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Baseband waveform mapping method of FQPSK mesh code

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

Active Publication Date: 2015-08-26
HARBIN INST OF TECH
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  • Abstract
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  • Application Information

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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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  • Baseband waveform mapping method of FQPSK mesh code
  • Baseband waveform mapping method of FQPSK mesh code
  • Baseband waveform mapping method of FQPSK mesh code

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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] i = I 3 × 2 3 + I 2 × 2 2 + I 1 × ...

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Abstract

The invention discloses a baseband waveform mapping method of a FQPSK mesh code, and relates to the baseband waveform mapping technology of the FQPSK mesh code. The problem that the existing FQPSK cannot realize the strict constancy of an envelope is solved. The method comprises the following steps: performing serial / parallel conversion on an input signal A(t) to obtain two paths of parallel data DI,n and DQ,n; performing cross correlation operation of the two paths of data DI,n and DQ,n to obtain values of an index i and an index j, using values of the index i and the index j as a read address of a waveform register, and selecting the baseband waveform to output two paths of baseband signals; performing FQPSK mesh coded modulation on the obtained two paths baseband signals. The method is suitable for a 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 ...

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Application Information

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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