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Timing synchronization method based on CAZAC sequence under distributed MIMO-OFDM system

A MIMO-OFDM and timing synchronization technology, applied in diversity/multi-antenna systems, transmission systems, multi-frequency code systems, etc., can solve the problems of inability to distinguish transmitting antennas and reduce computational complexity, achieving less time-consuming and more complex Reduced effect

Inactive Publication Date: 2017-01-25
CHONGQING UNIV OF POSTS & TELECOMM
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  • Abstract
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Problems solved by technology

A timing synchronization method based on CAZAC sequences is proposed to overcome the problem that the WPS algorithm cannot distinguish the transmitting antenna corresponding to each correlation peak, and the computational complexity is greatly reduced.

Method used

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  • Timing synchronization method based on CAZAC sequence under distributed MIMO-OFDM system
  • Timing synchronization method based on CAZAC sequence under distributed MIMO-OFDM system
  • Timing synchronization method based on CAZAC sequence under distributed MIMO-OFDM system

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Embodiment Construction

[0025] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0026] Technical scheme of the present invention is as follows:

[0027] like figure 1 As shown, the steps of the preferred embodiment of the present invention are as follows:

[0028] Step 1: If image 3 As shown in , the CAZAC sequence is inserted into each transmitting antenna port at the transmitting end, and the generation formula is as follows. Each set of CAZAC sequences is distinguished by the root indicator sequence u.

[0029] d u ( n ) = e - j π u...

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Abstract

The invention discloses a timing synchronization method based on a CAZAC sequence under a distributed MIMO-OFDM system, relates to a timing synchronization algorithm based on the CAZAC sequence under the distributed MIMO-OFDM system in the field of radio communication, and aims at solving the problems that local synchronization sequences of a WPS algorithm are excessive under the distributed MIMO-OFDM system and computation complexity is high. In a distributed cellular system, ID information in a cell physical group is born on one transmitting main antenna by virtue of three groups of CAZAC sequences of different root values, and fixed CAZAC sequences of other root values are transmitted on other antennae to distinguish time delays among different transmitting antennae, so that timing synchronization of the distributed antenna cellular system is realized. The method disclosed by the invention can be applied to the distributed MIMO-OFDM system in a cellular network environment.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to research on a timing synchronization method for a distributed MIMO-OFDM system. Background technique [0002] Due to the increasing demand for signal transmission rate and transmission quality in modern wireless communication systems. The combination of MIMO technology and OFDM technology has become an ideal solution for future wireless systems. MIMO technology can improve system capacity and signal transmission performance without increasing bandwidth through transmission diversity, beamforming and spatial multiplexing. OFDM adopts different modulation methods to adapt to the wireless channel environment through parallel modulation of multiple subcarriers. In addition, OFDM symbols have good anti-multipath interference performance due to their own structure characteristics. [0003] In the distributed antenna system, base station antennas are placed throughout the cell,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/04
CPCH04L27/2665H04B7/0413
Inventor 王华华周远文李小文陈发堂王丹刘宇
Owner CHONGQING UNIV OF POSTS & TELECOMM
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