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Method and system for joint frequency offset estimation based on cyclic prefix

A frequency offset estimation and cyclic prefix technology, applied in baseband systems, baseband system components, transmission systems, etc., can solve the problem of low estimation accuracy, and achieve the effect of improving system performance and accuracy

Active Publication Date: 2022-04-01
上海微波技术研究所(中国电子科技集团公司第五十研究所)
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Problems solved by technology

However, the traditional frequency offset estimation algorithm based on cyclic prefix (CP) uses the entire CP to estimate, but it is more sensitive to the influence of multipath fading channel and time offset, resulting in low estimation accuracy.

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  • Method and system for joint frequency offset estimation based on cyclic prefix
  • Method and system for joint frequency offset estimation based on cyclic prefix
  • Method and system for joint frequency offset estimation based on cyclic prefix

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Embodiment Construction

[0100] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0101] The embodiment of the present invention provides a joint frequency offset estimation method based on cyclic prefix, refer to figure 1 As shown, the effective window lengths corresponding to different channel models are different, and the channel estimation value is used to estimate the first path position t1, the main path position t2, and the Cirlen window length is L_cirlen. According to the presence of a reference signal in a certain time slot, the time domain channel estimation value of the r...

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Abstract

The present invention provides a joint frequency offset estimation method and system based on cyclic prefix, which relates to the field of wireless communication technology. The method includes: Step S1: According to the different effective window lengths corresponding to different channel models, use the channel estimation value to estimate Out of the first path position, main path position and Cirlen window length; Step S2: Estimate the effective window length according to the first path position, main path position and Cirlen window length; Step S3: Select the symbol cyclic prefix CP part that needs frequency offset estimation and the The starting point and effective window length of the data corresponding to the cyclic prefix CP at the end of the symbol data; Step S4: Calculate the phase angle of the frequency offset estimation and the frequency offset estimation value based on the cyclic prefix CP, and perform frequency offset compensation on the data at the receiving end. The invention can improve the precision of frequency offset estimation and improve system performance.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular, to a joint frequency offset estimation method and system based on cyclic prefix. Background technique [0002] For wireless communication systems, due to the time-varying nature of the wireless channel, the Doppler frequency shift of the wireless signal during transmission, or the frequency deviation between the carrier frequency of the transmitter and the local oscillator of the receiver, will destroy the communication between OFDM systems. Orthogonality, which in turn leads to mutual interference between subcarriers, deteriorating system performance. In severe cases, it will cause the entire receiver to be paralyzed, and the network will be disconnected. Therefore, before signal detection, it is necessary to estimate the carrier frequency offset, and then perform corresponding correction and compensation at the receiving end to ensure receiver performance....

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L25/02
CPCH04L27/0014H04L25/0224H04L2027/0026
Inventor 黄静静吴垒
Owner 上海微波技术研究所(中国电子科技集团公司第五十研究所)
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