| 非理想最大比合并的误码率下界 |
| |
| 引用本文： | 盛彬,尤肖虎.非理想最大比合并的误码率下界[J].东南大学学报,2005,21(4):379-384. |
| |
| 作者姓名： | 盛彬 尤肖虎 |
| |
| 作者单位： | 东南大学移动通信国家重点实验室,南京210096 |
| |
| 摘 要： | 研究了信道估计的均方误差,利用无限长、非因果的维纳滤波器推导出了它的下界.通过对不同衰落信道多普勒谱的积分,求出了相应的信道估计均方误差下界的闭合表达式,并在此基础上得到了分集系统在独立同分布的衰落信道中采用最大比合并时的误码率下界.数值分析结果表明,非理想信道估计下最大比合并的误码率性能是以理想信道估计的结果为下界,并随着最大多普勒频移的增加或信道估计信噪比的减小而逐渐劣化.
|
| 关 键 词： | 下界 误码率 最小均方误差 信道估计 最大比合并 |
| 收稿时间： | 03 1 2005 12:00AM |
Lower bound on BER performance for maximal ratio combining with weighting errors |
| |
| Sheng Bin,You Xiaohu.Lower bound on BER performance for maximal ratio combining with weighting errors[J].Journal of Southeast University(English Edition),2005,21(4):379-384. |
| |
| Authors: | Sheng Bin You Xiaohu |
| |
| Institution: | National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China |
| |
| Abstract: | The theoretical lower bounds on mean squared channel estimation errors for typical fading channels are presented by the infinite-length and non-causal Wiener filter and the exact closed-form expressions of the lower bounds for different channel Doppler spectra are derived.Based on the obtained lower bounds on mean squared channel estimation errors,the limits on bit error rate (BER) for maximal ratio combining (MRC) with Gaussian distributed weighting errors on independent and identically distributed (i.i.d) fading channels are presented.Numerical results show that the BER performances of ideal MRC are the lower bounds on the BER performances of non-ideal MRC and deteriorate as the maximum Doppler frequency increases or the SNR of channel estimate decreases. |
| |
| Keywords: | lower bound bit error rate minimum mean-square error channel estimation maximal ratio combining |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
