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

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Simple Multi-rate Parallel Interference Canceller for the IMT-2000 3GPP System

IMT-2000 3GPP 시스템을 위한 간단한 다중 전송률 병렬형 간섭제거기

  • Published : 2001.12.25
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Abstract

In this paper, we propose an effective but simple multi-rate parallel interference canceller(PIC) for the international mobile telecommunications-2000(IMT-2000) 3rd generation partnership project (3GPP) system. For effective multi-rate processing, we define the basic block as one symbol period of the dedicated physical control channel(DPCCH) having the lowest data rate and common to all users. Then, decision and interference cancellation are performed at every basic block. For an asynchronous channel, we propose an advance removal scheme that removes in advance multiple access interference(MAI) due to the next blockof other users with shorter delay. Introducing a pipeline structure at a sample base, we can implement efficiently the PIC using the advance removal scheme with a minimum hardware and no extra computations. Through computer simulations, we analyze the bit error rate(BER) performance of the proposed PIC with respect to signal-to-noise ratio(SNR) and the number of users.

본 논문에서는 IMT(international mobile telecommunications)-2000 3GPP(3rd generation partnership project) 규격에 따른 전송률이 서로 다른 다수의 사용자 신호들을 효과적으로 처리할 수 있는 간단한 병렬형 간섭제거기를 제안한다. 제안한 방식은 다중 전송률 처리를 위하여 모든 사용자들에 공통적이며 전송률이 가장 낮은 제어채널의 한 심벌을 기준블록으로 설정하여 기준블록 단위마다 병렬로 간섭제거를 수행한다. 또한, 사용자간 비동기 환경에서 자신보다 짧은 지연을 갖는 간섭 사용자의 다음 기준블록에 의하여 발생하는 간섭을 미리 판정하고 재생하여 제거함으로써 간섭제거 성능을 개선할 수 있는 효과적인 사전 제거 기법을 제안한다. 제안된 사전 제거 기법을 사용한 다중 전송률 처리 병렬형 간섭제거기의 효율적인 구현을 위하여 샘플단위의 파이프라인을 도입하여 기준블록 주기로 판정하고, 이어서 샘플단위로 재생성하고 샘플단위로 간섭제거를 수행함으로써 최소의 하드웨어를 필요로 하는 파이프라인 구조를 제안한다. 모의실험을 통하여 저l안한 간섭제거기의 신호 대 잡음비 및 사용자 수에 따른 비트 오류율 성능을 분석한다.

Keywords

References

  1. F. Adachi, M. Sawahashi, and H. Suda, 'Wideband DS-CDMA for next-generation mobile communications system,' IEEE Comm. Mag., vol. 36, pp. 56-69, Sep. 1998 https://doi.org/10.1109/35.714618
  2. P. Chaudhury, W. Mohr and S. Onoe, 'The 3GPP proposal for IMT-2000,' IEEE Comm. Mag., vol. 37, pp. 72-81, Dec. 1999 https://doi.org/10.1109/35.809388
  3. S. Moshavi, 'Multi-user detection for DS-CDMA communications,' IEEE Comm. Mag., vol. 34, pp. 124-136, Oct. 1996 https://doi.org/10.1109/35.544334
  4. M. K. Varanasi and B. Aazhang, 'Multistage detection in asynchronous code-division multiple-access communications,' IEEE Trans. Comm., vol. 38, pp. 509-519, Apr. 1990 https://doi.org/10.1109/26.52662
  5. S. Verdu, Multiuser detection, Cambridge Univ. Press, 1998
  6. R. M. Buehrer, S. P. Nicoloso, and S. Gollamudi, 'Linear versus nonlinear interference concellation,' J. of Comm. Net., vol. 1, no. 2, pp. 118-133, June 1999
  7. A. L. C. Hui and K. B. Letaief, 'Successive interference cancellation for multiuser asynchronous DS/CDMA detectors in multipath fading links,' IEEE Trans. Comm. vol. 46, no. 3, pp. 384-391, Mar. 1998 https://doi.org/10.1109/26.662644
  8. A. L. Johansson, 'Group-wise successive interference cancellation in multirate CDMA systems,' in Proc. IEEE VTC'99, vol. 2, pp. 1435-1439, May 1999 https://doi.org/10.1109/VETEC.1999.780584
  9. S. R. Kim, I. K. Choi, and S. B. Kang, 'Adaptive user-by-user weighted parallel interference cancellation for CDMA systems,' Telecomm. Review, vol. 8, no. 5, pp. 783-789, Sep. 1998
  10. N. S. Correal, R. M. Buehrer, and B. D. Woerner, 'A DSP-based DS-CMDA multiuser receiver employing partial parallel interference cancellation,' in IEEE J. Select. Areas Comm., vol. 17, pp 613-630, Apr. 1999 https://doi.org/10.1109/49.761040
  11. S. H. Han and J. H. Lee, 'Performance of multi-rate DS-CDMA system with multi-stage parallel interference cancellation,' in Proc. IEEE VTC'2000 Spring vol. 2, pp. 254-258, May 2000 https://doi.org/10.1109/VETECS.2000.851228
  12. K. I. Pedersen and P. E. Mogensen, 'Vector groupwise interference cancellation in multi-rate DS-CDMA systems,' in Proc. IEEE VTC'2000 Spring, vol. 2, pp. 750-754, May 2000 https://doi.org/10.1109/VETECS.2000.851225
  13. TS 25.211 v3.3.0, 'Physical channels and mapping of transport channels onto physical channels,' Technical Specification, June 2000
  14. TS 25.213 v3.3.0, 'Spreading and modulation,' Technical Specification, June 2000
  15. TS 25.214 v3.3.0, 'Physical layer procedures (FDD),' Technical Specification, June 2000
  16. J. K. Kim, S. K. Oh, M. H. Sunwoo, and M. S. Jung, 'Multi-rate parallel interference canceller for IMT-2000 3GPP system,' in Proc. IEEE VTC'2001 Spring, vol. 4, pp. 2307-2311, May 2001 https://doi.org/10.1109/VETECS.2001.944012