A kind of decoding method and system of rcm coding method based on cpm

An encoding method and decoding technology, applied in the field of rate adaptive transmission, can solve problems such as poor transmission performance of wireless communication systems

Active Publication Date: 2021-04-06
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the defects of the prior art, the object of the present invention is to provide a decoding method and system based on a CPM-based RCM encoding method, aiming to solve the problem that the existing RCM has a relatively high peak-to-average ratio, which leads to poor transmission performance of the wireless communication system

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  • A kind of decoding method and system of rcm coding method based on cpm
  • A kind of decoding method and system of rcm coding method based on cpm
  • A kind of decoding method and system of rcm coding method based on cpm

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[0128] In order to illustrate the effectiveness of the present invention, a simulation comparison between the present invention and traditional RCM-QAM will be carried out below. Conditions for RCP-CPM (RCM system of CPM) and RCM-QAM performance comparison: in the presence of nonlinear power amplifiers, ensure that RCM-CPM and RCM-QAM have the same bandwidth, and then compare the spectral efficiency of the two .

[0129] In the embodiment solid-state power amplifier (SSPA) is as nonlinear power amplifier PA (power amplifier), the input model s of SSPA in (t) and the output model s out (t) are respectively:

[0130] the s in (t)=A in (t)exp[jφ in (t)]

[0131] the s out (t)=G[A in (t)]exp[j{φ in (t)+Φ[A in (t)]}]

[0132] Among them, s in (t) is the input model of SSPA; s out (t) is the output model of SSPA; A in (t) is the amplitude of SSPA input signal; φ in (t) is the phase of the SSPA input signal; G[A in (t)] is the conversion function between amplitude and...

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Abstract

The invention discloses a decoding method and system of a CPM-based RCM coding method, belonging to the technical field of rate-adaptive transmission in wireless communication. RCM coding symbols obtain a constant envelope signal with a peak-to-average ratio of 0 dB through CPM modulation; The BP method performs multiple internal iterations, and continuously updates the message from the coded symbol to the random signal and the message from the random signal to the coded symbol. When the maximum number of iterations is reached, the prior probability corresponding to the output coded symbol is passed to the CPM demodulator, according to The prior probability of the coded symbol transmitted is updated and the maximum posterior probability of the coded symbol is passed to the RCM decoder to update the message from the coded signal to the random signal to obtain the probability of the random signal taking the value of 0 and 1. The invention avoids the problem that the RCM high-power signal falls in the nonlinear region of the power amplifier and produces nonlinear distortion.

Description

technical field [0001] The invention belongs to the technical field of rate adaptive transmission in wireless communication, and more specifically, relates to a decoding method and system of a CPM-based RCM encoding method. Background technique [0002] In wireless communication, adaptive selection of transmission parameters according to different channel conditions is crucial to the spectral efficiency of the system. RCM (Rate Compatible Modulation for Blind Rate Adaptive Transmission: Rate Compatible Modulation) is a seamless rate adaptive coding technology that can continuously adjust the spectrum utilization rate according to channel conditions within a large SNR range, which can effectively improve The transmission efficiency under the time-varying wireless channel has broad application prospects in wireless communication. However, RCM has a relatively high peak-to-average ratio and has high requirements on the linear amplification range of the power amplifier. If the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
CPCH04L1/0002H04L1/005H04L1/0055
Inventor 鲁放董燕奉凤周雨秋
Owner HUAZHONG UNIV OF SCI & TECH
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