| 移动通信中用于高阶调制LDPC码译码器的一种低复杂度盲信噪比估计器 |
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| 引用本文： | 李晋,徐晓健,尤肖虎.移动通信中用于高阶调制LDPC码译码器的一种低复杂度盲信噪比估计器[J].电路与系统学报,2006,11(3):135-138. |
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| 作者姓名： | 李晋 徐晓健 尤肖虎 |
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| 作者单位： | 1. 东南大学,移动通信国家重点实验室,江苏,南京,210096
2. 解放军信息工程大学,通信工程系,河南,郑州,450002 |
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| 基金项目： | 国家自然基金重大项目（60496311） |
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| 摘 要： | 在LDPC（Low Density Parity Check,低密度校验）码软迭代译码器中,需要信道信噪比以生成接收比特先验信息.同时,为了提高频谱利用率,传输符号通常采用高阶调制.本文研究的即是如何从高阶调制符号中估计出信噪比以用于LDPC译码器.本文在只适用于BPSK调制的在线信噪比估计器的基础上,推导得到一种适用于8PSK调制的低复杂度盲信噪比估计算法-8PSKM-BSNRE,这种算法的思路还可被扩展应用于其他高阶调制符号.计算机仿真结果证明,8PSKM-BSNRE在应用于LDPC码译码器时具有较好的性能.
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| 关 键 词： | 移动通信 低密度校验码 信噪比估计器 高阶调制 |
| 文章编号： | 1007-0249（2006）03-0135-04 |
| 收稿时间： | 2004-06-21 |
| 修稿时间： | 2004-08-02 |
A low complexity blind SNR estimator in decoder of high-order modulated LDPC code in mobile communication |
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| LI Jin,XU Xiao-jian,YOU Xiao-hu.A low complexity blind SNR estimator in decoder of high-order modulated LDPC code in mobile communication[J].Journal of Circuits and Systems,2006,11(3):135-138. |
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| Authors: | LI Jin XU Xiao-jian YOU Xiao-hu |
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| Abstract: | SNR (Signal-to-Noise Ratio) should be estimated in the decoder of LDPC (Low Density Parity Check) code to generate a prior information of the received symbols. In addition, the symbols are often high-order modulated for high spectrum efficiency. In this paper, we study how to estimate SNR from the received symbols that had been high-order modulated, and present a low complexity blind SNR estimator for 8PSK modulated signals, named 8PSKM-BSNRE algorithm. The idea of this algorithm also can be extended for other high-order modulation. Simulation results prove that 8PSKM-BSNRE has good performance when be used in the decoder of LDPC code. |
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| Keywords: | mobile communication LDPC code SNR estimator high order modulation |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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