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为了改善正交频分复用(orthogonal frequency division multiplexing,OFDM)在稀疏多径信道环境中的抗衰落能力,提出一种基于星座旋转调制OFDM系统的自适应交织方法。利用OFDM系统的多载波特点将旋转调制中的分量交织引入到子载波间交织,根据统计信道状态信息或实时信道状态信息,采用该文设计的交织器搜索准则来选取最佳分量交织图案,接收端将最佳的分量交织图案的索引反馈给发送端,实现了自适应交织。仿真结果表明该方法在稀疏多径衰落信道下有优异的抗衰落性能和较高的频谱利用率。
In order to improve the anti-fading capability of orthogonal frequency division multiplexing (OFDM) in sparse multipath channel environment, an adaptive interleaving method based on constellation rotation modulation OFDM system is proposed. Based on the multicarrier characteristics of OFDM system, the components in the rotation modulation are interleaved and interleaved among the subcarriers. According to the statistical channel state information or real-time channel state information, the interleaver search criterion designed in this paper is used to select the optimal component interleaving pattern, The end feeds back the index of the best component interleaving pattern to the sending end, realizing adaptive interleaving. The simulation results show that this method has excellent anti-fading performance and high spectral efficiency under sparse multi-path fading channel.