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A frame synchronization method

A technology of frame synchronization and synchronization sequence, which is applied in the communication, electrical components, transmission system and other directions between multiple stations, and can solve problems such as performance degradation

Inactive Publication Date: 2008-08-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The above-mentioned frame synchronization methods are all completed in the time domain. When there is interference in the channel, especially in-band interference such as single-tone interference, multi-tone interference or narrow-band interference, the performance of these methods will decline rapidly

Method used

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Examples

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Embodiment

[0048] Suppose the channel is an AWGN channel, SNR=0dB; there is narrowband interference in the channel, the ratio of the bandwidth of this interference to the bandwidth of the transmission system is 0.1, and the signal-to-interference ratio is SIR=-5dB.

[0049] 1. Origin

[0050] According to step 1 in the summary of the invention, a CAZAC sequence with a length of 512 is generated according to formula (5)

[0051] According to step 2 in the summary of the invention, the sequence Perform 512-order IFFT transformation. The converted sequence is repeated once to obtain a synchronous training sequence with a length of 1024, and the synchronous sequence is sent to the AWGN channel with interference before the data frame.

[0052] Second, the receiving end

[0053] According to step 5 in the summary of the invention, according to formula (5), produce a length and be 512 the same sequence

[0054] Then 512 pieces of data (r[m]~r[m+511]) are sequentially taken out in the...

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Abstract

The invention provides a frame alignment method which uses constant amplitude zero auto-correlation (CAZAC) sequence as training sequence and frame synchronization tests in frequency domain, by use of CAZAC sequence characteristic and frequent denise property. The method comprises: generating same CAZAC sequence as training sequence at the receiving and emitting ends of a communication system, carrying out interface processing the received signal in frequency domain at the receiving end firstly, then carrying out correlation processing of the CAZAC sequence produced at the receiving end, and acquiring synchronous information by judging correlation peak. Since single-tone interference, multi-tone interference or narrow-band interference can be filtered conveniently in frequency domain, the invention can also get good performance when in-band interface exists in channel.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a frame synchronization technology. Background technique [0002] In wireless communication systems, frame synchronization is a key technology, and the purpose of frame synchronization is to find out the boundaries of data frames in the received serial data stream. Accurate synchronization can minimize the impact of inter-carrier interference (ICI) and inter-symbol interference (ISI). Various subsequent demodulation and decoding processes depend on the quality of the frame synchronization algorithm. See literature: A.R.S.Bahai, B.R.Saltzberg, M . Ergen, Multi-Carrier Digital Communications: Theory and Applications of OFDM 2nd edition, Springer Inc. New York, 2004, ISBN: 387225757. [0003] Existing frame synchronization methods are performed in the time domain, and they all utilize the correlation between the same data, and determine the frame synchronization po...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B1/707H04B7/26H04B1/71
Inventor 田园雷霞李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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