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

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

Inactive Publication Date: 2005-11-23
SOUTHEAST UNIV
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  • Application Information

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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

Examples

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Embodiment Construction

[0025] Assume that the system has M receiving antennas. The received signals from antenna 1 to antenna M are sampled twice, A / D converted, and then sent to each matched filter for correlation calculation. The output of the matched filter is sent to the N times interpolator for interpolation, so as to obtain the 2N times oversampling correlation value, and then the 2N times oversampling correlation value of the M antennas is sent to the two-dimensional energy window calculation 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 faded. The expression of the received signal of antenna m after sampling 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 method for timing synchronization applied to a wireless communication system, and belongs to the technical field of synchronization in mobile communication. Background technique [0002] Timing synchronization is a prerequisite for normal communication in a mobile communication system. In order to support high-speed data services, the future mobile communication system will be a broadband, multiple (receiving, transmitting) antenna system, the signal bandwidth will be much larger than the channel coherent bandwidth, so the system has the ability to distinguish multipath. In traditional receivers, the signal-carrying energy 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 signals, the timing synchroni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00H04L7/02
Inventor 潘志文高西奇尤肖虎
Owner SOUTHEAST UNIV
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