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在多进制正交扩频MDPSK复合调制系统中,现有的检测算法先后独立地进行正交扩频比特与差分相位比特的检测,这使得差分相位比特检测性能与正交检测的性能息息相关,限制了整个系统的误比特性能。针对这一情况,本文基于最大后验概率(MAP)准则,提出了NOrth-MDPSK最佳检测算法。该算法根据差分相位检测的特点,充分利用前后两个符号周期内所有的正交相关值,联合检测当前符号的正交扩频比特和差分比特。仿真结果表明,本文所提算法能够有效地缓解正交检测的性能对系统性能的限制。
In the multi-ary orthogonal spread spectrum MDPSK complex modulation system, the existing detection algorithms independently and independently perform the detection of the orthogonal spreading bits and the differential phase bits, which makes the performance of the differential phase bit detection and the performance of the orthogonal detection closely related. Limiting the error performance of the entire system. In view of this situation, this paper proposes the NOrth-MDPSK best detection algorithm based on the maximum a posteriori probability (MAP) criterion. According to the characteristics of differential phase detection, the algorithm makes full use of all quadrature correlation values in two symbol periods before and after, and detects the orthogonal spreading bits and differential bits of the current symbol jointly. The simulation results show that the proposed algorithm can effectively reduce the performance of the orthogonal test system performance constraints.