Low-Complexity Hybrid QRD-MCMC MIMO Detection
Low-Complexity Hybrid QRD-MCMC MIMO Detection
复制标题
低复杂度混合 QRD-MCMC MIMO 检测
DOI：
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发表时间：
2008
期刊：
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通讯作者：
Rong
中科院分区：
文献类型：
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作者：
Ronghui Peng;K. Teo;Jinyun Zhang;Rong
在本文中，我们提出了一种新颖的混合QRD - MCMC MIMO检测器，它结合了QRD - M检测器和马尔可夫链蒙特卡罗（MCMC）检测器的特点。首先应用QRD - M算法来获得发射信号向量的初始估计。随后，QRD - M估计值被用于初始化MCMC检测的吉布斯采样器之一。MCMC检测降低了QRD - M检测器所需的M参数，而QRD - M初始化有效地缓解了现有MCMC检测器中众所周知的高信噪比问题。在具有理想信道边信息（CSI）的理想化MIMO信道以及具有非理想CSI的实际IEEE 802.16e MIMO - OFDMA系统下，对QRD - M / MCMC检测器的性能进行了检验。数值结果表明，与单独的QRD - M或MCMC检测器相比，QRD - MCMC检测器以较低的复杂度实现了更优的性能。
In this paper, we propose a novel hybrid QRD- MCMC MIMO detector that combines the features of a QRD-M detector and a Markov chain Monte Carlo (MCMC) detector. The QRD-M algorithm is applied first to obtain initial estimates of the transmitted signal vector. Subsequently, the QRD-M estimate is used to initialize one of the Gibbs samplers for MCMC detection. The MCMC detection reduces the M parameter required by the QRD-M detector, while the QRD-M initialization effectively alleviates the well-known high-SNR problem in existing MCMC detectors. Performance of the QRD-M/MCMC detector is examined under both an idealized MIMO channel with perfect channel side information (CSI) and a practical IEEE 802.16e MIMO- OFDMA system with imperfect CSI. Numerical results show that, compared to the stand-alone QRD-M or MCMC detectors, the QRD-MCMC detector achieves superior performance at a reduced complexity.