一种新的多天线系统中的快速广义球形解码算法
A New Fast Generalized Sphere Decoding Algorithm in MIMO Systems
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摘要: 该文提出了一种新的广义球形解码算法.与常规球形解码算法相比,它能够处理多输入多输出系统(MIMO)中发送天线M多于接收天线N的情形,并且其解码速度远大于已有的广义球形解码算法.其基本思想是将M维的传输信号矢量分成N-1和M-N+1维的子矢量xa和xb,通过一些简单地变换,就可以使用一个常规球形解码器来选取合适的xb,然后再利用另一个常规球形解码器来获得xa,从而得到整个传输信号矢量.仿真结果表明,这种新的快速广义球形解码算法(命名为双层球形解码算法)比现有的广义球形解码算法具有更低的复杂度.Abstract: A new generalized sphere decoding algorithm is proposed for under-determined MIMO systems with fewer receive antennas TV than transmit antennas M. The proposed algorithm is significantly faster than the existing generalized sphere decoding algorithms. The basic idea is to partition the transmitted signal vector into two subvectors xa and xb with N-1 and M- N+l elements respectively. After some simple transformations, an outer layer Sphere Decoder (SD) can be used to choose proper xb and then use an inner layer SD to decide xa thus the whole transmitted signal vector is obtained. Simulation results show that Double Layer Sphere Decoding (DLSD) has far less complexity than the existing Generalized Sphere Decoding (GSDs).
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