Bidirectional decision feedback equalization for CDMA system with low spreading factor

  • Authors:

  • Junhui Zhao;Hua Li;Dongming Wang

  • Affiliations:

  • School of Electronics and Information Engineering, Beijing Jiaotong University, Beijing and Faculty of Information Technology, Macau University of Science and Technology, Macau, China;School of Information Science and Engineering, Shandong University, Ji'nan, Shandong, China;National Mobile Communication Research Lab, Southeast University, Nanjing, China

  • Venue:
  • ICACT'09 Proceedings of the 11th international conference on Advanced Communication Technology - Volume 3
  • Year:
  • 2009

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Abstract

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.