Frequency offset estimation method for wireless communication to adapt to AGC adjustment in HPLC dual-mode communication
A frequency offset estimation and wireless communication technology, which is applied in carrier regulation, wired transmission system, modulated carrier system, etc. It can solve the problems of large estimation error, large estimation error, affecting system communication performance, and poor performance of high signal-to-noise ratio solution. , to avoid adjustment effects, improve communication performance, and improve estimation accuracy
Active Publication Date: 2021-08-06
深圳市力合微电子股份有限公司
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[0005] The purpose of the present invention is to solve the problem that the frequency offset estimation method in the prior art will be affected by the AGC adjustment, resulting in the possibility that the estimation error of the carrier frequency deviation of the signal with a high signal-to-noise ratio is larger than the estimation error of the low signal-to-noise ratio, resulting in high The performance of the signal-to-noise ratio is worse, which affects the communication performance of the system
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[0042] The present invention will be further described below with reference to the accompanying drawings and in combination with preferred embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
[0043] Such as figure 1 A method for estimating a frequency offset in which wireless communication adapts to AGC adjustment in HPLC dual-mode communication in this embodiment includes the following steps:
[0044] S1. According to the coarse synchronization position, take out the STF data of 5 FFT lengths from the starting position of the STF;
[0045] The STF data of 5 FFT lengths comes from the SHR (Synchronization Header) field, and the SHR field is composed of STF data of 5 FFT lengths and LTF (Long Training Field) data of 2.5 FFT lengths, such as figure 2 As shown, the FFT length is 16×2 n (n takes values 0, 1, 2, 3). According to the structure of the ...
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The invention provides a frequency offset estimation method for wireless communication to adapt to AGC (Automatic Gain Control) adjustment in HPLC (High Performance Liquid Chromatography) dual-mode communication, which comprises the following steps of starting to take out STF data with five FFT (Fast Fourier Transform) lengths from the starting position of an STF according to a coarse synchronization position; dividing the extracted STF data into five segments; counting the percentage of overflowing data points of each section; calculating the average power of the five sections of STF; according to a set overflow percentage and a non-overflow power threshold, judging a data segment influenced by AGC; taking out the STF symbols again according to the judgment result; calculating frequency offset by using the taken symbols; and correcting the data by using the calculated frequency offset. The method can adapt to the influence of AGC adjustment, not only ensures that more symbols are used for evaluating the frequency offset and improving the estimation accuracy under the low signal-to-noise ratio, but also takes less symbols under the high signal-to-noise ratio, avoids the influence of AGC adjustment and improves the carrier frequency offset estimation performance, thereby improving the communication performance of the system.
Description
technical field [0001] The invention relates to the field of power wireless communication, in particular to a frequency offset estimation method for wireless communication adapting to AGC (Automatic gain control) adjustment in HPLC (low-voltage power line high-speed carrier) dual-mode communication. Background technique [0002] In the wireless communication system, the physical layer frame usually sets the training sequence in the frame header part, which is used for carrier frequency deviation estimation, channel estimation, etc. In the HPLC (High-Speed Power Line Communication, abbreviated as HPLC) dual-mode communication, wireless OFDM (Orthogonal Frequency Division Multiplexing, abbreviated as OFDM) communication, carrier frequency deviation estimation is a key step in physical layer signal processing. Carrier frequency deviation will cause interference between subcarriers in the OFDM system, which will seriously restrict communication performance. [0003] The length...
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IPC IPC(8): H04L27/00H04B3/54
CPCH04L27/0014H04B3/542H04L2027/0026
Inventor 陈丽恒姜光兴刘元成刘鲲
Owner 深圳市力合微电子股份有限公司