时频混合重叠复用系统的快速检测算法

为提高通信系统的频谱效率，研究了一种时频混合重叠复用系统，并提出针对该系统的基于Gabor变换的快速检测算法和利用误差反向传播思想的改进检测算法。实验结果表明，与利用最大似然序列估计检测算法相比，该算法在牺牲部分性能的条件下，检测速度大幅提高，且系统性能和检测速度做了很好的折衷，在较高信噪比时仍然优于相同频谱效率的高阶调制。采用相互重叠的信号复用传输方式直接提高传输速率比使用同样频谱效率的高阶QAM调制能带来更大的增益。

Fast Detection Approach of Time-Frequency Overlapped Hybrid Division Multiplexing System

In order to improve spectrum efficiency of communication system, a novel time-frequency overlapped hybrid division multiplexing system was researched. A rapid detection algorithm based on Gabor transform and an improved detection algorithm using error back propagation method was proposed. The simulation results show that the proposed rapid detection algorithm obtains significant increase in detection speed at the expense of some performance compared with maximum likelihood sequence estimation algorithm, and that the improved detection algorithm is a good compromise between system performance and detection speed and its performance is still better than the high level modulation with the same spectrum efficiency at a high signal to noise ratio. This shows that improving the transmission data rate with overlapped signals can achieve greater gains than using high-level QAM modulation with the same spectrum efficiency.