32APSK modulation system receiver synchronization method

Abstract

The invention provides a 32APSK modulation system receiver synchronization system, and belongs to the technical field of wireless communication. The invention aims to provide an all-digital receiver synchronization scheme which is high in synchronization precision and low in algorithm complexity. The method is realized through the following scheme: a high-speed ADC module performs high-speed sampling on a received intermediate-frequency analog signal, and a digital orthogonal down-conversion module completes orthogonal down-conversion and low-pass filtering of an intermediate-frequency digitalsignal to obtain an IQ orthogonal signal; the matched filtering module completes matched filtering of a receiving end filter and a sending filter; the bit synchronization module completes timing synchronization of signals; the carrier synchronization module extracts local oscillation with the same frequency and the same direction of the carrier, removes the carrier, and performs phase ambiguity resolution operation by using the phase ambiguity information fed back by the frame synchronization module; the frame synchronization module gives out phase ambiguity information, after carrier synchronization and bit synchronization signals are equalized by the equalization module, the phase ambiguity information is fed back to the carrier synchronization module for phase ambiguity resolution, anda synchronization bit stream is demodulated and output.

Description

technical field [0001] The invention belongs to the field of high-order modulation and demodulation in wireless digital transmission, and particularly relates to an all-digital receiver synchronization scheme suitable for 32APSK modulation system. [0002] technical background [0003] With the continuous advancement of information technology, more and more new applications are emerging rapidly, such as: Internet of Things, unmanned driving, high-definition satellite digital TV, artificial intelligence, etc. The stable operation of these services must be guaranteed by a high-speed and efficient communication system, and as the communication requirements of these devices / applications continue to grow, the requirements for information processing and transmission rates are getting higher and higher. It can be seen from Shannon's theorem that to increase the information transmission rate, two methods can be adopted: increasing the transmission bandwidth and improving the utilizat...

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Problems solved by technology

Both methods need to change the phase of the local clock in a timely manner, which is not conducive to the realization of high-speed digital signals and the degree of integration is low

[0005] Since the transmission rate of satellite communication is often as high as Gbps or more, too slow locking will lead to the loss of a large amount of effective information, so the receiver must complete fast and stable synchronization in a short time

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