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Orthogonal Frequency Division Multiplexing (OFDM) system sampling frequency shift blind estimation method under multipath fading channel

A sampling frequency offset, multipath fading channel technology, applied in the field of communication, can solve the problems of performance impact, small SFO estimation range, unsatisfactory estimation performance, etc., and achieve the effect of overcoming frequency offset, good estimation performance, and improving estimation performance

Inactive Publication Date: 2013-05-08
XIDIAN UNIV
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Problems solved by technology

Arash Zahedi-Ghasabeh proposed a cyclostationary spectral analysis method to estimate the sampling frequency offset, but it needs to know the pilot information of the transmitting end, and the direct extraction will be affected by the attenuation and multipath fading channel caused by the sampling frequency offset, and SFO The estimation range is very small, and the frequency offset also has a certain impact on its performance
In summary, these studies have certain defects, and are not suitable for frequency-selective multipath fading channels in actual non-cooperative communication systems. Moreover, in the case of low signal-to-noise ratio, the estimation performance before time-frequency synchronization is not ideal
Therefore, the above methods are not suitable for application in actual non-cooperative communication systems

Method used

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  • Orthogonal Frequency Division Multiplexing (OFDM) system sampling frequency shift blind estimation method under multipath fading channel
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  • Orthogonal Frequency Division Multiplexing (OFDM) system sampling frequency shift blind estimation method under multipath fading channel

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with specific embodiments.

[0022] Please refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0023] Step 1, sample the received signal y(t) to obtain y[n];

[0024] Step 2, calculate the amplitude of the spectral function of the sampled signal y[n] and globally, search with large strides Maximum position [ α 1 , f 1 ] = max α , α ≠ 0 ( max f | S Y 1 α ( f ) | ) ;

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Abstract

An orthogonal frequency division multiplexing (OFDM) system sampling frequency shift blind estimation method under a multipath fading channel includes: according to features of stable circulation of OFDM signals with relevant pilot frequency, an improved spectral function overcomes fading brought by sampling frequency shift and data influenced by the multipath fading channel to estimate relative value points and estimate the sampling frequency shift according to cyclic spectrum value phase shift amount at a estimated value point. The OFDM system sampling frequency shift blind estimation method under the multipath fading channel can overcome influence of frequency shift, white gaussian noise and the multipath fading channel, makes full use of data by using jump transformation, and greatly improves estimate performance of sampling frequency shift of the OFDM system.

Description

【Technical field】 [0001] The invention belongs to the field of communication technology, in particular to a method for blindly estimating sampling frequency offset (SFO) of an OFDM system under a multipath fading channel, which can be used for sampling offset estimation of an OFDM system before time-frequency synchronization in a non-cooperative communication system. 【Background technique】 [0002] The multi-carrier technology represented by Orthogonal Frequency Division Multiplexing (OFDM) has been successfully applied in digital video broadcasting, digital audio broadcasting, digital subscriber line, wireless access network, power line communication, satellite communication and other fields. Anti-multipath, anti-narrowband interference performance and efficient spectrum utilization are hotspots in broadband wireless communication research. However, due to the incomplete matching of the crystal oscillators at the two ends of the transceiver and the influence of Doppler freq...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 李兵兵孙珺刘明骞曹超凤
Owner XIDIAN UNIV
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