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Symmetrical extended binary phase shift keying modulation and demodulation method

A technology of binary phase shift keying and demodulation method, which is applied in the field of symmetrical extended binary phase shift keying modulation and demodulation, information modulation and demodulation, and can solve the problems of small, large gain, and signal power difference and other problems, to achieve the effect of simplifying the receiver structure, simple receiver structure, anti-additive interference and anti-fading performance

Active Publication Date: 2015-12-02
SOUTHEAST UNIV
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Problems solved by technology

However, the signal power corresponding to the symbol "1" and the symbol "0" after the impact is very different, if there are continuous "0" codes or "1" codes, it is easy to make the gain larger or smaller

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  • Symmetrical extended binary phase shift keying modulation and demodulation method
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  • Symmetrical extended binary phase shift keying modulation and demodulation method

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings.

[0045] A symmetrical extended binary phase shift keying modulation and demodulation method, based on the extended binary phase shift keying modulation method, which includes a symmetrical extended binary phase shift keying S-EBPSK modulator and S-EBPSK Signal demodulator. Compared with the EBPSK modulation, the symmetrical extended binary phase shift keying S-EBPSK modulator modifies the modulation waveform corresponding to the symbol 0, so that it generates the same symbol at the N / 2+1 carrier cycle. 1 Symmetrical phase jump; for the AWGN channel, the shock filter-based comparison decision demodulator includes a shock filter and a comparator to convert phase jump information into amplitude information, which can be directly judged by the comparison method. For flat fading channels, the IF-SC demodulator based on impact filtering can not only eliminate the influence o...

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Abstract

The present invention discloses a symmetrical extended binary phase shift keying modulation and demodulation method. By taking an extended binary phase shift keying modulation mode as the basis, the symmetrical extended binary phase shift keying modulation and demodulation method comprises a symmetrical extended binary phase shift keying (S-EBPSK) modulator and an S-EBPSK signal demodulator, the S-EBPSK modulator corrects a modulation waveform corresponding to a code element 0 relative to the EBPSK modulation, so that the code element 0 generates the phase jump symmetrical with a code element 1 at the (N / 2+1)-th carrier cycle. A modulation demodulation system of the present invention has the anti-noise and anti-fading performances obviously better than an EBPSK system, overcomes the disadvantage in the EBPSK that the threshold decision can not adapt to the signal amplitude change, and saves the modules, such as an automatic gain control module, an adaptive threshold decision module, etc., thereby simplifying the structure of a receiver substantially, and having the equivalent transmission rate and frequency spectrum utilization rate with the EBPSK.

Description

technical field [0001] The invention relates to information modulation and demodulation technology in digital communication, in particular to a symmetrical extended binary phase shift keying modulation and demodulation method, which belongs to the technical field of digital information transmission. Background technique [0002] In modern society, spectrum resources have become an important national strategic resource. Efficient modulation for the purpose of reducing the occupied bandwidth and increasing the information transmission rate (that is, increasing the spectrum utilization rate, the dimension is bps / Hz) is the current research focus in the information field. The current modulation and demodulation technology will be described below by taking EBPSK modulation and EBPSK signal demodulation as examples. [0003] 1. EBPSK modulation [0004] Taking the invention patent ZL200710025203.6 (unified binary quadrature modulation and demodulation method) as an example, the e...

Claims

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Application Information

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IPC IPC(8): H04L27/233
CPCH04L27/2334
Inventor 冯熳彭珊
Owner SOUTHEAST UNIV
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