상세정보
학술지
Receivers with chip-level decision feedback equalizer for CDMA downlink channels
- 저자
- 최진호, 김성락, Cheng-Chew Lim
- 발행일
- 200401
- 출처
- IEEE Transactions on Wireless Communications, v.3 no.1, pp.300-314
- ISSN
- 1536-1276
- 출판사
- IEEE
- 협약과제
- 01MR5400, W-CDMA 방식 IMT-2000용 다수 사용자 검출 기술 연구, 김성락
- 초록
- For the code division multiple access (CDMA) downlink channel, we investigate the decision feedback equalizer (DFE) at chip-level to effectively suppress multiple-access interference (MAI) when the spreading sequences are orthogonal. The structure of the receiver with the chip-level DFE has been investigated and the minimum mean-square error solution has been derived. Due to the inherent structure of the chip-level DFE, some iterative techniques with hard and soft decisions have been proposed. It is shown that the proposed receivers with the chip-level DFE can provide satisfactory performance. In comparison with the adaptive chip-level linear equalizer, the number of users can be doubled by using adaptive chip-level DFE at a bit-error rate of 10 -3. Throughout the paper, we assume that scrambled orthogonal codes are used for spreading sequences.
- KSP 제안 키워드
- Bit-error-rate(BER), Code division Multiple Access(CDMA), Iterative technique, Minimum Mean Square Error(MMSE), Multiple access interference(MAI), Number of users, Orthogonal code, Soft-decision, decision feedback equalizer, linear equalizer(LE), mean square error(MSE)