基于子信道误码率的小波包调制结构优化算法

Algorithm on Optimization for Wavelet Packet Modulation Structures Based on BER of Sub-Channel

为降低小波包调制(Wavelet Packet Modulation,WPM)系统的误码率,提出了一种基于各子信道误码率大小的小波包调制结构优化算法。该算法将满树结构各节点代表的子信道的误码率作为各节点的度量值,然后按照一定的剪枝规则比较父节点和子节点的度量值,将满树结构中导致系统误码率升高的子节点进行剪枝实现调制结构的优化。理论分析和仿真表明,与其他算法相比,该算法优化出的调制结构能够进一步降低WPM系统的误码率,且算法计算复杂度较低。

To reduce the bit error ratio （BER） of the wavelet packet modulation （WPM） system, an algorithm on optimization for WPM structures based on BER of each sub-channel was proposed. In this algorithm, sub-channel BER represented by each node of the full structure was regarded as a measurement of each node, and in accordance with certain rules, optimization of the modulation structure was achieved by pruning to the sub-node which increased system BER. Theoretical analysis and simulation results show that, compared with other algorithms, the modulation structure optimized by the new algorithm can further reduce the BER of the WPM system, and the computational complexity of the new algorithm is lower.