Continuous phase differential phase-shift keying modulation and demodulation method in signs

Abstract

The invention provides a continuous phase differential phase-shift keying modulation and demodulation method in signs, which is mainly applied to the field of wireless communications. In the signal modulation, the method mainly comprises the following steps of: providing a group of baseband signal set, wherein each signal in the set is a continuous path on a constellation diagram; when each burstcommunication begins, setting the state of a state memory to be a certain defined original state; and generating a corresponding output modulation signal according to a group of input bit informationvalues and the current state value of the state memory and updating the state value in the memory. In the signal demodulation process, the method comprises the following steps of: firstly calculatingphase change cumulant of received signs, then calculating the probability of the phase change cumulant on to which group of bit information value the phase change cumulant belongs, and selecting the bit information with maximum probability as decoding output of the current received signal. The invention ensures that the phase of the signal in one code element changes continuously, improves the effective emission power and avoids the influence on signal demodulation from the phase change among the signs, which is caused by initial phase and Doppler frequency shift, and the like.

Description

technical field [0001] The invention relates to a baseband signal modulation and demodulation method applied in deep space, air-to-ground, and air-to-air wireless communications in the field of mobile communications. The requirements of these communication systems for modulated signals are high in spectral characteristics, nonlinear power amplifiers and nonlinear power amplifiers can be applied. There is high-speed relative motion between communication terminals. Background technique [0002] In the field of mobile communication, due to the complex propagation environment of the signal between the transmitter and the receiver, the limitation of spectrum resources and the time-varying and multi-path transmission characteristics of the mobile channel, the wireless channel is generally considered to be a natural phenomenon. Poor communication channel. Limited available spectrum resources and complex wireless transmission environment are two restrictive factors in the field of ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a continuous change in the inter-symbol phase, which can significantly improve the effective transmission power of the power amplifier and the effective utilization of the spectrum, and can avoid the inter-symbol phase change caused by the initial phase and Doppler frequency shift. Intra-symbol continuous phase differential phase shift keying modulation and demodulation method to address the need for constant envelope and spectral efficiency in specific communication systems

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