An incoherent spread spectrum communication apparatus with variable data rate

Abstract

The invention discloses a non-coherent spread spectrum communication device with variable data rate, which relates to realizing non-coherent spread spectrum modulation and demodulation data transmission with variable data rate bit by bit, configurable spread spectrum code rate, strong anti-Doppler performance and fast synchronization speed under the condition of low signal-to-noise ratio. Frequency sweep, parallel partial coherence and incoherent accumulation are used to realize the fast acquisition of incoherent spread spectrum signals with large frequency offset range, and digital average filter and square filter are used to achieve symbol timing synchronization of incoherent spread spectrum signals. The invention has high integration degree, strong portability, light weight and low power consumption, small commissioning workload of the whole machine, simple and flexible interface, easiness in expanding, and stable and reliable performance, the circuit is integrated in a 292mm long,185mm wide and 28mm high square terminal, weighing 0.6 kg, which is especially suitable for the application of non-coherent spread spectrum modulation and demodulation channel transmission terminal inairborne satellite communication system with limited volume and weight.

Description

technical field [0001] The invention relates to a non-coherent spread spectrum communication device with variable data rate in a satellite communication system, belonging to the technical field of satellite relay communication. It is especially suitable for being used as a signal receiving and transmitting device in an airborne satellite relay communication system. Background technique [0002] The spread spectrum system has the advantages of strong anti-interference ability, good confidentiality, easy networking, strong anti-multipath and fading ability, multiple access capability and high-precision ranging ability, etc., no matter in the field of communication or navigation ranging fields have been widely used. Non-coherent spread spectrum is a special case of spread spectrum. In non-coherent spread spectrum system, information data clock and spread spectrum code clock are non-homologous clocks. In the satellite relay communication application system, while ensuring the ...

AI Technical Summary

Problems solved by technology

Incoherence brings greater flexibility, but at the same time puts forward higher requirements for the design of communication devices

Especially in the case of low signal-to-noise ratio, the reception of incoherent spread spectrum signals cannot be effectively demodulated by conventional methods. Doppler frequency offset also puts forward higher requirements for the design of communication devices

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