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本文对正交重叠升余弦—QORC(Quadra-ture Overlapped Raised—Cosine Modulation)和修饰正交重叠升余弦—MQORC(Modified QORC Modulation)调制方式进行了改进和推广,提出了一种新型调制方式:自卷积最小频移键控,简称SCMSK(Self-convolving Minimum Shift Keying)。从信号处理理论的角度,论述了SCMSK调制原理,推导了SCMSK的理论功率谱密度,并对它在非线性信道中的功率谱密度及误码性能进行了计算机模拟。结果表明,SCMSK功率谱密度旁瓣滚降速度比MSK,QORC和MQORC都快,误码性能也优于MSK和SQORC。最后用硬件实现了码元数据率为128 kbit/s的调制器。
In this paper, we improve and generalize Quadra-ture Overlapped Raised-Cosine Modulation and Modified Quadrature Overlap Cosine-Modulation (QORC) Modulation method. A new modulation method is proposed Convolution minimum shift keying, referred to as SCMSK (Self-convolving Minimum Shift Keying). From the perspective of signal processing theory, the principle of SCMSK modulation is discussed, and the theoretical power spectral density of SCMSK is deduced. The power spectral density and error performance in SCMSK are simulated by computer. The results show that the sidelobe roll off rate of SCMSK power spectral density is faster than that of MSK, QORC and MQORC, and the error performance is better than that of MSK and SQORC. Finally, a modulator with a symbol rate of 128 kbit / s is implemented in hardware.