SOQPSK调制体制识别及参数提取方法研究

Research on identification and parameter extraction of SOQPSK

摘要:

围绕SOQPSK调制体制识别,以理论推导和实测验证相结合,分析其IQ轨迹、频谱域以及调制域等特征并作为其判别依据；基于最佳接收理论,提出基于EVM作为指示的符号率的提取方法；利用矢量信号源模拟产生MHCPM、FQPSK以及SOQPSK三种恒包络信号,在信噪比30dB的条件下,三种调制体制信号的识别率达100%,SOQPSK符号率提取误差小于0.002%,实现SOQPSK数据的解调输出。

Abstract:

Focus on the identification of SOQPSK modulation schemes. Combine theoretical derivation with practical measurement verification to analyze characteristic such as IQ trajectory, frequency spectrum, IQ time-domain, and modulation domain. Based on the optimal reception theory, a method for extracting symbol rate based on EVM(Error Vector Magnitude ) is proposed. Utilizing vector signal sources to generate three kinds of constant-envelop signals, namely MH CPM, FQPSK and SOQPSK. Under the condition of SNR 30dB，the recognition rate of these three modulation scheme signals reaches 100%, and the extraction error of the SOQPSK symbol rate is less than 0.002%, and data demodulation is successfully achieved.