by using one synchronous channel in the asynchronous CDMA communication system, so as to reduce the number of times of the synchronous channel transmissions to minimize interferences of a forward link and to increase a system capacity. CONSTITUTION: A first synchronous channel is transmitted from a frame boundary or a one-period boundary of a spread code via an L1 chip. A second synchronous channel is transmitted in a location far from an L2 chip, from a time point when a transmission of the first synchronous channel is completed. A spread code used in the second synchronous channel and code groups including base stations correspond to each other by a predetermined regulation. If a terminal detects the second synchronous channel by using a specific spread code, the terminal recognizes a code group in which a corresponding base station is included. An interval 'L2' between the two synchronous channels is transmitted within a coherent time, to perform a coherent demodulation by transmitting the two synchronous channel with a same antenna. The interval 'L2' is assumed as one symbol. The 'L0' is capable of being attached right after the first synchronous channel, and is transmitted. If the terminal attempts a detection for the second synchronous channel, a time interval is permitted by being delayed to detect the second synchronous channel. 비동기 방식의 부호분할다중접속 통신시스템의 기지국의 동기채널 수신장치가, 확산부호의 한주기를 가지는 한 프레임의 시작위치에 대한 동기를 잡기 위한 제1동기코드를 생성하며 프레임 내의 소정 위치에 제1동기코드를 송신하는 제1동기채널송신기와, 해당 기지국을 포함하는 복수의 타기지국들의 그룹에 할당된 특정코드인 제2동기코드를 생성하며 프레임 내의 소정위치와 다른 제2소정위치에 상기 제2동기코드를 송신하는 제2동기채널송신기로 구성된다. 또한 비동기 방식의 부호분할다중접속 통신시스템의 기지국의 동기채널 수신장치가, 프레임 내의 소정 위치에 수신되는 제1동기채널의 코드를 포착하여 확산부호의 한주기를 가지는 프레임의 시작위치에 대한 동기를 잡는 제1동기채널 포착판정기와, 제1동기채널 포착시 구동되며 프레임 내의 소정위치와 다른 제2소정위치에 송신되는 제2동기채널의 코드를 수신하여 해당 기지국이 속한 기지국 그룹을 판정하는 코드그룹을 판정하는 코드그룹 판정기로 구성된다.