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Downlink transmission synchronization method based on broadband wireless communication system

A broadband wireless communication and synchronization sequence technology, which is applied in wireless communication, synchronization devices, multi-frequency code systems, etc., can solve the problems of complex operation and low flexibility, and achieve the effect of simple operation, strong flexibility, and accurate estimation

Inactive Publication Date: 2015-05-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0002] The emergence of 3G mobile communication has brought a lot of convenience to people, but with the increasing demand for wireless services, the transmission rate of the current 3G system is far from meeting the growing needs of people, so many new wireless broadband technologies have emerged pregnancy
However, these methods have the problems of complex operation and low flexibility.

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  • Downlink transmission synchronization method based on broadband wireless communication system
  • Downlink transmission synchronization method based on broadband wireless communication system
  • Downlink transmission synchronization method based on broadband wireless communication system

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Embodiment Construction

[0041] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0042] figure 1 It is a data frame structure of broadband wireless communication system.

[0043] In this example, iffigure 1 As shown in , the length of the data frame is T f =614400T s =20ms, including 40 time slots, namely slot#0~#39, each time slot length T slot =15360T s =0.5ms, the length of the OFDM symbol is 512bits, and the synchronization symbol is placed in a fixed position. It should be noted that, according to different broadband wireless communication system requirements, the frame length, symbol length, synchronization symbol position, etc. can be adjust...

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Abstract

The invention discloses a downlink transmission synchronization method based on a broadband wireless communication system and focused on the broadband wireless communication system adopting orthogonal frequency division multiplexing (OFDM). The method comprises the following steps of: firstly generating two synchronization sequences according to a ZC sequence and expanding the two synchronization sequences into two synchronous symbols; then, implementing time synchronization according to high autocorrelation of the ZC sequence; and finally, estimating a frequency deflection by carrying out a maximum likelihood frequency deflection estimation algorithm twice. A test shows that the estimation method can be used for accurately determining a start position of a data frame, realizing time synchronization and accurately estimating the frequency deflection. By the method, time synchronization and frequency deflection estimation of the broadband wireless communication system can be implemented; and the method is easy to operate and low in complexity. Furthermore, according to different system requirements, a synchronous sequence and a synchronous symbol can be flexibly adjusted, so the flexibility is extremely high.

Description

technical field [0001] The invention belongs to the technical field of communication system synchronization, and more specifically relates to a downlink transmission synchronization method based on a broadband wireless communication system. Background technique [0002] The emergence of 3G mobile communication has brought a lot of convenience to people, but with the increasing demand for wireless services, the transmission rate of the current 3G system is far from meeting the growing needs of people, so many new wireless broadband technologies have emerged pregnancy. The new wireless broadband technology is designed to increase data transmission rate, reduce system delay, increase system capacity and coverage, and reduce operating costs at the same time. [0003] These new wireless broadband technologies include 802.11a, LTE (Long Term Evolution), etc. Among them, LTE proposed by 3GPP (3rd Generation Partnership Project) has attracted much attention. In order to meet its p...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04W56/00
Inventor 刘健隆克平周洁
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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