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A kind of signal synchronization method and device

A signal synchronization and signal technology, applied in digital transmission systems, electrical components, radio transmission systems, etc., can solve problems affecting channel smooth performance, system performance degradation, and equalizer performance reduction, so as to reduce complexity and ensure positioning The effect of precision

Active Publication Date: 2020-11-10
SANECHIPS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the above four situations, the first one is an ideal situation, which will not cause symbol positioning errors; the second one is the case where the difference from the ideal point is not too large, the introduced positioning deviation can be restored by the equalizer, but if the difference is large, It will affect the performance of channel smoothing, thereby reducing the performance of the equalizer; the third and fourth cases will introduce ISI and ICI, which will greatly reduce the system performance, so it should be avoided

Method used

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  • A kind of signal synchronization method and device
  • A kind of signal synchronization method and device
  • A kind of signal synchronization method and device

Examples

Experimental program
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Embodiment 1

[0030] like image 3 Shown embodiment the present invention provides a method for synchronizing signals, comprising:

[0031] Step S310, the self-correlation processing to delay the reception antenna of the brightest signal received at an automatic gain control AGC unit lock reception signal, the reception signal and reception signal path separate ways processed after a first time delay length corresponding reference threshold determined by comparing coarse synchronization is completed according to the comparison result of each group;

[0032] Step S320, the after coarse synchronization is completed, the received signal of the brightest local cross-correlation process, the results of each channel of a local cross-correlation process of accumulating and weighting filtering, searching a maximum value from the filtered signal, to a maximum value in the search fine synchronization is completed is determined.

[0033] In one embodiment, the antenna for any one receiver to the received s...

example 1

[0083] like Figure 7 Shown, the AGC is locked, the reception signal into the modem. At this coarse synchronization will not be detected immediately, but the delay some time to be detected. Delay time (T) is the time to give (701) AGC latest locked by subtracting a time (702) synchronized crude short training sequence is ended.

[0084] In the practice, the AGC lock (703) after a delay time (T) obtained threshold (704), which enables coarse synchronization detector (705) occurs after the threshold is generated. This enables the AGC lock (703), the coarse synchronization detect the coarse synchronization will not be detected before (705) triggers, this will effectively reduce false synchronization occurs.

example 2

[0086] like Figure 8 , The reception signal obtained through the delay output from the correlation processing (801) using the output (801) by the AGC delay trigger lock counted threshold value (802), the calculated threshold value is output from the trigger start extracting results (801) 16 values ​​are then averaged to give, after the threshold value calculation is completed, the threshold come into effect coarse synchronization detection starts, and then outputs the result (801) is compared with a threshold value by a comparator (803) and outputs 1-bit comparison result, the comparison result through a tap coefficient for the full 5 tap filter (804) 1, output data values ​​in the filter register (805) are compared, wherein the value of the register is 5, show that the antenna is equal to the coarse synchronization is detected; the role of the 5-tap filter (804) is characterized by: 5 points in a row to reach the threshold was considered to be a crude synchronous triggering;

[0...

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Abstract

Disclosed are a signal synchronization method and apparatus. The signal synchronization method comprises: when an automatic gain control (AGC) unit locks a received signal, carrying out delay auto-correlation processing on a signal received by each receiving antenna, comparing each processed received signal with a reference threshold corresponding to the received signal after a first time length is delayed, and determining, according to each comparison result, whether coarse synchronization is completed; and after coarse synchronization is completed, carrying out local cross-correlation processing on each received signal, carrying out weighted accumulation and filtering on each local cross-correlation processing result, searching for the maximum value in a filtered signal, and determining that fine synchronization is completed when the maximum value is found.

Description

Technical field [0001] The present invention relates to wireless communication technologies, and in particular relates to a method and apparatus for synchronizing signals. Background technique [0002] Synchronization performance is directly related to the performance of the whole communication system. It can be said there is no accurate synchronization algorithm, it is impossible for reliable data transmission, which is a prerequisite for reliable transmission of information. For orthogonal frequency-division multiplexing (Orthogonal Frequency Division Multiplexing, referred to as OFDM) system, the system for synchronizing demanding. Because synchronization error introduced by various inter-carrier interference (Inter Channel Interference, referred to as ICI), intersymbol interference (inter symbol interference, referred to as ISI) will be such that the receiver can not receive data correctly, and also the destruction of each subcarrier within an OFDM system orthogonality. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B7/0413
CPCH04B7/0413H04L27/2655H04L27/26
Inventor 杨旭磊程晨白栎旸刘览孙远航李彧
Owner SANECHIPS TECH CO LTD