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Message signal broadcasting method and device based on phase discontinuous R-CSK modulation

A R-CSK, non-continuous technology, applied in the field of navigation signal design and communication, can solve the problems of increasing the CSK/R-CSK demodulation bit error rate, interfering with CSK/R-CSK demodulation judgment, etc., to improve the demodulation performance, increase transmission rate, and keep power density unchanged

Active Publication Date: 2020-12-01
SPACE STAR TECH CO LTD
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Problems solved by technology

When there is multi-path interference, the CSK / R-CSK modulated signal using this phase configuration is likely to generate large correlation peak sidelobes at the output of the signal demodulator, which interferes with the CSK / R-CSK demodulation decision and increases the CSK / R-CSK demodulation bit error rate

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  • Message signal broadcasting method and device based on phase discontinuous R-CSK modulation
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  • Message signal broadcasting method and device based on phase discontinuous R-CSK modulation

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Embodiment Construction

[0061] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0062] In the actual application of the text signal broadcasting method based on phase discontinuous R-CSK modulation of the present invention, such as figure 1 As shown, the application of IQ two-way quadrature modulation realizes the broadcasting of dual-rate composite message signals.

[0063] The basic message is modulated on the in-phase I branch, and BPSK-DSSS direct-sequence spread spectrum is performed on the basic message to construct the in-phase I branch baseband signal;

[0064] The extended message is modulated on the orthogonal Q branch, and the phase non-continuous R-CSK-DSSS direct sequence spread spectrum is performed on the extended message to construct the baseband signal of the orthogonal Q branch; that is, when the extended message is modulated, each waiting The modulation symbol determines the pseu...

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Abstract

The invention discloses a message signal broadcasting method and device based on phase discontinuous R-CSK modulation. The method comprises the following steps: modulating a basic message on an in-phase I branch, and performing BPSK-DSSS direct sequence spread spectrum on the basic message to construct an in-phase I branch baseband signal; modulating the extended message on an orthogonal Q branch,and performing phase discontinuous R-CSK-DSSS direct sequence spread spectrum on the extended message to construct an orthogonal Q branch baseband signal; when the spread message is modulated, determining a pseudo-random spread spectrum sequence for each symbol to be modulated, and keeping a fixed phase interval between two symbols to be modulated with adjacent numerical values by adopting a cyclic shift mode on a basic pseudo-random spread spectrum sequence, wherein the fixed phase interval is at least greater than the chip phase of one pseudo-random spread spectrum sequence, i.e., the phaseinterval between the initial phases (taking the chip as a unit) of the pseudo-random spread spectrum sequence corresponding to two modulation symbols with any adjacent numerical values is a fixed value, and the difference is more than two chips; and carrying out IQ quadrature modulation on the basic message baseband signal of the in-phase I branch and the extended message baseband signal of the quadrature Q branch to form a dual-rate composite message signal, and broadcasting the dual-rate composite message signal.

Description

technical field [0001] The invention relates to a message signal broadcasting method and device based on phase discontinuous R-CSK modulation, belonging to the technical field of communication and navigation signal design. Background technique [0002] In the design of contemporary communication and navigation systems, according to different application requirements, it is often necessary to simultaneously broadcast composite messages meeting different requirements in the same frequency signal. For example, the basic message is broadcast at a certain information rate to meet the system’s basic service performance or public service performance requirements, while the extended message with the same or different information rate is broadcast to meet the system’s additional service performance or non-public service performance requirements. Since the extended message signal may not be fully disclosed, the system requires the design of the composite message signal to ensure that ...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04L27/20G01S19/03
CPCH04B1/707H04L27/20G01S19/03
Inventor 王盾陈耀辉李申阳陈思源李东俊董启甲
Owner SPACE STAR TECH CO LTD
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