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Frequency offset estimation method in GFSK receiver

A technology of frequency offset estimation and receiver, which is applied in the field of frequency offset estimation, can solve the problems affecting the estimation results, achieve high versatility, both calculation accuracy and low real-time calibration

Pending Publication Date: 2021-12-10
国芯科技(广州)有限公司
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Problems solved by technology

If the data has certain interference, it will also affect the estimation results

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  • Frequency offset estimation method in GFSK receiver
  • Frequency offset estimation method in GFSK receiver

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Embodiment Construction

[0023] A frequency offset estimation method in a GFSK receiver adopts the method of finding the extreme value and averaging, and calculates the deviation between the overall modulated waveform and the zero value by finding the effective extreme value in the demodulated waveform. This method will be described below.

[0024] Step (1) Find out the maximum value and minimum value when continuous bits, and the maximum value and minimum value when single bit in the modulated signal frequency after demodulation:

[0025] From the time-domain waveform of GFSK, it can be seen that the amplitude of the modulation signal is not a fixed value, and the absolute value of the corresponding amplitude in the modulation signal is basically the same for a single "1" or a single "0" of the baseband signal; while continuous "1" or continuous The magnitude of a "0", which is higher than a single "1" or a single "0".

[0026] In the frequency of the modulated signal after demodulation, every three...

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Abstract

The invention discloses a frequency offset estimation method in a GFSK receiver. The method comprises the following steps: firstly, finding out a maximum value and a minimum value at continuous bits and a maximum value and a minimum value at a single bit in a demodulated modulation signal frequency; then filtering processing is carried out on the two maximum values and the two minimum values respectively; and finally, averaging the filtering result of the maximum value and the filtering result of the minimum value in continuous bits, averaging the filtering result of the maximum value and the filtering result of the minimum value in single bit, and averaging the two average results once again to obtain a final result which is the frequency deviation value of the current received signal. The method can be applied to the whole receiving process, is not affected by data content, has high universality and can be compatible with a low-intermediate-frequency receiver and a zero-intermediate-frequency receiver at the same time. According to the method, frequency offset estimation is carried out by completely adopting an actual measurement result, and the accuracy is higher.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a frequency offset estimation method in a GFSK receiver. Background technique [0002] GFSK modulation is a modulation method that uses the baseband signal to modulate the carrier frequency. Therefore, the baseband signal itself is a signal of frequency dimension. In the receiver, the result of demodulation output is the signal of frequency dimension. Since the frequency of the local oscillator signal of the receiver and the local oscillator signal of the transmitter cannot be exactly the same, it is inevitable that there will be a slight deviation, and the direct impact is that the demodulated waveform has a certain DC offset. The decision circuit after the demodulation module performs processing based on the set threshold to restore the original data, and the DC offset of the demodulated data will greatly affect the signal decision. The worst possibility is that t...

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Application Information

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IPC IPC(8): H04L27/16H04L27/156
CPCH04L27/16H04L27/1563
Inventor 梁晓峰李啟彬陈智德
Owner 国芯科技(广州)有限公司
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