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MMSE-DFE (Minimum Mean Square Error-Decision Feedback Equalization) is a sliding-window decision feedback equalization method. This paper first applies MMSE-DFE into joint detection algorithm for TDD-CDMA (Time Division Duplex-Code Division Multiple Access). It has the low complexity compared with MMSE-BDFE (Minimum Mean Square Error-Block Decision Feedback Equalization) based joint detection. MMSE-IC (Minimum Mean Square Error-Interference Cancellation) is an efficient detection algorithm in V-BLAST. To adopt the advantages of MMSE-IC, we introduce the interference cancellation into the MMSE-DFE based joint detection. By the aid of interference cancellation, the performance of the MMSE-DFE based joint detection is improved. The experiments show that the performance of the proposed joint detection algorithm has the better performance than the conventional MMSE-BDFE based joint detection.

This paper describes the implementation and optimization of TD-SCDMA joint detection and decoding, including channel re-estimation algorithm, soft de-rate-matching algorithm. The proposed algorithms can improve the performance, especially when the interference is great. The proposed algorithms can be applied in not only TD-SCDMA system, but also the evolution of TD-SCDMA, Wireless Local Area Network etc.