CDMA 이동통신에서 인접 기지국의 파일럿 간섭 신호를 제거하는 복조기에 관한 연구

A study on the demodulator of canceling pilot interference signals from neighboring base stations in CDMA mobile communication

  • 전형구 (동의대학교 정보통신공학과) ;
  • 이숭희 (동의대학교 정보통신공학과) ;
  • 장종욱 (동의대학교 정보통신공학과)
  • 발행 : 2003.08.01

초록

인접 기지국의 송신 신호는 단말기에서 볼 때 간섭 신호로 작용한다. 이러한 간섭 신호로 인하여 순방향 링크 용량이 줄어든다. 인접 기지국의 파일럿 간섭 신호를 제거함으로써 BER 성능을 개선할 수 있으며 순방향 링크 용량을 개선할 수 있다. 본 논문에서는 순방향 링크 용량을 개선할 수 있도록 인접 기지국에서 송신하는 파일럿 간섭 신호를 제거할 수 있는 복조기 구조를 제안하였다. 모의 실험 결과 인접 기지국의 파일럿 간섭 신호를 제거할 때 BER = 10-2를 얻기 위한 Eb/No 값이 간섭신호를 제거하지 않을 때에 비하여 3㏈ 감소하였다.

A mobile station in a cell receives interference signals from neighboring base stations. Due to the interference signals, the forward link capacity of the cellular system is reduced. Pilot signal received from a neighboring base station is one of the interference signals. Since the pilot signal is a known signal for all the mobile stations, the pilot interference signal can be cancelled by interference cancellation techniques. In this paper, we propose a demodulator with interference canceller to cancel pilot interference signals received from neighboring base stations. The simulation results show that Eb/No value to obtain BER = 10-2 is lowered by 3㏈ in the propose demodulator.

키워드

참고문헌

  1. CIC2001 Performance of interference cancellation receivers in multi-cell CDMA systems Jonas Karlsson;Hideki Imai
  2. Proceeding of VTC-fall, 2000 Improved single user detector for WCDMA systems based on Griffs algorihm J.Karlsson;H.Imai
  3. Proc. IEEE VTC'2000 Spring v.2 Performance of multi-rate DS-CDMA system with multistage partial parallel interference cancellation S.H.Han;J.H.Lee
  4. Proc.for MC-SS'99 Wideband and narrowband interference cancellation for asynchronous MC-CDMA A.C.MacCormick;P.M.Grant;G.J.R.Povey
  5. Multiuser detection S,Verdu
  6. IEEE Trans.on Communication v.42 no.12 MMSE interference suppress for direct-sequence spread-spectrum CDMA U.Madhow;M.L.Hongig
  7. GLOVECOM '93, Analysis of a DS/CDMA successive interference cancellation scheme using correlations P.R.Patel;J.Holtaman
  8. Electronics letters v.32 no.23 Interference cancellation scheme with simple sturcture and better performance S.R.Kim;J.G.Lee;H.Lee
  9. IEEE Journal of Selected Area in Communications v.12 no.5 Analysis of a simple sucessive interference cancellation scheme in a DS/CDMA system P.Patel;J.Holtzman
  10. WINLAB Workshop Successive interference cancellation in multple Data Rate DS/CDMA systems A.Johansson;A.Svensson
  11. Telecommunication review v.8 no.5 Adaptive user-by-user weighted parallel interferce cancellation for CDMA systems S.R.Kim;I.K.Choi;S.B.Kang
  12. IEEE Tans. on Comm v.42 no.3 Successive interference cacellation for multiuser asynchronous DS/CDMA detectors in multipath fading Links A.L.C.Hui;K.B.Letaief
  13. IEEE Trans. On Veh.Tech. v.40 no.2 on the capacity of a cellular CDMA system K.S.Gilhousem
  14. IS-95 Mobile Station-Base Station compatibility standard for dual-Mode wideband spread spectrum cellular system