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快速跳频正交频分复用(FFH-OFDM)在常规的OFDM符号中加入快速跳频预编码矩阵(FFH),使其在多径时变的衰落环境下具有良好的抗衰落性能[1]。本文首先对循环预编码矩阵带来的噪声半混合进行了分析,并进一步提出了噪声全混合的预编码矩阵,分析了其误码率。仿真结果表明,频率选择性信道下,在高信噪比时全混合较之半混合预编码矩阵进一步提高了OFDM系统抗衰落的能力。
Fast Frequency Hopping Orthogonal Frequency Division Multiplexing (FFH-OFDM) The fast frequency hopping pre-coding matrix (FFH) is added to the conventional OFDM symbols so that it has good anti-fading performance under the multi-path time-varying fading environment [1 ]. In this paper, the noise half-mixing caused by cyclic precoding matrix is analyzed firstly, and the noise-mixed precoding matrix is further proposed, and its bit error rate is analyzed. The simulation results show that under frequency-selective channel, full mixing compared with the semi-mixed precoding matrix at high signal-to-noise ratio can further improve the anti-fading ability of the OFDM system.