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High-precision symbol synchronization system

A symbol-synchronous, high-precision technology, which is applied in transmission systems, synchronization devices, and synchronization receivers, can solve problems affecting communication system performance and low estimation accuracy, and achieve the effects of improving estimation accuracy, fast capture, and precise tracking

Active Publication Date: 2021-03-09
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0011] The current time synchronization technology has the problem of low estimation accuracy in the face of high-order modulation signals and low roll-off factor shaping signals, which seriously affects the performance of communication systems

Method used

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Embodiment Construction

[0050]The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] A high-precision symbol synchronization system of the present invention includes: a time error detector, a time error filter, an interpolation controller and an interpolation filter; the time error detector performs N times (( N is an integer multiple of 4) sampled data, make a preliminary estimate of the time error between the receiver and the transmitter in the communication system, obtain a rough estimate of the time error, and send it to the time error filter; the time error filter, according to the time The rough estimation value of the error, determine the fine estimation value of the time error, and send it to the interpolation controller; the interpolation controller receives the externally input data of N times sampling of the single-channel symbol in the communication system, and uses the fine estimation value of the time...

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Abstract

The present invention provides a high-precision symbol synchronization system which comprises a time error detector, a time error filter, an interpolation controller and an interpolation filter, the time error detector is used for preliminarily estimating a time error between a receiver and a transmitter in the communication system according to externally input data for carrying out N times of sampling on a single symbol in the communication system to obtain a time error rough estimation value; the time error filter is used for determining a time error fine estimation value according to the time error rough estimation value; the interpolation controller is used for adjusting the data sampled by N times according to the time error fine estimation value, outputting the adjusted data, and determining a fractional pointer required by the interpolation filter according to the time error fine estimation value; and the interpolation filter is used for carrying out interpolation operation on the adjusted data according to a fractional pointer required by the interpolation filter to obtain data finishing symbol synchronization, so that high-precision symbol synchronization is realized.

Description

technical field [0001] The invention relates to a high-precision symbol synchronization system, which belongs to the technical field of symbol synchronization for burst signals and continuous signals. Background technique [0002] With the improvement of wireless communication capacity, in the case of tight frequency resources, in order to improve the frequency band utilization of the entire system and achieve high-speed transmission, high-order modulation must be used, and low roll-off coefficients must be used to perform pulse shaping on the transmitted signal. However, high-order modulation and low roll-off coefficient shaping inevitably put forward higher requirements on the design of the receiver, especially on the performance of the symbol synchronization algorithm. For symbol synchronization, the use of high-order modulation or low roll-off coefficient shaping will increase the self-noise of common time error estimation algorithms including Gardner algorithm and digit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00
CPCH04L7/002H04L7/0079Y02D30/70
Inventor 张昊亮翟盛华龚险峰张剑黄玥嘉侯瑜
Owner XIAN INSTITUE OF SPACE RADIO TECH
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