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Chip-Level MMSE Equalization for CDMA Downlink

Chip-Level MMSE Equalization for CDMA Downlink
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摘要 This work is focused on the structure design of MMSE linear equalizers in the downlink of CDMA-based multi-user communication systems. Previous work was mostly focused on the performance comparison between ZF and MMSE linear equalizers and the conclusion is that the performance based on MMSE criterion is much better than that based on ZF one. In this paper, we only discuss MMSE equalizer and a new block structure of MMSE linear equalizer is derived from the traditional structure of this kind of equalizer. Furthermore, a block MMSE linear equalizer is improved through using the overlap-save technique. Simulation results shaw that the average performance of improved block MMSE linear equalizers is better than those of the block MMSE equalizers and traditional MMSE equalizers. At the same time, the computation complexity of all these MMSE equalizers is given. It is shown that the comple：rity of proposed block MMSE equalizers is lower than that of the traditional equalizers with optimal delay, D, when the length of the filter in traditional MMSE equalizers equals the block size of block MMSE equalizers. This work is focused on the structure design of MMSE linear equalizers in the downlink of CDMA-based multi-user communication systems. Previous work was mostly focused on the performance comparison between ZF and MMSE linear equalizers and the conclusion is that the performance based on MMSE criterion is much better than that based on ZF one. In this paper, we only discuss MMSE equalizer and a new block structure of MMSE linear equalizer is derived from the traditional structure of this kind of equalizer. Furthermore, a block MMSE linear equalizer is improved through using the overlap-save technique. Simulation results shaw that the average performance of improved block MMSE linear equalizers is better than those of the block MMSE equalizers and traditional MMSE equalizers. At the same time, the computation complexity of all these MMSE equalizers is given. It is shown that the comple：rity of proposed block MMSE equalizers is lower than that of the traditional equalizers with optimal delay, D, when the length of the filter in traditional MMSE equalizers equals the block size of block MMSE equalizers.
作者 ZHANG Yi GU Jian YANG Da-cheng
机构地区 Beijing University of Posts and Telecommunications
出处 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2005年第2期82-86,共5页 中国邮电高校学报（英文版）
关键词 MMSE ZF EQUALIZATION CHIP-LEVEL OVERLAP MMSE ZF equalization chip-level overlap
分类号 TN914.53 [电子电信—通信与信息系统]
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参考文献16

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The Journal of China Universities of Posts and Telecommunications
2005年 第2期

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