Incoherent spread spectrum digital transceiver instantaneous frequency measurement and demodulation method

Abstract

The invention discloses an incoherent spread spectrum digital transceiver instantaneous frequency measurement and demodulation method. The instantaneous frequency measurement and demodulation method is low in algorithm realization complexity and is multistation interference resistant. The method is realized through the following technical scheme that an incoherent reception algorithm module captures Doppler frequencies and code phases, detects sample data of an analog-to-digital converter through synchronization headers and finishes synchronization header correlation detection; an instantaneous frequency measurement module and a digital downconversion module eliminate Doppler through near-real-time ms magnitude Doppler frequency difference measurement and compensation, decimation filteringand matching filtering are carried out through an IDF decimation filter, sign bits of I and Q data are directly obtained, the data is changed into single bits for follow-up processing, incoherent demodulation and RS decoding are finished, and user data is output; and a spread spectrum transmitting algorithm module carries out framing, RS coding, differential coding and direct sequence spread spectrum processing on the user data, then carries out sign mapping and modulation on the user data, sends the user data to a DAC for digital-to-analogue conversion, and the DAC filters the user data through a double end to single end transformer and a second filter and outputs instantaneous frequency measurement and demodulation signals.

Description

technical field [0001] The present invention is mainly used in the fields of low-cost short-distance wireless formation or cluster measurement and control or low-speed data transmission, and provides a low-cost, anti-interference between multiple nodes, small size and light weight spread spectrum digital transceiver for short-distance wireless formation systems below 10km machine. technical background [0002] Any digital communication system is the transmission of discrete signals, requiring the signals at both ends of the transmitter and receiver to be identical in frequency and phase in order to correctly demodulate information. Spread spectrum communication systems are no exception. In a coherent spread spectrum digital communication system, the receiving end and the transmitting end must realize information symbol synchronization, PN code symbol and sequence synchronization, and radio frequency carrier frequency synchronization. Only when these synchronizations are re...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a non-coherent spread spectrum digital transceiver with small volume, light weight, low cost, low algorithm implementation complexity and anti-multi-station interference for the disadvantages of high cost and high algorithm complexity in the prior art. Machine instantaneous frequency measurement and demodulation method to solve the problem of wireless short-distance remote control and digital transmission instantaneous frequency measurement and demodulation

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