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Timing tracking method and apparatus used in DMR system

A technology of timing tracking and timing deviation, which is used in synchronization devices, baseband system components, electrical components, etc.

Active Publication Date: 2011-10-05
ZHEJIANG UNIV +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in today's DMR physical layer baseband signal demodulation system, there is no timing tracking method or device for tracking sampling drift deviation. Therefore, this patent proposes a new timing tracking method for DMR systems based on the characteristics of 4CPFSK signals in DMR systems. Method and device

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  • Timing tracking method and apparatus used in DMR system
  • Timing tracking method and apparatus used in DMR system
  • Timing tracking method and apparatus used in DMR system

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Embodiment Construction

[0047] The implementation of the technical solution of the present invention will be further described in detail below by taking the timing tracking method and device applied to the DMR system as an example in conjunction with the accompanying drawings.

[0048] refer to figure 1 , the timing tracking method of the present invention comprises the following steps: Step 101, digitally down-converting the DMR physical layer modulation signal to obtain the baseband quadrature signal , , and perform differential and arctangent operations on it to obtain the phase difference ; Step 102, according to Extract the timing deviation from the signal characteristics to get the timing deviation value of the current signal ; Step 103, setting an appropriate weighted value , for the extracted timing offset value Perform a weighted average operation and output the mean ; Step 104, using the length of 10 of Kaiser window and mean Pair difference Perform interpolation corre...

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Abstract

The invention discloses a timing tracking method and apparatus used in a DMR (Digital Mobile Radio) system and is directed to the field of wireless communication technology. The timing tracking apparatus comprises a base-band orthogonal signal difference extractor, a timing deviation extractor, a weight average arithmetic unit and an interpolation corrector. The base-band orthogonal signal difference extractor carries out a digit down conversion processing towards DMR physical layer modulation signals to obtain base-band orthogonal signals I (k) and Q (k). A difference operation and an arc tangent operation are carried out towards the base-band orthogonal signals I (k) and Q (k) to obtain a difference [fai] (k). The timing deviation extractor extracts a timing discrepancy based on [fai] (k) signal characteristics to obtain the timing discrepancy value e (k) of the present signal. The weight average arithmetic unit utilizes a weight value [omega] to carry out a weight average operation towards the extracted timing discrepancy value e (k) and outputs an average value f (k). The interpolation corrector utilizes Kaiser Window and the average value f (k) to carry out an interpolation correction towards the different [fai] (k) to obtain a correction value y (k). According to the timing tracking method and apparatus in the invention, the timing deviation can be accurately estimated and compensated. The invention is suited for the 4CPFSK signal demodulation in the DMR system.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a timing tracking method and device applied to a DMR system or a multi-ary continuous phase modem. Background technique [0002] The DMR (Digital Mobile Radio) protocol is a new digital trunking communication system protocol proposed by the European Telecommunications Standards Institute (ETSI) in 2004. The DMR protocol uses a double-slot TDMA access method. Each burst packet has 2 time slots, and each time slot is 30ms. In order to obtain higher power utilization and frequency band utilization, multi-ary continuous Phase modulation (4CPFSK) mode. [0003] In a DMR system, the start and end position of signal sampling at the receiving end may not be synchronized with the sending end, so the sampling point obtained by the receiving end is often not the current best sampling point, which will seriously affect the bit error performance of the receiver. In addition...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04L25/02
Inventor 钟烈钟杰赵民建王志雄
Owner ZHEJIANG UNIV
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