Method for jointly demodulating MSK and DSSS and demodulator thereof

A joint demodulator and joint demodulation technology, which is applied to the shaping network, electrical components, and transmission systems in the transmitter/receiver, can solve the problems of frequency offset estimation, PN code synchronization, and bit synchronization extraction complexity. Achieve the effects of low hardware resource consumption, phase error elimination, and flexible form

Inactive Publication Date: 2012-05-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the traditional Minimum Shift Keying (MSK) modulated direct spread signal despread demodulation method needs frequency offset estimation, PN code synchronization, bit synchronization extraction complexity and other issues, propose a MSK and direct Sequential Spread Spectrum (DSSS) Joint Demodulation Method

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  • Method for jointly demodulating MSK and DSSS and demodulator thereof
  • Method for jointly demodulating MSK and DSSS and demodulator thereof

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[0035] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0036] An MSK and DSSS joint demodulator of the present invention includes a phase difference information acquisition module, a matched filter module, a synchronization information acquisition module, a demodulation module and a tracking module.

[0037] In the physical layer of the weapon coordination data transmission equipment, the MSK modulation is adopted for the DSSS signal, and the joint demodulation of MSK and DSSS is carried out by the invention at the receiving end. Let N=8, a=5, b=32, r=4, and the synchronization head is 1100001001 00010 00111 00000 (24, 9, 2, 0).

[0038] figure 1In the method shown, the digital intermediate frequency signal is quadrature down-converted to baseband, and low-pass filtering and sampling rate conversion are performed to obtain I and Q two-way signals, and the phase difference information is obtained by...

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Abstract

The invention belongs to the technology filed of wireless communication, relating to a method for jointly demodulating MSK (minimum shift keying) and DSSS (direct sequence spread spectrum) and a demodulator thereof. The demodulator comprises an error information obtaining module, a match filter module, a synchronous information trapping module, a demodulating module and a tracking module; and themethod for jointly demodulating MSK and DSSS comprises the following steps of: (1) obtaining error information, (2) matching and filtering the error information, (3) trapping synchronous information,(4) demodulating, (5) tracking, or the like, and sending demodulation results to parent process so as to complete communication process. The invention has the advantage of better frequency compensation ability, thereby, solving the problems that a method for dispreading and demodulating direct sequence spread spectrum signals needs to be frequency offset estimated, complex extraction of PN code synchronization and bit synchronization, etc. Compared with the existing dispreading and demodulating method, the invention is simple as needing no carrier recovery module nor bit timing module, and isapplicable to the wireless communication system.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a combined demodulation method and demodulator of MSK (minimum frequency shift keying) and DSSS (direct sequence spread spectrum). Background technique [0002] Compared with the analog communication method, the digital communication method has many advantages, such as strong anti-interference ability, no noise accumulation, high communication quality; it is convenient for encryption processing and high security intensity, and the digital signal is convenient to directly interface with the computer to form an intelligent network; Flexibility and versatility, equipment is easy to integrate and miniaturize, so digital communication has gradually replaced analog communication in communication applications and has become the main way in the communication field. [0003] MSK minimum frequency shift keying is a special binary continuous phase frequency shift keying. It overcomes th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7075H04B1/7093H04L25/03
Inventor 张德生安建平韩昊鹏卜祥元周荣花
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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