A method and device for frequency offset estimation based on wifi system
A frequency offset estimation and calculation module technology, applied in the field of frequency offset estimation, can solve problems such as inaccurate accuracy and receiver performance loss, and achieve accurate initial frequency offset estimation results, increased phase difference combined gain, and good anti-noise characteristics Effect
Active Publication Date: 2021-01-05
BEIJING WINNER MICROELECTRONICS
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Problems solved by technology
If the signal-to-noise ratio is relatively high, the current initial frequency offset estimation technology is no problem; but when the signal-to-noise ratio is relatively low, the accuracy of the current initial frequency offset estimation technology is not accurate due to the influence of noise. Inaccurate initial frequency offset estimation results will cause subsequent frequency offset estimation and overall performance loss of the receiver
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[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0053] Below in conjunction with accompanying drawing, the present invention is described in further detail:
[0054] In the WIFI physical layer packet structure, STF has 10 repeated short symbols of 0.8us. The method and device for frequency offset estimation provided by the present invention aim at the problems existing in the background t...
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The invention discloses a frequency offset estimation method and device based on a WIFI system. The method comprises the following steps: calculating the frequency offset estimation result of two sampling points through employing the phase difference of the sampling points which are separated by one or more short code elements; and performing weighted summation on the calculated frequency offset estimation results of the plurality of two sampling points to obtain an initial frequency offset estimation result of the WIFI system. Not only is the phase difference between adjacent short code elements used for frequency offset estimation, but also the phase difference between non-adjacent code elements is used for frequency offset estimation, so that the phase difference combination gain is increased, the anti-noise characteristic is better, and the initial frequency offset estimation result is more accurate.
Description
technical field [0001] The present invention relates to the technical field of frequency offset estimation, in particular to a frequency offset estimation method and device based on a WIFI system. Background technique [0002] For a receiver in a communication system, the precision error of the sampling crystal oscillator will cause a frequency deviation, which will cause the overall performance loss of the receiver. After frequency offset estimation and frequency offset compensation in general receivers, the influence of frequency offset will be suppressed; however, due to channel environment and noise, frequency offset estimation may be inaccurate, so in the process of data demodulation, the inaccurate frequency offset It is estimated that it will directly affect the performance of the receiver, especially for systems with relatively long data frames, this problem is particularly prominent. [0003] For OFDM systems (11a / g / n, etc.) in WIFI, the same problem exists. In th...
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IPC IPC(8): H04L25/02H04L27/00
CPCH04L25/0202H04L27/0014H04L2027/0026
Inventor 庄亮梅张雄程晟
Owner BEIJING WINNER MICROELECTRONICS