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Timed synchronization method for two-dimensional energy window based on interpolation

A timing synchronization, energy window technology, applied in the direction of synchronization device, synchronization device, digital transmission system, etc., can solve problems such as hardware implementation difficulties, and achieve the effect of reducing implementation complexity, reducing time, and improving synchronization accuracy

Inactive Publication Date: 2004-09-01
SOUTHEAST UNIV
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Problems solved by technology

However, due to the large system bandwidth (up to 10-100MHz), such a high sampling rate and quantization bits will lead to extremely high data rates, making hardware implementation very difficult

Method used

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  • Timed synchronization method for two-dimensional energy window based on interpolation
  • Timed synchronization method for two-dimensional energy window based on interpolation
  • Timed synchronization method for two-dimensional energy window based on interpolation

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Embodiment Construction

[0025] Suppose the system has M receiving antennas. Received signals from antenna 1 to antenna M are sent to each matched filter for correlation calculation after 2 times sampling and A / D conversion. The output of the matched filter is sent to the N-times interpolator for interpolation, so as to obtain the correlation value of 2N times oversampling, and then the 2N times oversampling correlation value of M antennas is sent to the two-dimensional energy window operation module, which performs synchronous search and Judgment, output timing information.

[0026] The specific algorithm is described as follows.

[0027] The received signal of each antenna is the superposition of the multipath signal and noise after the transmitted signal has undergone fading. The expression of the received signal after sampling by antenna m can be written as:

[0028] r m ( kT s ) ...

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Abstract

The invention is a kind of time and synchronization method based on interpolation of two-value energy window in wireless communication system. The method is: (1) samples the received signal of M antennas with 2 times rate and carries on A / D conversion; (2) carries on match filter; (3) carries on interpolation to output, and acquires relative result of 2N times over-sample; (4) carries on incoherent merging to the result; (5) calculates the sum of each branch path energy in window, and compares with the threshold; if the window energy is bigger than the threshold, carries on step (7), otherwise, changes the position of window, and carries on threshold judgement again; (6) compares the energy of original window and current window, if the energy of new window is bigger than the one of original window, uses the new window to replace the original window, otherwise the energy of window maintains constant, repeats step (5) until finding the biggest energy window; (7) finds out the relative peak of the window, records the correspondent synchronous phase.

Description

technical field [0001] The invention is a timing synchronization method applied to a wireless communication system, which belongs to the technical field of synchronization in mobile communication. Background technique [0002] Timing synchronization is the prerequisite for the normal communication of the mobile communication system. In order to support high-speed data services, the future mobile communication system will be a broadband, multi-antenna (receiving, transmitting) system, and the signal bandwidth will be much larger than the channel coherent bandwidth, so the system has the ability to distinguish multipath. In a traditional receiver, the energy carried by the signal is detected for a single path, so as to obtain the timing information of this path. This timing synchronization detection algorithm can work well in Gaussian channels, but for multipath fading channels, since the receiver can distinguish multiple independent multipath signal...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04L7/02
Inventor 潘志文高西奇尤肖虎
Owner SOUTHEAST UNIV
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