Carrier frequency offset estimation method and device, and computer readable storage medium

A carrier frequency offset and computer program technology, applied in the field of communication, can solve the problems of signal overflow, the receiver cannot accurately demodulate, and the carrier frequency offset cannot be calculated, and the effect of improving the estimation accuracy is achieved.

Pending Publication Date: 2021-12-24
SHANGHAI EASTSOFT MICROELECTRONICS
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Problems solved by technology

[0006] However, when the carrier frequency offset is large, the signal overflow of the phase detection output may occur (the phase is greater than π or less than -π), at this time, the existing carrier frequency offset estimation method cannot calculate the carrier frequency offset, which leads to Receiver cannot demodulate accurately

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  • Carrier frequency offset estimation method and device, and computer readable storage medium
  • Carrier frequency offset estimation method and device, and computer readable storage medium
  • Carrier frequency offset estimation method and device, and computer readable storage medium

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Embodiment Construction

[0030] refer to figure 1 , gives the signal waveform obtained by an existing direct phase detection method. figure 1 In , the abscissa is the number of sampling points, the ordinate is the phase difference, and the unit of the ordinate is π. Depend on figure 1 It can be seen that if the modulation frequency is positive, the phase difference is positive; if the modulation frequency is negative, the phase difference is negative. figure 1 The signal obtained in is an ideal signal in which there is no DC component.

[0031] refer to figure 2 , the signal waveform obtained by another existing direct phase detection method is given. figure 2 In , there is a DC component in the signal output by direct phase detection. Before the demodulation decision is made, carrier frequency offset estimation and compensation can be performed on the signal directly output by phase detection.

[0032] However, when the carrier frequency deviation is large, the DC component plus the frequency...

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Abstract

The invention discloses a carrier frequency offset estimation method and device, and a computer readable storage medium. The carrier frequency offset estimation method comprises the following steps: acquiring a target area where a signal output by phase discrimination is located, wherein the target area is one of N candidate areas, the union set range of the N candidate areas is [pi, -pi], and N is greater than or equal to 2; according to the target area, obtaining a first estimation value of a direct current component corresponding to the signal output by phase discrimination; and carrying out carrier frequency offset compensation on the signal output by phase discrimination by adopting the first estimation value of the direct current component. Through operation processing of the first estimation value of the direct current component, more accurate calculation of carrier frequency offset and effective supplement are realized. According to the scheme, the carrier frequency offset can still be calculated under the condition that the signal output by phase discrimination overflows, so that the demodulation accuracy of a receiver is improved.

Description

technical field [0001] Embodiments of the present invention relate to the field of communication technologies, and in particular, to a carrier frequency offset estimation method and device, and a computer-readable storage medium. Background technique [0002] Frequency-Shifting Keying (FSK) uses changes in carrier frequency to transmit effective digital signals. Since the symbol jumps between 0 and 1, there will be phase discontinuity when the symbol jumps, causing spectrum expansion. In order to overcome spectrum expansion and further reduce the bandwidth of communication signals, Gauss Frequency-Shifting Keying (GFSK) has become a commonly used modulation method. [0003] Due to requirements such as low cost and low power consumption, usually, a non-correlated demodulation method is used to demodulate the GFSK or FSK signal. Non-coherent demodulation methods include direct phase detection methods, cross-correlation detection methods, and differential detection methods. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026H04L27/14H04L2027/0028
Inventor 沈力为陈光胜潘松
Owner SHANGHAI EASTSOFT MICROELECTRONICS
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