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CPM-based RCM encoding method, decoding method and system

A coding method and decoding technology, applied in the field of rate-adaptive transmission, can solve problems such as poor transmission performance of wireless communication systems, and achieve the effect of low demodulation error rate

Active Publication Date: 2020-01-21
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 CPM-based RCM encoding method, decoding method and system, 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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  • CPM-based RCM encoding method, decoding method and system
  • CPM-based RCM encoding method, decoding method and system
  • CPM-based RCM encoding method, decoding method and system

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[0127] 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 .

[0128] 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:

[0129] the s in (t)=A in (t)exp[jφ in (t)]

[0130] the s out (t)=G[A in (t)]exp[j{φ in (t)+Φ[A in (t)]}]

[0131] 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 CPM-based RCM encoding method, a decoding method and a system, and belongs to the technical field of rate adaptive transmission in wireless communication. The method comprises the following steps: enabling an RCM encoding symbol to obtain a constant envelope signal with the peak-to-average ratio of 0dB through CPM modulation; internal iteration is carried out for multipletimes by adopting a BP method; continuously updating the message from the coding symbol to the random signal and the message from the random signal to the coding symbol; and when the maximum number of iterations is reached, outputting the prior probability corresponding to the coded symbol and transmitting the prior probability to a CPM demodulator, updating the maximum posteriori probability ofthe coded symbol according to the transmitted prior probability of the coded symbol, transmitting the updated maximum posteriori probability to an RCM decoder, updating a message from the coded signalto a random signal, and obtaining the probability that the random signal values are 0 and 1. According to the invention, the problem that the RCM high-power signal falls in the nonlinear region of the power amplifier to generate nonlinear distortion is avoided.

Description

technical field [0001] The invention belongs to the technical field of rate adaptive transmission in wireless communication, and more specifically relates to a CPM-based RCM encoding method, decoding method and system. 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 powe...

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Application Information

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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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