一种利用节点误码率大小的调制结构优化算法

Algorithm on Optimization for Wavelet Packet Modulation Structures Based on BER of Each Node

为降低小波包调制系统的误码率,该文提出了一种利用各节点误码率大小的调制结构优化算法。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,按照一定的剪枝规则将满树结构中导致系统误码率升高的子节点剪枝实现调制结构的优化。理论分析和仿真结果表明,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系统误码率,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 wavelet packet modulation structures based on BER of each node is proposed in this paper.In this algorithm,sub-channel BER represented by each node of the full structure as a measurement of each node,and in accordance with certain rules of pruning optimization of the modulation structure is achieved by the pruning to sub-node which increases system BER in full tree structure.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.