Minimum shift keying/Gaussian Filtered minimum shift keying (MSK/GMSK) direct sequence spread spectrum signal receiver

Abstract

The invention discloses a minimum shift keying / Gaussian Filtered minimum shift keying (MSK / GMSK) direct sequence spread spectrum signal receiver structure; a receiver comprises an antenna, a radio frequency front-end module, an analog-digital converter, a digital baseband module, a signal acquisition tracking control module and a data demodulation module, wherein the antenna outputs a received signal to the radio frequency front-end module; the radio frequency front-end module carries out frequency conversion, amplification and filtration to the received signal; the analog-digital converter converts the processed signal into a digital medium-frequency signal; the digital baseband module acquires and tracks the input signal based on the control of the signal acquisition tracking control module; and the data demodulation module demodulates the acquired and tracked signal. The receiver has the advantages of simple structure and convenience in realization, and is particularly applicable to demodulating data and meanwhile finding range through a spread spectrum signal.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to an MSK / GMSK direct sequence spread spectrum signal receiver, which adopts a local spread spectrum code generation technology with adjustable duty cycle to improve the performance of the receiver. Background technique [0002] Minimum frequency shift keying MSK is a phase continuous frequency shift keying. Gaussian minimum frequency shift keying GMSK is a method that further reduces the signal side lobe power through the Gaussian filter through the MSK signal, reduces the transmission bandwidth and suppresses out-of-band interference. Modulation method, because MSK / GMSK has the characteristics of continuous phase and bandwidth saving, it is widely used. Direct sequence spread spectrum is to combine the data with the pseudo-random sequence and then modulate the carrier. When receiving, the same pseudo-random sequence is generated locally and multiplied and accumulated by the ...

AI Technical Summary

Problems solved by technology

At present, the general MSK / GMSK receiver is more considered from the perspective of receiving data, the structure is complex, and the ranging function of the direct sequence spread spectrum signal is not considered.

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