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Bidirectional decision feedback equalization for CDMA system with low spreading factor

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3 Author(s)
Junhui Zhao ; Sch. of Electron. & Inf. Eng., Beijing Jiaotong Univ., Beijing ; Hua Li ; Dongming Wang

In this paper, we propose a new approach to bidirectional decision feedback equalization (Bi-DFE) for CDMA systems with low spreading factor. Bidirectional DFE consists of a traditional DFE in parallel with another DFE operating on the time reversed sequence of the received signals. In order to further improve the performance of the proposed Bi-DFE, some modified techniques are applied as follows, a soft decision feedback equalization structure to eliminate the error propagation, optimized time delay parameter and unbiased estimator to be applied, symbol-level Bi-DFE and adaptive realization to lower the complexity. The results of simulation and analysis show that the performance of the proposed Bi-DFE is better than that of DFE, linear MMSE equalization and standard rake receiver.

Published in:

Advanced Communication Technology, 2009. ICACT 2009. 11th International Conference on  (Volume:03 )

Date of Conference:

15-18 Feb. 2009