Frequency offset estimation method and device
A frequency offset estimation, complex number technology, applied in the field of communication, can solve the problems such as the relative phase difference of sampling points is not a fixed value, time-varying frequency offset, signal demodulation error and so on
Pending Publication Date: 2022-02-18
TELINK SEMICON SHANGHAI
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Problems solved by technology
[0004] Due to the location movement of the receiving device, the change of the environment where the receiving device is located, and the unstable factors of the hardware working state of the receiving device, it will cause time-varying frequency offset
This further leads to the fact that the relative phase difference between sampling points is not a constant value
Failure to respond to this time-varying frequency offset in time will result in signal demodulation errors
Method used
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[0023] In the present application, it should be understood that terms such as "including" or "having" are intended to indicate the presence of the disclosed features, numbers, steps, behaviors, components, part, or combinations of the present specification, but do not exclude presence One or more other features, numbers, steps, behaviors, components, part, or combinations thereof exist.
[0024] It is also necessary to explain that features in the embodiments and embodiments in the present application can be combined with each other in the case of unlafred. The present application will be described in detail below with reference to the accompanying drawings.
[0025] The present application will be further described below with reference to the embodiments shown in the drawings.
[0026] The inventor of this application finds that reference image 3 , The complex sampling point is in the process of moving, such as no frequency offset or frequency offset, for any selected plural samp...
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The invention provides a frequency offset estimation method and device. According to the method, a pair of complex sampling points symmetrical about the number of a midpoint P in continuous (2D + 1) complex sampling points are sequentially selected for frequency offset estimation, a frequency offset estimation value delta fj is obtained based on vectors formed by a pair of complex sampling points as end points, j belongs to [0, D), and j is the number of the frequency offset estimation value; and weighted summation is performed on the D frequency offset estimation values to obtain a frequency offset estimation value corresponding to a time period in which continuous (2D + 1) complex sampling points are located, the sum of weighting coefficients being 1. According to the method, the time-varying frequency offset can be estimated in time, and the operand is low.
Description
Technical field [0001] The present application is in the field of communication technology, and more particularly to a frequency offset estimation method and apparatus. Background technique [0002] figure 1 The classic digital signal modulation process is shown. The transmitter maps binary data to the constellation point on the preset modulated constellation map through the digital modulation circuit (the real part is represented by q). The complex signal is then transmitted to the wireless channel in the form of analog electromagnetic waves through a radio frequency transmit circuit. After the receiver receives the electromagnetic wave, convert the analog electromagnetic wave into a plurality of signal sampling points through the RF receiving circuit, and the complex signal sampling point passes the digital demodulation, and the binary data is resumed using the same modulation constellation. [0003] In the actual transceiver, the switching process between the constellation po...
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IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026
Inventor 顾晓闻
Owner TELINK SEMICON SHANGHAI