Spread spectrum communication system with acoustic surface wave correlator

Abstract

The invention relates to a spread spectrum communication system with an acoustic surface wave correlator. A baseband signal is in N-ary coding. Spread spectrum codes adopted in the system are N compatible code members of the same group of compatible codes; each compatible code corresponds to an N-ary code element; and the spread spectrum codes are generated and received by using the acoustic surface wave correlator. An emitting unit of the system comprises a pulse emitting unit, a code element recognition unit and N emitting end SAW (Surface Acoustic Wave) correlators; a receiving unit comprises N paired receiving end SAW correlators and an output recognition module; the N paired emitting end SAW correlators are used for correspondingly and directly spreading baseband narrow-band N-ary coded digital signals one by one into high-frequency broadband compatible code pulse link electric waves which can be emitted directly; and the N paired receiving end SAW correlators are used for correspondingly and directly demodulating the received high-frequency broadband compatible code pulse link electric waves one by one into the baseband narrow-band N-ary coded digital signals. The invention has the advantages that: the quantity N of baseband coding elements is not limited; the system has high security performance and a large quantity of standby compatible code blocks, and the used code blocks can be changed at any time; and due the adoption of the SAW correlator, the system has a simple structure.

Description

technical field [0001] The invention relates to a spread spectrum communication system, in particular to a spread spectrum communication system using a surface acoustic wave correlator, which belongs to the technical field of wireless communication. Background technique [0002] Nowadays, wireless communication has penetrated into all aspects of our daily life. Mobile phones, Bluetooth headsets, wireless keyboards and mice, and WiFi stations are all achievements of modern wireless communication. The pursuit of faster, more and better information transmission is the eternal driving force for the development of wireless communication technology. [0003] Spread spectrum communication is the abbreviation of spread spectrum communication. It refers to the communication system in which the radio frequency bandwidth used to transmit information is 10 to 100 times the information bandwidth, and the transmission bandwidth is mainly determined by the spread spectrum code sequence pr...

AI Technical Summary

Problems solved by technology

[0010] At present, the problems existing in spread spectrum communication technology are: (1) The address code pattern and rate are directly related to the signal spectrum and interference between signals, so how to select the address code is usually a special research topic; (2) ) Due to the use of broadband radio frequency signals, attention should be paid to the modulation method and the requirements for modulators and demodulators; (3) The receiver must determine the signal address code phase and carrier frequency to demodulate the signal, so good synchronization is required; (4 ) The development and adoption of new devices and components (such as matched filters, frequency synthesizers and microcomputer control, etc.) play an important role in improving equipment performance

Firstly, the structure of the whole communication system is relatively complex; secondly, the number of baseband encoding primitives is limited, which is not suitable for multi-ary encoding; thirdly, there are few alternative code groups, and the confidentiality performance is not high

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