A Joint Estimation Method of Frame Bit Synchronization for EBPSK Communication System

Abstract

The invention discloses a simultaneous frame and bit combined estimation method for an EBPSK (extended binary phase shift keying) communication system. The method comprises the steps: framing sending data at a transmitting end, and then performing EBPSK modulation; sending a receiving signal into an impact filter at a receiving end, and converting the receiving signal into parasitic amplitude modulation impact at a code element '1'; performing down sampling on output data of the impact filter according to a relative relation with a baseband code element rate; calculating peak values of 13 continuous data points of each group in a data stream subjected to down sampling, marking the moment that the peak values are greater than a certain threshold value, calculating a relevance value to a frame header, and marking the moment, in which four times of the peak value is smaller than the relevance value, in the marked moments; searching the first peak value of the relevance value in the marked moment in the step, wherein the moment corresponding to the first peak value is a synchronous moment. According to the simultaneous frame and bit combined estimation method, frame and bit are simultaneously finished by one step, so that the synchronization efficiency is improved, the synchronization precision is improved, the demodulation performance is high, the synchronization expense is reduced, the transmission efficiency is high, the hardware expenses are reduced, and the receiving machine implementation cost is reduced.

Description

technical field [0001] The invention belongs to the field of information modulation and demodulation in digital communication, and relates to a method for estimating frame synchronization and bit synchronization, in particular to a joint estimation method for frame bit synchronization used in an EBPSK communication system. Background technique [0002] 1. Asymmetric binary phase shift keying [0003] Spectrum is a non-renewable resource that bears various growing wireless services and is precious to all countries in the world, as can be seen from the huge bidding price of limited frequency usage rights in Europe. How to use limited spectrum resources more efficiently is also crucial to the sustainable development of my country's modernization drive. [0004] The spectrum utilization rate of the digital communication system can be evaluated by the digital rate (in bps / Hz) that can be transmitted within the unit frequency band, which mainly depends on the frequency bandwidth ...

AI Technical Summary

Problems solved by technology

This method of separately estimating bit synchronization and frame synchronization not only wastes valuable useful information, especially for small data packet transmission applications such as burst communication and power line carrier communication, but also increases the algorithm complexity and hardware complexity of the receiver.

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