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A continuous phase demodulation method based on reliability

A phase demodulation and reliability technology, applied in the modulation carrier system, phase modulation carrier system, digital transmission system and other directions, can solve the problems of reducing complexity and large amount of calculation, so as to reduce complexity, ensure effectiveness, reduce The effect of hardware resource requirements

Inactive Publication Date: 2019-05-03
西安烽火电子科技有限责任公司
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Problems solved by technology

[0005] In order to solve the above problems, the present invention discloses a continuous phase demodulation method based on reliability. This method is used to solve the problem that the calculation amount of continuous phase demodulation is large, and the correlation value between the received signal and the modulated signal is used as the Information measurement greatly reduces the complexity of demodulation, and this method does not depend on the channel noise variance, avoiding the impact of inaccurate channel noise variance estimation on demodulation performance, and has the advantages of simplicity, reliability, and easy engineering implementation

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  • A continuous phase demodulation method based on reliability
  • A continuous phase demodulation method based on reliability
  • A continuous phase demodulation method based on reliability

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[0057] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0058] First, the basic concepts and basic parameters involved in the embodiments of the present invention are set forth as follows:

[0059] Expression and Modulation of CPM Signals

[0060] The normalized power baseband complex envelope mathematical expression of described CPM signal is:

[0061]

[0062] Among them, T is the symbol time duration of the CPM signal, the value range of t is [nT,(n+1)T], q(t) is the phase impulse response, The function g(t)...

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Abstract

The invention discloses a continuous phase demodulation method based on reliability, which comprises the following steps: initializing a forward recursive variable and a backward recursive variable, and calculating the reliability information of each edge of the nth Tellis after correction; carryint out Forward recursion and backward recursion calculation, and translating an information vector atthe same time; And carrying out information extraction calculation and judgment calculation on the nth symbol of the CPM signal. According to the continuous phase demodulation method based on the reliability, the correlation value between the received signal and the transmitted modulation signal is used as the information measurement, the calculation complexity is greatly reduced, and the requirement for hardware resources is reduced on the premise that the demodulation performance is not sacrificed. The method solves the problem of large calculation amount of continuous phase demodulation, can be applied to various communication systems based on CPM modulation and demodulation, does not need to estimate channel noise, and has very high robustness.

Description

technical field [0001] The invention belongs to the technical field of signal modulation and demodulation, in particular to a reliability-based continuous phase demodulation method. Background technique [0002] With the rapid development of wireless communication technology, the contradiction between the ever-increasing demand for communication services and spectrum resources has gradually emerged. In order to solve this problem, one solution is to use high-frequency bands for communication, which has higher requirements on the radio frequency modules of the transmitter and receiver, making it difficult to realize; another solution is to Adopt efficient continuous phase modulation CPM method: on the one hand, CPM has high spectral efficiency, low out-of-band power and signal constant envelope characteristics, etc., which can effectively overcome the problem of increasing shortage of spectrum resources; With the large-scale application of modern codec technology in the fiel...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/22H04L27/227
Inventor 张凯张青松朱广法马允龙黄薇婕陈测库王小军王陈春张健
Owner 西安烽火电子科技有限责任公司
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