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为了降低通信系统传输信号的峰均比,提出了一种相比同谱效率正交幅度调制(QAM)减少电平数的编码调制方案.通过选择合适的码率与映射规则,调制时无需在比特向量到星座点之间建立一一映射的关系;相比一般的调制系统,该系统减少了星座点数量,增大了星座点间距离,可因此获得更低的陡降门限和峰均比.同时,对该系统的若干设计准则进行了分析,并根据相关准则设计了一种代替传统64QAM调制的新型星座.仿真结果显示,该方案误码率性能可超过传统采用64QAM的比特交织编码调制系统.
In order to reduce the peak-to-average ratio of transmission signals in the communication system, a coding modulation scheme is proposed to reduce the number of levels compared to the same spectral efficiency quadrature amplitude modulation (QAM). By selecting the appropriate code rate and mapping rule, Bit vectors to the constellation points to establish a one-to-one mapping relationship; Compared to the general modulation system, the system reduces the number of constellation points, increasing the distance between the constellation points, thus resulting in lower steepness threshold and peak-to-average ratio At the same time, some design criteria of this system are analyzed, and a new constellation which replaces the traditional 64QAM modulation is designed according to the relevant guidelines.The simulation results show that the bit error rate performance of this scheme can surpass that of the traditional 64QAM bit interleaved coded modulation system.