带限MPSK信号码元宽度的盲估计

Blind Estimation of Code-width for Bandlimited MPSK Signals

理想MPSK信号在码元跳变处表现为相位的不连续性。小波变换能有效检测出这些信号细节,从而为估计码元宽度提供了依据。实际系统常采用脉冲成形技术减小发射带宽,改变了信号包络,从而影响了小波变换的检测性能。本文对截获接收机输出的信号进行预处理后再利用基于Haar小波变换的算法提取码元宽度信息,理论分析和实际信号处理表明,这种算法能有效检测码元跳变,从而估计出码元宽度。

Ideal MPSK signals appear discontinuity in phase at the points of code change. The wavelet transform can detect the signal details effectively, which provides a basis to estimate code-width. Practical communication systems often apply pulse shaping technique to reduce transmission bandwidth, which reshapes signal envelop. The technique could influence the detection performance of wavelet transform. This paper will abstract the code-width information from the preprocessed signals on the basis of Haar wavelet transform. Both theoretical analysis and practical signal processing demonstrate this algorithm can detect phase changes and estimate code-width effectively.