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在正交频分复用(OFDM)系统中,综合利用时、频域信息的二维差分解调算法(2-DDD),更有利于对抗时频双选信道衰落。该文研究了基于M进制差分幅度相位键控(M-DAPSK)的2-DDD算法,该算法使得基于无编码的64DAPSK-OFDM系统在加性Gauss白噪声信道误码率10-4处可获得1.35 dB的性能增益。为降低2-DDD中最优路径搜索的复杂度,提出了5种可能的解决途径,并分析时间复杂度和空间复杂度。仿真结果表明,采用本文的广度优先存储式算法和深度优先存储式算法,使搜索算法复杂度降低约98%。
In Orthogonal Frequency Division Multiplexing (OFDM) system, the two-dimensional differential demodulation algorithm (2-DDD) of time and frequency domain information is comprehensively used to combat the time-frequency double channel fading. In this paper, the 2-DDD algorithm based on M-ary differential magnitude phase-shift keying (M-DAPSK) is studied in this paper. This algorithm makes 64DAPSK-OFDM system based on no coding at the error rate of additive Gaussian white noise channel 10-4 Achieve 1.35 dB performance gain. In order to reduce the complexity of optimal path search in 2-DDD, five possible solutions are proposed, and the time complexity and spatial complexity are analyzed. Simulation results show that the breadth-first storage algorithm and depth-first storage algorithm in this paper can reduce the complexity of search algorithm by about 98%.