GFSK baseband digital receiver and baseband synchronization and demodulation method of the GFSK baseband digital receiver

Abstract

The invention discloses a GFSK baseband digital receiver and a baseband synchronization and demodulation method of the GFSK baseband digital receiver. The receiver comprises a phase difference detection module, a frequency shift estimation module, a frequency shift compensation module, a matched filtering module, a direct current component estimation and removing module, a selector and a synchronization and demodulation module. According to the receiver and the method, DFT operation of a specific frequency point is carried out on code element envelope signals output through phase difference detection; whether there are leader sequence signals or not is judged; moreover a corresponding frequency shift is calculated; frequency compensation and matched filtering are carried out on follow-up baseband signals; code element envelope is output through difference detection; and at this time, the direct current component estimation and removing module and the synchronization and demodulation module of the backward stage start working. The receiver is equipped with a frequency shift estimation and compensation circuit, thus improving the performance of the receiver; signal demodulation and code element judgment are carried out in a phase domain; the symbol synchronization and sampling clock synchronization of the receiver are realized based on a counter; and the receiver is simple and reliable in structure and can adapt to various different data rates.

Description

technical field [0001] The invention relates to the digital receiver technology in the wireless radio frequency transceiver, in particular to a GFSK non-coherent digital receiver and its baseband synchronization and demodulation method. Background technique [0002] GFSK is Gaussian Frequency Shift Keying, which is a frequency modulation method. It has been widely used in digital communication because of its good power efficiency and spectrum utilization. General demodulation methods can be divided into coherent demodulation and non-coherent demodulation. For coherent demodulation, the receiver needs to recover the frequency and phase of the carrier signal. The performance of the coherent receiver is good, but the structure is more complicated. The implementation of non-coherent demodulation is simple, but the bit error rate performance is slightly worse. Limited to low power consumption and low cost, GFSK transceivers can be designed and implemented in the analog domain,...

AI Technical Summary

Problems solved by technology

The coherent receiver has good performance, but the structure is more complex

Non-coherent demodulation is simple to implement, but the bit error rate performance is slightly worse

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