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Improved continuous-phase modulation (CPM) soft demodulation initialization method

An initialization method and soft demodulation technology, applied in phase modulation carrier system, etc., can solve the problem that high-order CPM demodulation cannot be realized by hardware

Active Publication Date: 2014-11-19
西安烽火电子科技有限责任公司
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  • Application Information

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Problems solved by technology

Therefore, high-order CPM demodulation is almost impossible to implement in hardware

Method used

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  • Improved continuous-phase modulation (CPM) soft demodulation initialization method

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with accompanying drawing:

[0045] When the BCJR algorithm is used to demodulate and initialize the CPM signal, the received waveform is compared with each standard waveform to obtain the posterior probability of each standard waveform. Among them, the received waveform is denoted as r, and the jth standard waveform is denoted as s j , j ranges from 1 to J, and J is the total number of standard waveforms, then the posterior probability of the jth standard waveform is expressed as p(s j |r). Calculate the posterior probability p(s jThe essence of |r) is to calculate the distance d between the received waveform and the jth standard waveform j . d j The calculation formula is as follows:

[0046] d j = - 1 σ 2 Σ k = ...

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Abstract

The present invention belongs to the CPM soft demodulation technology field, in particular relates to an improved continuous-phase modulation soft demodulation initialization method. The improved continuous-phase modulation soft demodulation initialization method comprises the following steps of making a phase state diagram of a CPM signal of which the modulation order is M; taking a phase state in the range of [0, Pi / 2] as an initial phase on the phase state diagram of the CPM signal of which the modulation order is M, and generating a plurality of corresponding reference waveforms; calculating the correlative value of a reception waveform and each reference waveform; looking for a symmetric waveform of each reference waveform on the phase state diagram of the CPM signal of which the modulation order is M; calculating the correlative value of the reception waveform and the symmetrical waveform of each reference waveform; carrying out the demodulation initialization processing on the CPM signal according to the correlative value of the reception waveform and each reference waveform, and the correlative value of the reception waveform and the symmetrical waveform of each reference waveform.

Description

technical field [0001] The invention belongs to the technical field of CPM soft demodulation, in particular to an improved CPM soft demodulation initialization method. Background technique [0002] The continuous-phase modulation (Continuous-Phase Modulation, CPM) technology means that the phase change between transmitted symbols has a continuous and smooth transition characteristic. The advantage of this modulation method is that the main lobe of the transmitted signal power spectrum occupies a very narrow bandwidth, and the power of the side lobe is significantly lower than that of the main lobe, which can more effectively improve the utilization of the spectrum. Therefore, continuous phase modulation technology has become a modulation method often used in modern communication. The demodulation of phase continuous (CP) signal can be divided into hard demodulation and soft demodulation. [0003] The information measure adopted by the hard demodulation algorithm is a quant...

Claims

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Application Information

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IPC IPC(8): H04L27/20
Inventor 张凯梁峰杨勇马允龙朱广法徐铮刘琦李钧
Owner 西安烽火电子科技有限责任公司
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