Bipolar CSK modulation composite message signal broadcasting method and device

Abstract

The invention discloses a composite message signal broadcasting method and device based on bipolar CSK modulation, and the method comprises the steps: carrying out the modulation of a basic message onan in-phase I branch, carrying out the BPSK-DSSS direct sequence spread spectrum of a serial data flow on the I branch after channel coding, and constructing an in-phase I branch baseband signal; modulating the extended message on an orthogonal Q branch, randomly taking one bit from an extended message modulation symbol after channel coding to form a serial data stream on the Q branch, forming aparallel data stream on the Q branch by other bits, carrying out BPSK-DSSS direct sequence spread spectrum on the serial data stream on the Q branch, and carrying out CSKDSSS direct sequence spread spectrum on the parallel data stream on the Q branch; wherein the two jointly construct an orthogonal Q-branch baseband signal; and carrying out carrier 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 multi-rate composite message signal, and broadcasting the multi-rate composite message signal.

Description

technical field [0001] The invention relates to a method and device for broadcasting a composite message signal based on CSK modulation, and belongs 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 the ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is how to further improve the efficiency of information transmission under the condition of limited signal power, while keeping the complexity of signal receiving and processing basically unchanged, and provide a signal with good multipath interference suppression performance. The broadcast method and device meet the requirements of communication and navigation systems for broadcasting multi-type composite message services

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