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Channel estimation-based timing synchronization method for orthogonal frequency division multiplexing (OFDM) system

A system timing and channel estimation technology, applied in baseband system components, synchronization devices, transmission systems, etc., can solve problems such as inability to achieve accurate detection

Active Publication Date: 2014-09-03
CHONGQING UNIV
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Problems solved by technology

[0005] Literature [2]: Yang F, Zhang X. Robust Time-Domain FineSymbol Synchronization for OFDM-Based Packet Transmission Using CAZAC Preamble [C]. MILCOM Military Communications Conference-ce, 2013: 436-440. Also disclosed a OFDM The system timing synchronization algorithm, which we will refer to as "Yang method" for short in the following text, uses CAZAC sequence with zero autocorrelation characteristics of the banner to eliminate the secondary peak and make the threshold range adjustable, but when the first path fading is seriously lower than the threshold, Unable to achieve accurate detection

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  • Channel estimation-based timing synchronization method for orthogonal frequency division multiplexing (OFDM) system
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  • Channel estimation-based timing synchronization method for orthogonal frequency division multiplexing (OFDM) system

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[0036] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0037] Such as figure 1 Shown, a kind of OFDM system timing synchronization method based on channel estimation is carried out according to the following steps:

[0038] Step S1, use the coarse synchronization algorithm to obtain the coarse synchronization timing point d c ;

[0039] First construct two repeated sequences through the Schmidl algorithm, let C(2k) be the PN sequence on the even subcarrier in the frequency domain, C(2k+1)=0, where 0≤k≤A-1, then the training sequence at the sending end ( excluding CP) can be expressed as c ( n ) = 1 N Σ k = 0 A - 1 C ( 2 ...

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Abstract

The invention discloses a channel estimation-based timing synchronization method for an orthogonal frequency division multiplexing (OFDM) system, belongs to the technical field of communication, and mainly solves the problems that a timing error exists in the system when a first path of a multi-path fading channel is not the strongest path, and the existing fine synchronization algorithm is large in leak detection probability. By adopting the method, channel impulse response is determined in fine synchronization by adopting the least squares algorithm on the basis of locating coarse synchronization on the path with the strongest energy, the position of each path is judged by energy change inside a sliding window on the basis of ring shift right characteristic, and the first path is detected by adopting the minimal value or a self-adapting threshold method. By adopting the method, the leak detection probability of accurate symbol synchronization can be reduced, and the timing property of the system is effectively improved.

Description

technical field [0001] The invention relates to OFDM system timing synchronization technology, in particular to a channel estimation-based OFDM system timing synchronization method, which belongs to the field of communication technology. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing technology) is widely used in high-speed wireless transmission systems due to its high spectrum utilization rate and strong anti-multipath fading capability. Timing synchronization is one of the key issues in OFDM systems, and there have been a lot of researches on it. [0003] In the prior art, most people solve the peak plateau phenomenon of timing measurement by improving the training symbol structure and using related characteristics, and at the same time eliminate the influence of sub-peaks, so that the timing is more accurate. However, its coarse synchronization algorithms are all based on energy detection. In a m...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04L7/00
Inventor 吴玉成周杰杨毅许炜阳李有均王雨晴明虹
Owner CHONGQING UNIV
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