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A timing recovery method for band-limited systems based on p-order moments

A system timing and recovery method technology, applied in baseband system components, transmission systems, digital transmission systems, etc., can solve problems such as poor performance of timing recovery methods

Active Publication Date: 2018-04-27
BEIJING RES INST OF TELEMETRY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the performance of the traditional timing recovery method based on GA algorithm is poor,

Method used

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  • A timing recovery method for band-limited systems based on p-order moments
  • A timing recovery method for band-limited systems based on p-order moments
  • A timing recovery method for band-limited systems based on p-order moments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The processing results of the timing recovery method of the prior art and the timing recovery method of the present invention are compared.

[0057] (1) Comparison of open-loop S-curve and slope

[0058] The data adopts the QPSK modulation mode, and under the AWGN channel environment, under the condition of SNR=10dB, the existing GA algorithm and the detection characteristics of the band-limited system timing recovery method based on the p-order moment of the present invention are simulated and compared, and the simulation results are as follows figure 2 , image 3 , Figure 4 shown by figure 2 It can be seen that the GA algorithm decreases with the roll-off factor α, the S curve tends to be gentle, and the peak value becomes smaller. When the timing recovery method of the present invention is p=1,2, as the roll-off factor α decreases, the S curve tends to be sharper and the peak becomes larger. Depend on image 3 It can be seen that: keep α=0.05 unchanged, the t...

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Abstract

The invention relates to a timing recovery method for a band-limited system based on p-order moments. In the method, in a feedback phase-locked loop, the p-th power of the signal modulus is used to calculate the timing error detection output value, wherein p>0 is a variable parameter , the method of the present invention can be applied in a timing recovery loop to obtain better residual timing error jitter performance, and the normalized mean square error performance of the timing recovery of the method of the present invention is close to the theoretical Cramereau limit under the AWGN channel. The method of the invention is suitable for a bandwidth-limited communication system with a small roll-off factor, and is suitable for a satellite communication system that needs to increase spectrum utilization.

Description

technical field [0001] The invention relates to the technical field of digital wireless communication transmission, in particular to a timing recovery method for a band-limited system based on p-order moments. Background technique [0002] In a satellite communication system, it is often necessary to perform root-raised cosine shaping on the transmitted signal to improve the spectrum of the signal and reduce interference to adjacent frequency bands. In a digital receiver, it is necessary to recover the timing of the sampled signal to obtain accurate modulation symbols. Timing recovery algorithms are mainly divided into two categories: data-assisted methods and non-data-assisted methods. It is difficult to obtain pilot data before timing synchronization, so non-data-assisted timing methods are more commonly used. Non-data-assisted methods can be divided into two types: forward timing and feedback timing. The forward timing method is suitable for communication systems with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04L25/02H04B7/185
Inventor 闫朝星周三文付林罡马荣孙婉莹史秀秀刘同领张永晓
Owner BEIJING RES INST OF TELEMETRY
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