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Training sequence frame timing synchronized method based on pseudo-random sequence modulation

A technique of pseudo-random sequence and training sequence, applied in the direction of multi-frequency code system, etc., which can solve the problems of frequency offset or multipath influence, timing estimation offset, multi-correlation peak or peak not sharp, etc.

Inactive Publication Date: 2012-05-30
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems that current training sequence frame timing synchronization is easily affected by frequency offset or multipath, and multi-correlation peaks or peaks are not sharp, causing timing estimation offset and affecting system transmission performance, etc., thereby proposing a Training Sequence Frame Timing Synchronization Method Based on Pseudo-random Sequence Modulation

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  • Training sequence frame timing synchronized method based on pseudo-random sequence modulation
  • Training sequence frame timing synchronized method based on pseudo-random sequence modulation
  • Training sequence frame timing synchronized method based on pseudo-random sequence modulation

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Embodiment Construction

[0048] The method for constructing the frame preamble training sequence structure modulated by the pseudo-random sequence at the transmitting end and the three-stage timing synchronization process at the receiving end of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0049] The sending end needs to select a certain preamble training sequence structure so that the receiving end can synchronize. A frame preamble training sequence construction method using pseudo-random sequence modulation, such as figure 1 shown, including the following steps:

[0050] 1-1. Use the concatenation of multiple Frank-zadoff sequences of appropriate length to form the original sequence Um. The purpose of selecting multiple Frank-zadoff sequences for cascading is to obtain the parameters of the receiver equalizer through training. A Frank-zadoff sequence of length U is a complex sequence S fz , the data of its I and Q ...

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Abstract

The invention discloses a training sequence frame timing synchronized method based on pseudo-random sequence modulation, which can be applied in an orthogonal frequency division multiplexing system or a single carrier frequency domain equalization system, and comprises the following steps: (1) carrying out an energy detection by using the relevance of the front part and the back part of a training sequence at a receiving terminal; (2) taking the certain range around the peak position of the energy detection as a rough synchronization timing range; (3) in the rough synchronization timing range, using a local frame leading sequence generated by the receiving terminal to carry out the cross-correlation with a receiving sequence, according to the peak position of the cross-correlation, determining the position of the local frame accurate synchronization timing, wherein the first half part of the leading training sequence is gained by modulation of cascade sequence of self-correlation of aplurality of constant amplitude zero values by adopting the pseudo-random modulation sequence, and the second half part thereof is inverse operation of the first half part. The method can gain highertiming accuracy by using the pseudo-random modulation sequence to carry out the complex fine synchronization.

Description

technical field [0001] The invention belongs to the technical field of wireless communication system design, in particular to a training sequence frame timing synchronization method based on pseudo-random sequence modulation. Background technique [0002] In broadband wireless communication systems, the frequency selective fading caused by multipath transmission will seriously affect the reliability of communication. Orthogonal frequency division multiplexing (OFDM) technology and single carrier frequency domain equalization technology based on FFT / IFFT can effectively overcome the carrier interference and intersymbol interference caused by frequency selective fading, so it has become the core of the fourth-generation wireless communication system technology. [0003] Due to the use of the cyclic prefix in the OFDM system, when the timing deviation is less than the cyclic prefix minus the maximum channel delay extension, only a linear phase shift will be brought, and the ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 曾学文刘马飞孔群娥
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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