High-precision frequency offset estimation method suitable for low signal-to-noise ratio environment

A technology of frequency offset estimation and low signal-to-noise ratio, applied in multi-frequency code systems, digital transmission systems, electrical components, etc., can solve the problems of IQ imbalance and inapplicability, and achieve the effect of accurate estimation accuracy

Active Publication Date: 2016-06-15
SHANGHAI INTERNET OF THINGS
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Problems solved by technology

In addition, Lanante and Hai et al. proposed an estimation method suitable for dealing with zero-IF receivers for the characteristics of IQ imbalance, but it is not applicable in the case of low signal-to-noise ratio

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  • High-precision frequency offset estimation method suitable for low signal-to-noise ratio environment
  • High-precision frequency offset estimation method suitable for low signal-to-noise ratio environment
  • High-precision frequency offset estimation method suitable for low signal-to-noise ratio environment

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Embodiment Construction

[0030] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0031] The present invention provides a high-precision frequency offset estimation method suitable for a low signal-to-noise ratio environment. A specific embodiment in DSSS system communication will be described in detail below with reference to related drawings.

[0032] After down-conversion, the received signal with carrier frequency offset is:

[0033] s ( k ) ...

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Abstract

The invention relates to a high-precision frequency offset estimation method suitable for a low signal-to-noise ratio environment. The high-precision frequency offset estimation method suitable for the low signal-to-noise ratio environment comprises the following steps: multiplying a received signal by a corresponding synchronization code, thereby obtaining a pseudo code information canceling sequence; performing an autocorrelation preprocessing on the pseudo code information canceling sequence to increase the signal-to-noise ratio of the sequence; performing computation on the preprocessed sequence, thereby obtaining all-order difference accumulation signals, and obtaining multi-order carrier frequency offset signals; estimating a frequency offset by utilizing multi-order carrier phase information based on a minimum mean square error. The high-precision frequency offset estimation method suitable for the low signal-to-noise ratio environment is applicable to a communication scenario with the ultra-low receiving sensitivity.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a high-precision frequency offset estimation method adapted to a low signal-to-noise ratio environment. Background technique [0002] Carrier frequency synchronization is a key technical issue in the field of wireless communication, especially in applications such as wireless sensor networks with bursty communication characteristics, where there is a lack of synchronization channels or prior knowledge to assist carrier frequency synchronization. At the same time, due to cost constraints, an ordinary crystal oscillator with poor frequency accuracy is generally selected, and the frequency deviation is as high as 40PPM or more. The existence of carrier frequency offset will greatly reduce the transmission performance of the system. Therefore, frequency offset estimation has become an indispensable key technology in wireless communication systems. [0003] For the pe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/38
CPCH04L27/266H04L27/2688H04L27/3854
Inventor 罗炬锋叶晓青施玉松尚素绢汪涵刘衍青周静邱云周郑春雷
Owner SHANGHAI INTERNET OF THINGS
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