Multielement positional phase shift keying modulation and demodulation method

A technology of phase-shift keying and demodulation method, which is applied in the direction of phase-modulated carrier system, etc., can solve the problems of inconvenient high-ary modulation, etc., achieve the effect of flexible performance design and index adjustment, simple structure, and ease of design difficulty

CN100586116CActive Publication Date: 2010-01-27苏州东奇信息科技股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2010-01-27

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Abstract

The method comprises: using M-scale notation information symbols to directly control the location of sinusoidal carrier phase jump moment in each code element cycle, and inserting a certain guard gap to implement the modulation of M-element signals so as to realize the higher rate transmission in case of the symbol rate same with the EBPSK (extended binary phase shift keying) and same bandwidth occupation.
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Description

technical field

[0001] The invention relates to information modulation and demodulation in digital communication, in particular to a multi-position phase-shift keying modulation and demodulation method, which belongs to the technical field of high-efficiency digital information transmission. Background technique

[0002] In a digital communication system, the process of moving binary data to a given transmission frequency band is called modulation, and the opposite process is called demodulation. In practice, we not only pursue the highest possible frequency band utilization, that is, transmit a higher digital rate (measured in bps / Hz) within the unit frequency band; we also hope to use the transmission energy more effectively to obtain better transmission effects .

[0003] The applicant's previous patent application "unified binary phase modulation and demodulation method" (application number: 200610040767.2, publication number: CN1889550A), proposed a unified description...

Examples

Embodiment

[0045] Embodiment: system parameter: get carrier frequency f c = 465kHz, N = 10, phase deflection Sampling rate f s =10f c = 4.65MHz, r g =0, then the carrier period T=1 / f c , symbol rate=1 / (10T)=46.5kHz.

[0046] Such as figure 1 As shown, the sampling value of the basic waveform of the modulation symbol is stored in the waveform table, and the symbol value of the input symbol sequence is looked up in the table and the corresponding MPPSK modulated signal waveform is sent through the digital-to-analog converter (D / A). Using this hardware lookup table implementation, even if a non-zero guard interval r is inserted g , and will not add additional computation and overhead.

[0047] Such as figure 2 As shown, a signal demodulator structure based on a phase-locked loop is adopted. When carrier synchronization and symbol synchronization are realized, position detection and integral judgment are performed on the PD output to realize signal demodulation.

[0048] image 3...