A serial cascaded compiling and decoding system including rotary modulation mode of constellation map

A technology of serial cascade and rotary modulation, applied in the field of digital information transmission, can solve problems such as nonlinear distortion

Inactive Publication Date: 2008-09-10
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

[0002] Since the transmission channel of the digital signal is not ideal, it is susceptible to nonlinear distortion caused by amplifier saturation cutoff and multipath interference.

Method used

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  • A serial cascaded compiling and decoding system including rotary modulation mode of constellation map
  • A serial cascaded compiling and decoding system including rotary modulation mode of constellation map
  • A serial cascaded compiling and decoding system including rotary modulation mode of constellation map

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Embodiment Construction

[0036] In the following and accompanying drawings, we take the non-square 8QAM modulation and demodulation mode of π / 2 phase shift and π / 4QPSK as examples to illustrate the principle and structure of the serial concatenated encoding and decoding system proposed by the present invention, and compare it with The commonly used non-square 8QAM modulation and demodulation technology and π / 4QPSK modulation and demodulation technology are compared with each other, their advantages in transmission in nonlinear channels and improvement of bit error performance are illustrated, and the comparison results of computer simulation are given.

[0037] From figure 1 It can be seen from the gray-encoded constellation diagram that in the 3-bit codes corresponding to the constellation points (black dots) in the odd-time constellation diagram and the constellation points (white dots) in the even-time constellation diagram, there can only be odd numbers Bits are different, that is, only 1 or 3 bit...

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Abstract

The invention relates to a revolution-modulation serially concatenated coding and decoding system with a star map, which pertains to the field of numerical information coding and decoding and is characterized in that: by artful mapping and analyzing, modulation-analysis is divided into three independent parts: even-odd check coding, recursive convolution coding and a memoryless 8PSK or square M-QAM modulation. Memorability contained in the modulation process is taken as a united internal code and then forms the serially concatenated coding system together with a simple outer code concatenated. Considerable coding gain and excellent error code performance can be obtained at a receiving end by iterative decoding.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and in particular relates to a serial concatenated coding and decoding technology applied to a constellation rotation modulation mode. Background technique [0002] Since the transmission channel of the digital signal is not ideal, it is susceptible to nonlinear distortion caused by amplifier saturation cut-off and multipath interference. Commonly used methods against nonlinearity mainly include predistortion, nonlinear equalization, and constant envelope modulation techniques. Constant envelope technology and quasi-constant envelope technology adjust the envelope or phase of the carrier signal so that the modulated signal can keep the envelope constant or approximately constant after passing through the filter, so that it can work in the power amplifier Linear range, thereby reducing nonlinear distortion. Because this method does not depend on the nonlinear characteris...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 杨知行刘昌清李志刚张彧潘长勇
Owner TSINGHUA UNIV
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