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MIMO-OFDM系统的SAGE-IPSO联合估计检测

DOI: 10.13190/j.jbupt.2014.03.009

Keywords: 信道估计,信号检测,广义空间迭代期望最大化,改进的粒子群优化

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Abstract:

针对多输入多输出-正交频分复用系统中最大似然检测算法难以硬件实现以及传统的信道估计性能较差等缺陷,提出了一种联合估计检测算法.该算法使用离散傅里叶变换-最小二乘(DFT-LS)算法进行信道初估计,利用广义空间迭代期望最大化(SAGE)算法对估计的信道信息进行校正,并结合改进的粒子群优化(IPSO)算法完成对信号的迭代检测,使系统性能得到改善.仿真分析结果表明,算法能以较少的迭代次数估计出信道状态信息和检测数据;在相同误比特率的情况下,性能优于经典检测算法,与理想状态下的最大似然检测算法仅相差1dB左右.

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