A frequency offset estimation method for wireless communication adapting to AGC adjustment in HPLC dual-mode communication
A technology of wireless communication and frequency offset estimation, which is applied in the direction of carrier adjustment, wired transmission system, modulated carrier system, etc. It can solve the problems of affecting system communication performance, large estimation error estimation error, and poor performance of high signal-to-noise ratio solution , to achieve the effect of improving communication performance, avoiding adjustment effects, and improving estimation accuracy
Active Publication Date: 2022-06-10
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 conjunction with the preferred embodiments. It should be noted that in
[0047] The STF data taken out is evenly divided into 5 segments.
[0048]
[0051] OVER
[0052] In the above formula, N is the ADC bit width, and ADJ is an adjustable value, and the overflow limit can be adjusted by adjusting the value.
[0053]
[0055]
[0056] The 5-section STF data is counted according to the above formula, and the 5-section STF overflow data ratio is calculated.
[0059]
[0060] Calculate the power of the 5-stage STF according to the above formula.
[0062] According to the set overflow percentage and the non-overflow power threshold, determine the data segment affected by the AGC. set overflow
[0063]
[0064]
[0065] STF
[0068]
[0070]
[0077]
[0078] In the formula, angle is the phase of the complex number.
[0079]
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The present invention proposes a frequency offset estimation method for wireless communication adapting to AGC adjustment in HPLC dual-mode communication. segment; count the percentage of overflowed data points in each segment; calculate the average power of 5 segments of STF; judge the data segment affected by AGC according to the set overflow percentage and non-overflow power threshold; re-extract the STF symbol according to the judgment result; Calculate the frequency offset of the symbol; use the calculated frequency offset to correct the data. The present invention can adapt to the influence of AGC adjustment, which not only ensures that more symbols are used to evaluate the frequency offset under low signal-to-noise ratio, and improves the estimation accuracy, but also takes fewer symbols under high signal-to-noise ratio to avoid the influence of AGC adjustment, The carrier frequency deviation estimation performance is improved, thereby improving the communication performance of the system.
Description
A Frequency Offset Estimation Method for Wireless Communication Adapting to AGC Adjustment in HPLC Dual Mode Communication technical field The present invention relates to the field of electric power wireless communication, relate in particular to a kind of HPLC (low-voltage power line high-speed carrier) dual-mode communication A frequency offset estimation method adapted to AGC (Automatic Gain Control) adjustment for wireless communication in the letter. Background technique In the wireless communication system, the physical layer frame usually sets a training sequence in the frame header part, which is used for the carrier frequency offset [0002] Difference estimation, channel estimation, etc., in HPLC (High-Speed Power Line Communication, abbreviated as HPLC) dual-mode In wireless OFDM (Orthogonal Frequency Division Multiplexing, abbreviated as OFDM) communication, Carrier frequency offset estimation is a key step in physical layer signal processing, and carrie...
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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