A Low Complexity Real-time MIMO-Preprocessing For Fixed Complexity Sphere Decoder
A Low Complexity Real-time MIMO-Preprocessing For Fixed Complexity Sphere Decoder
复制标题
固定复杂度球形解码器的低复杂度实时 MIMO 预处理
DOI：
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复制
发表时间：
2011
期刊：
影响因子：
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通讯作者：
Roger Francis Woods
中科院分区：
文献类型：
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作者：
X. Chu;J. McAllister;Roger Francis Woods
Modern Multiple-Input Multiple-Output (MIMO) communication systems place huge demands on embedded processing resources in terms of throughput, latency and resource utilization. State-of-the-art MIMO detector algorithms, such as Fixed-Complexity Sphere Decoding (FSD), rely on efficient channel preprocessing involving numerous calculations of the pseudo-inverse of the channel matrix by QR Decomposition (QRD) and ordering. These highly complicated operations can quickly become the critical prerequisite for real-time MIMO detection, exaggerated as the number of antennas in a MIMO detector increases. This paper describes a sorted QR decomposition (SQRD) algorithm extended for FSD, which significantly reduces the complexity and latency of this preprocessing step and increases the throughput of MIMO detection. It merges the calculations of the QRD and ordering operations to avoid multiple iterations of QRD. Specifically, it shows that SQRD reduces the computational complexity by over 60-70% when compared to conventional MIMO preprocessing algorithms. In 4×4 to 7×7 MIMO cases, the approach suffers merely 0.16-0.2 dB reduction in Bit Error Rate (BER) performance.
