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为提高多输入多输出(MIMO)中继系统的吞吐量性能并降低反馈信令比特数,提出了一种应用于两跳中继系统的子信道和调制方式联合自适应选择方法.源端到目的端的信道被当作一个等效信道,通过奇异值分解,该等效信道被分解成多个并行子信道.该算法将使用的子信道数及相应的调制方式作为一个整体进行选择及反馈.仿真结果表明,与传统各子信道独立选择调制方式的方法相比,该方法可使用较少的信令比特数实现较高的吞吐量性能.
In order to improve the throughput performance and reduce the number of bits of feedback signaling in a multiple input multiple output (MIMO) relay system, a joint adaptive selection method of subchannels and modulation schemes for a two-hop relay system is proposed. The destination channel is regarded as an equivalent channel, and the equivalent channel is decomposed into multiple parallel sub-channels by singular value decomposition.The algorithm chooses and feeds back the number of sub-channels used and the corresponding modulation mode as a whole. The simulation results show that this method can achieve higher throughput performance with fewer signaling bits compared with the traditional method of independently selecting modulation schemes for each subchannel.