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A carrier frequency deviation rough synchronization method based on D varying technology

A carrier frequency offset and coarse synchronization technology, applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as sub-channel interference and serious imaging system performance

Inactive Publication Date: 2008-01-09
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carrier frequency deviation will cause interference between sub-channels, if no measures are taken to overcome this channel interference, it will seriously affect the performance of the system

Method used

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  • A carrier frequency deviation rough synchronization method based on D varying technology
  • A carrier frequency deviation rough synchronization method based on D varying technology
  • A carrier frequency deviation rough synchronization method based on D varying technology

Examples

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Embodiment Construction

[0032] The method of the invention is used in the realization of the carrier synchronization part of the receiver system based on the DTMB digital television transmission standard, and good effects are obtained.

[0033] Firstly, the D-spaced algorithm is used for estimation, and the starting position of the received signal frame must be determined before the frame header is used for frequency offset estimation. However, the method of finding the starting position of the frame header through the correlation of the PN sequence will fail when the carrier frequency offset is large. As shown in Figure 2, under different carrier frequency offset conditions, the correlation peaks obtained through PN sequence correlation. It can be concluded from the figure that when the carrier frequency offset (CFO) value is 1KHz, the correlation value of the PN sequence has an obvious correlation peak, and the starting position of the frame header can be determined through the correlation peak. W...

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Abstract

The method comprises; using a peak value detector to find the initial location of signal frame; using the d-variation based carrier frequency offset estimation algorithm to estimate the carrier frequency offset; using maximum likelihood to get more accurate estimation result.

Description

technical field [0001] The invention belongs to the technical field of wireless digital communication, and in particular relates to a carrier frequency offset rough synchronization method, which can be directly applied to a synchronization module in a digital television or digital broadcast receiving system. Background technique [0002] In recent years, wireless communication has received extensive attention. Because the wireless communication transmission environment is relatively harsh, the requirements for digital receivers are relatively high. Due to the instability of the local oscillators in the transmitter and receiver and the Doppler effect in the mobile channel, the locally generated carrier signal is inconsistent with the received carrier signal, so there is a carrier frequency deviation between the transmitter and receiver. Carrier frequency deviation will cause interference between sub-channels. If no measures are taken to overcome this channel interference, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03H04H1/00
Inventor 曾晓洋陈赟武建强巫建明周电
Owner FUDAN UNIV
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