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摘要:
多小区联合信道估计(MCJCE)是多小区协作联合处理技术实用化的基础,然而现有MCJCE算法需满足各小区信道功率延迟谱(PDP)相同且已知的条件。针对这一不足基于协作多小区正交频分复(OFDM)系统框架首先探讨在多小区信道PDP存在差异但已知条件下多小区联合信道估计的扩展算法(MCeJCE),进而提出未知该信息条件下多小区联合信道估计的修正算法(MCmJCE),同时为降低算法运算复杂度并获得信道估计最小的均方误差(MSE)。采用梳状导频最优导频设计,推导了以上MCJCE算法的克拉美罗界(CRB)。仿真显示在多小区信道PDP存在差异条件下所提MCeJCE和MCmJCE算法都具有良好MSE性能,而基于以上算法信道估计的空频块码(SFBC)协作联合传输也具有良好误码率(BER)性能。
关键词:
协作多小区; 联合信道估计; 扩展算法; CramerRao界
0引言
4结语
基于协作多小区OFDM系统,本文首先探讨在多小区信道PDP存在差异且已知条件下多小区联合信道估计扩展算法MCeJCE,进而提出未知该信息条件下具有实用意义的修正算法MCmJCE。仿真中注意到当使用CP长度替代多小区精确PDP先验信息时,MCmJCE相比MCeJCE有一定的MSE性能损失,这为本文所提算法的进一步优化提供了空间,也是下一步需研究的重点。
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