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Orthogonal frequency division multiplexing symbol timing synchronization method used for the multi-path fading channel environment

A technology for multipath fading channel and symbol timing synchronization, which is applied in the field of OFDM systems, and can solve the problem of not giving a timing estimation implementation method.

Inactive Publication Date: 2007-10-17
SOUTHEAST UNIV
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Problems solved by technology

Since this function independently observes the correlation between each sampling point and its corresponding delay point, it can effectively divide the range of the starting point of the effective sampling window without intersymbol interference, but the above technical literature does not give a specific implementation method for timing estimation

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  • Orthogonal frequency division multiplexing symbol timing synchronization method used for the multi-path fading channel environment
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  • Orthogonal frequency division multiplexing symbol timing synchronization method used for the multi-path fading channel environment

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[0045] The technical solution of the present invention is described in further detail below in conjunction with specific examples: the present embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures have been provided, but protection scope of the present invention It is not limited to the following examples.

[0046] The present embodiment is a 1.25MHz bandwidth OFDM system; each subcarrier adopts QPSK modulation; the system Fast Fourier Transform point N is 128; the number of subcarriers used for data transmission is 76; a pilot symbol is inserted every 5 symbols; the sampling frequency is 1.92MHz; the length L of cyclic prefix sampling points is 32; the channel model is a modified Jakes model, and the delay power spectrum parameters are the vehicle parameters of the M.1225 channel A model. An OFDM symbol length (N+L) is 160 samples, and the received signal is the sup...

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Abstract

A synchronous method of orthogonal frequency division multiplexing symbol timing for multi-path fading channel environment, which is specially used for the OFDM system under the multi-path fading channel environment. Concretely, it includes following steps: 1) judging time range of the window starting point of effectively sampling for non-symbol interference in receipt signal; 2) processing preliminary sampled signal, using it to recover the OFDM signal; 3) obtaining the symbol timing estimate by coherent detection. The invention can effectively confront the inter-symbol interference produced by the multi-path fading, and can obtain comparatively accurate timing estimate under low SNR condition, which solves the problem of lowered synchronization property caused by the disrupted dependence of circulation prefix for complex channel environmental low system's SNR in prior art.

Description

technical field [0001] The invention provides an orthogonal frequency division multiplexing (OFDM) symbol timing synchronization method, which is used in an OFDM system under a multipath fading channel environment, and the invention relates to the field of digital mobile communication. Background technique [0002] In the current research on digital mobile communication systems, people have paid more and more attention to the "post-third generation" mobile communication system, which can accommodate a large number of users, improve the existing communication quality, and achieve high-speed data transmission requirements. In the "post-third generation" mobile communication system, Orthogonal Frequency Division Multiplexing (OFDM) technology has attracted much attention due to its advantages of high spectrum utilization, low cost, and easy implementation, and is expected to become the "third generation" mobile communication system. The mainstream technology after communicatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 王炎高燕尤肖虎
Owner SOUTHEAST UNIV
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