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A Baseband Waveform Mapping Method for FQPSK Trellis Coding

A mapping method and trellis coding technology, applied in baseband system components, phase-modulated carrier systems, shaping networks in transmitters/receivers, etc., can solve the problem that FQPSK cannot achieve strict and constant envelopes.

Active Publication Date: 2017-11-03
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention is to solve the problem that the existing FQPSK cannot realize the strict constant envelope, thereby providing a baseband waveform mapping method of FQPSK trellis coding

Method used

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  • A Baseband Waveform Mapping Method for FQPSK Trellis Coding
  • A Baseband Waveform Mapping Method for FQPSK Trellis Coding
  • A Baseband Waveform Mapping Method for FQPSK Trellis Coding

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specific Embodiment approach 1

[0051] The specific embodiment one, a kind of baseband waveform mapping method of FQPSK trellis coding, a kind of baseband waveform mapping method of FQPSK trellis coding, it is realized by the following steps:

[0052]Step 1. Perform serial / parallel conversion on the input signal A(t) to obtain parallel two-way data D I,n and D Q,n ;

[0053] Step 2. Define the calculation formulas for index i and index j:

[0054]

[0055] in:

[0056]

[0057]

[0058] According to formula (1), for two-way data D I,n and D Q,n Perform a cross-correlation operation to obtain the values ​​of index i and index j, where the values ​​of index i and index j are integers ranging from 0 to 15;

[0059] Step 3, use the values ​​of index i and index j as the read address of the waveform register, select the baseband waveform, and output two baseband signals;

[0060] The mapping scheme of described baseband waveform adopts formula (3) to realize:

[0061]

[0062]

[0063]

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Abstract

A baseband waveform mapping method of FQPSK trellis coding relates to the baseband waveform mapping technology of FQPSK trellis coding. The present invention is to solve the problem that the existing FQPSK cannot realize the strict constant of the envelope. The present invention performs serial / parallel conversion on the input signal A(t) to obtain parallel two-way data DI,n and DQ,n; performs cross-correlation operation on the two-way data DI,n and DQ,n to obtain index i and index The value of j, the index i and the value of index j are used as the read address of the waveform register, and the baseband waveform is selected, and two baseband signals are output; the obtained two baseband signals are modulated by FQPSK trellis encoding. The invention is suitable for deep space communication system.

Description

technical field [0001] The invention relates to the baseband waveform mapping technology of FQPSK trellis coding. Background technique [0002] In the deep space communication system, the problem of power limitation is serious. In order to effectively use power resources, nonlinear amplifiers are generally used in communication systems. The channel is non-linear. Therefore, constant envelope or quasi-constant envelope modulation technology with high power spectral efficiency should be used in deep space communication, so that the fluctuation of the modulated signal waveform envelope is as small as possible, thereby reducing the noise caused by the nonlinear power amplifier. influences. As a quasi-constant envelope modulation technology, FQPSK modulation has better performance in terms of spectral efficiency and bit error rate, and has been widely concerned in deep space communication. In recent years, people have done more research on FQPSK performance, but less research ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/20
Inventor 沙学军赵峰房宵杰马聪吴玮白旭
Owner HARBIN INST OF TECH