Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Performance of Parallel Interference Cancellation with Reverse-Link Synchronous Transmission Technique for DS-CDMA System in Multipath Fading Channels with Imperfect Power Control

불완전 전력 제어와 다중 경로 페이딩 채널에서 DS-CDMA 시스템을 위한 역방향링크 동기식 전송을 채용하는 병렬식 간섭 제거기의 성능

  • Published : 2005.11.01
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Abstract

This paper analyzes the performance for an improved multistage parallel interference cancellation (PIC) technique with a reverse-link synchronous transmission technique (RLSTT) for DS-CDMA system in a frequency-selective Rayleigh fading channel with an imperfect power control scheme. The performance degradation due to power control error (PCE), which is approximated by a log-normally distributed random variable, is estimated as a function of the standard deviation of the PCE. The uncoded bit error performance is evaluated in order to estimate the system capacity. Comparing with the conventional one-stage PIC system, we show achievable gain around $60\%$ by the RLSTT even in the presence of PCE. We conclude that the capacity can be further improved via RLSTT, which alleviates the detrimental effects of the PCE

본 논문에서는 불완전 전력 제어 방식과 주파수 선택적 레일리 페이딩 채널에서 DS-CDMA 시스템을 위한 역방향링크 동기식 전송 방식(Reverse-Link Synchronous Transmission Technique: RLSTT)이 채용된 개선된 다단계 병렬식 간섭 제거기(Parallel Interference Cancellation: PIC)에 대한 성능을 분석한다. 로그 노말 분포의 랜덤 변수로 근사화되는 전력 제어 오차(Power Control Error: PCE)에 의한 성능 열화가 PCE의 표준 편차의 함수로 추정된다. 시스템 수용 용량을 추정하기 위하여 비부호화된 비트 오류 성능을 계산한다. 기존의 단일단계 간섭제거기 시스템과 비교하여 전력 제어 오차가 존재하는 경우에서도 RLSTT를 채용함으로 $60\%$ 정도의 이득을 얻을 수 있음을 보여준다. 즉 결론적으로 RLSTT는 수용용량을 더욱 개선해줄 수 있으며 PCE의 악영향을 감소시켜줄 수 있다.

Keywords

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