Demodulation method and device for small modulation index continuous phase signal

Abstract

The invention discloses a demodulation method and device for a small modulation index continuous phase signal. According to the technical scheme, the demodulation method comprises steps that differential precoding is conducted on an original signal through a continuous phase modulator at a transmitting end; a receiving end sends the received signal to a continuous phase reconstructor, and the continuous phase reconstructor receives the processed signal and smoothes the signal into a continuous phase; the continuous phase signal generator is used for receiving the signals outputted by the continuous phase reconstructor and converting the signals outputted by the continuous phase reconstructor into continuous phase signals with a modulation index of 0.5; and the continuous phase signal withthe modulation index of 0.5 is demodulated by a serial demodulator. The demodulation method mainly aims to solve problems of difficult continuous phase signal synchronization and complex signal demodulation, and is mainly applied to the fields of mobile communication, satellite communication, deep space communication, remote measurement and the like.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a demodulation method and device for a small modulation index continuous phase signal. Background technique [0002] With the rapid development of communication technology, continuous phase signals have been continuously applied in various communication fields due to their advantages such as narrow occupied bandwidth and low interference from adjacent signals. For example, mobile communication, satellite communication, deep space communication and telemetry and other fields. [0003] At present, most signal demodulation is to reduce the demodulation complexity through the method of delay difference between adjacent bits, or to reduce the complexity increase problem caused by the correlation between symbols through the method of front and rear bit difference. In the process of realizing the above invention, the inventor found that in the prior art, there are problems such ...

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Problems solved by technology

[0003] At present, most signal demodulation is to reduce the demodulation complexity through the method of delay difference between adjacent bits, or to reduce the complexity increase problem caused by the correlation between symbols through the method of front and rear bit difference

In the process of implementing the above invention, the inventor found that in the prior art, there are limited application scenarios, demodulation needs to perform a large number of calculations such as "sum, addition, and ratio" through Viterbi decoding, and the complexity reduction is very limited.

As a result, the problems of difficult synchronization and high demodulation complexity of continuous phase signals have not been effectively solved, which directly limits its wide application

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