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Downlink timing synchronization method and system based on timing deviation compensation

A technology of timing synchronization and downlink, applied in the direction of multi-frequency code system, etc., to achieve the effect of avoiding inter-symbol interference, reducing possibility, and improving bit error rate performance

Inactive Publication Date: 2010-08-11
BEIJING JIAOTONG UNIV
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Problems solved by technology

Based on the present invention, the intersymbol interference caused by multipath time delay can be effectively reduced or avoided, and the problem of symbol timing synchronization of multipath channels is solved

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  • Downlink timing synchronization method and system based on timing deviation compensation
  • Downlink timing synchronization method and system based on timing deviation compensation
  • Downlink timing synchronization method and system based on timing deviation compensation

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Embodiment Construction

[0042] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] The method of the present invention first adopts the autocorrelation of the received signal. Then, the timing offset compensation is performed on the sampling point corresponding to the maximum peak value of the correlation result; the FFT window is made as early as possible, and the starting time of the symbol is positioned within the range of the CP that is not interfered by multipath, thereby reducing or avoiding the multipath delay. The inter-symbol interference solves the symbol timing synchronization problem of multi-path channels. The technical solution adopted by the present invention to solve its technical problems is:

[0044] First, use the conjugate symmetric peak detection method to find the position of the st...

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Abstract

The invention discloses a downlink timing synchronization method and system based on timing deviation compensation. The method comprises the following steps of: detecting conjugate peak values to acquire relevant results; finding the highest peak value M0 and a sampling point moment d0 corresponding to the highest peak value in the relevant results; and forwards translating the sampling point moment d0 corresponding to the peak value, giving the sampling point number delta d of the timing deviation compensation, and then determining the symbol timing synchronization positions according to the sampling point moment d0 and the sampling point number delta d. The invention can effectively reduce or avoid the interference among symbols, caused by multi-path time delays, and solve the problem of the symbol timing synchronization of multi-path channels.

Description

technical field [0001] The invention relates to the technical field of IEEE802.16e system downlink synchronization, in particular to a downlink timing synchronization method and system based on timing deviation compensation. Background technique [0002] IEEE802.16e, as the air interface specification of the mobile broadband wireless access system, is regarded by the industry as the only next-generation broadband wireless technology that can compete with 3G. Orthogonal frequency division multiplexing (OFDM, Orthogonal frequency division multiplexing) technology converts high-speed data streams into multiple parallel low-speed data streams through serial-to-parallel conversion, and converts frequency-selective fading channels into multiple parallel flat fading channels. It has a strong ability to resist inter symbol interference (ISI, inter symbol interference), and has become one of the core technologies of the physical layer of the 802.16e system. Compared with single-carr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 韩东升杨维王薇
Owner BEIJING JIAOTONG UNIV
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