A Simplified Unbiased MMSE Metric Based QRDM Decoder for MIMO Systems
A Simplified Unbiased MMSE Metric Based QRDM Decoder for MIMO Systems
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DOI：
10.1109/wicom.2010.5600982
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发表时间：
2010-10
期刊：
影响因子：
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通讯作者：
Xiang Wu;J. Thompson
中科院分区：
文献类型：
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作者：
Xiang Wu;J. Thompson
与传统的QR分解M（QRDM）算法相比，基于无偏MMSE度量的QRDM算法利用MMSE度量代替最大似然（ML）度量，以更低的复杂度提高了性能。然而，对于有效的硬件实现，在每个QRDM检测阶段所涉及的排序阶段仍然可能是相当耗时和消耗资源的。因此，我们提出了一种简化的QRDM方法，表示为S-QRDM，它只执行完整的枚举（FE）上的某些数量的顶部搜索层，而利用单一枚举（SE）的其余搜索层。因此，消除了对这些层的排序过程的需要，并且同时减少了所需的乘法器的数量。所提出的S-QRDM检测器已在最先进的Xilinx FPGA器件上实现，结果表明，与原始算法相比，所提出的方法在逻辑或计算FPGA资源上更有效。
In contrast to the conventional QR-decomposition M (QRDM) algorithm, the unbiased MMSE metric based QRDM algorithm exploits MMSE metric instead of the maximum likelihood (ML) metric, leading to enhanced performance with less complexity. However, for an efficient hardware implementation, the sorting stages involved at every QRDM detection stage can still be quite time and resource consuming. Hence, we propose a simplified QRDM approach, denoted as S-QRDM, which only performs the full enumeration (FE) on certain number of top search layers, while utilizing the single enumeration (SE) for the remaining search layers. Therefore, the need for the sorting process for those layers is eliminated and the required number of multipliers is reduced simultaneously. The proposed S-QRDM detector has been implemented on a state-of-the-art Xilinx FPGA device and the results indicate that the proposed approach is more efficient in either logic or computational FPGA resources compared to the original algorithm.