| 使用软判决反馈的迭代信道估计方法在CDMA系统中研究 |
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| 引用本文： | 赵军辉,叶蓁蓁,赵春明,尤肖虎. 使用软判决反馈的迭代信道估计方法在CDMA系统中研究[J]. 东南大学学报(自然科学版), 2003, 33(1): 1-4 |
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| 作者姓名： | 赵军辉 叶蓁蓁 赵春明 尤肖虎 |
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| 作者单位： | 东南大学移动通信国家重点实验室,南京,210096 |
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| 基金项目： | 国家 8 6 3计划资助项目 ( 86 3 317 0 3 0 1 0 2 0 4 2 0 /MIIC3G 0 2 0 4 0 0 2 )，东南大学通信技术公司资助项目 |
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| 摘 要： | 首先介绍了基于CDMA2000系统中Rake接收机的信道估计方法，然后将Turbo原理引入信道估计，针对CDMA系统提出了2种迭代信道估计方法，通过使用Rake接收机或解码之后的软信息来改善整个CDMA系统的性能，对CDMA系统中联合运用信道估计与解码技术进行了研究，由于联合信道估计与解码技术可以利用通道系统不同模块之间的“软信息”交换，从而有效提高信道估计准确程度和解码器的性能，仿真结果表明，利用解码之后的软信息来修正信道估计的方法较传统的Rake接收机中的信道估计方法性能有较大改善，在误码率为10^-3左右时，可以提高大约2dB。
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| 关 键 词： | 迭代信道估计 CDMA 软判决反馈 码分多址移动通信 无线通信 |
| 文章编号： | 1001-0505(2003)01-0001-04 |
| 修稿时间： | 2002-07-31 |
Iterative channel estimation using soft decision feedback in CDMA system |
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| Zhao Junhui Ye Zhenzhen Zhao Chunming You Xiaohu. Iterative channel estimation using soft decision feedback in CDMA system[J]. Journal of Southeast University(Natural Science Edition), 2003, 33(1): 1-4 |
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| Authors: | Zhao Junhui Ye Zhenzhen Zhao Chunming You Xiaohu |
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| Abstract: | The channel estimation in Rake receiver is introduced based on CDMA2000 system and then the Turbo principle i s applied to channel estimation. Two iterative channel estimation schemes with soft decision feedback for CDMA system are presented. Joint channel estimation and soft output from Rake receiver and decoder method are also discussed in this paper. Joint channel estimation and decoder technique effectively improve the performance of channel estimation and decoder by taking advantage of information exchange between different units in a communication system. These two schemes can remarkably improve the performance of CDMA system by using soft information after Rake receiver or decoder. The simulation result shows that the improvement of the bit error rate over non iterative scheme is about 2?dB when bit error ration equals 10 -3 (decoder feedback). |
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| Keywords: | CDMA channel estimation soft decision feedback |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
