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Method of time synchronization detection and time synchronization for orthogonal frequency division multiplexing communication system

A communication system and time synchronization technology, applied in the directions of orthogonal multiplexing system, multiplexing communication, frequency modulation carrier system, etc., can solve the problems of reducing system performance, reducing data transmission capacity, increasing data BER, etc. , to reduce interference, improve BER performance, and improve accuracy

Inactive Publication Date: 2004-06-16
BEIJING SAMSUNG TELECOM R&D CENT +1
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Problems solved by technology

Such a conservative time resource allocation method makes most of the synchronization time unused, reducing the data transmission capacity of the entire system
Moreover, the user cannot initiate the synchronization request of the base station at any time, it must wait until the time period specially allocated for synchronization before it can synchronize with the base station
[0015] If some subcarriers are allocated for time synchronization, since the subcarriers used to transmit synchronization signals and the subcarriers used to transmit data are not fully symbol-synchronized, there will be inter-carrier interference between them, which will increase the BER of data. Large, reducing the performance of the entire system
Moreover, the part of the subcarriers used to transmit the synchronization signal has been unable to transmit data, which also reduces the data transmission capability of the entire system

Method used

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  • Method of time synchronization detection and time synchronization for orthogonal frequency division multiplexing communication system
  • Method of time synchronization detection and time synchronization for orthogonal frequency division multiplexing communication system
  • Method of time synchronization detection and time synchronization for orthogonal frequency division multiplexing communication system

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Embodiment Construction

[0060] The present invention utilizes the correlation characteristics of PN sequences to perform OFDM symbol time synchronization, directly superimposes PN sequences on the original OFDM symbols, and performs correlation detection on the received signal sequences at the receiving end. If there is a PN sequence included in it, then Correlation peaks are obtained and their peak positions indicate time offsets.

[0061] Due to the correlation characteristics of the PN sequence, the position of its correlation peak can be accurately positioned within the duration of one PN chip, which greatly improves the accuracy of downlink time synchronization.

[0062] The system block diagram of the transmitting end of the present invention is as figure 1 , at the transmitting end, it is mainly composed of two parts, one part is to form OFDM symbols, and the other part is to form PN sequences. These two parts are superimposed before analog-to-digital signal conversion, and finally transmitte...

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Abstract

The invention proposes a detecting method of synchronization between base station and user time in OFDM communication system and the realizing method of time synchronization. The transmitting end superimposes reset PN series to OFDM symbol before the analog-to-digital conversion in OFDM symbol generating process; at the reception end, the base station or user receives OFDM, detects the correlation of part of the OFDM signal sampled value and a preset PN series, it can confirm the starting time of received symbol and the time deviation of OFDM symbol starting time of base station or user. The user adjusts the starting time of him symbol and the time of signal transmitting, makes user synchronous to base station in time.

Description

technical field [0001] The present invention relates to a time synchronization detection method and a time synchronization method of an Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) communication system, in particular to the time synchronization detection of a base station and a user uplink and downlink using a pseudo-random sequence (hereinafter referred to as a PN sequence) method and time synchronization method. Background technique [0002] OFDM technology is a communication technology that has been widely used recently. Its technical point is to divide the entire transmission frequency band into several sub-bands, and use mutually orthogonal sub-carriers to transmit data information in parallel on each sub-band. The orthogonality between them, the data transmitted in parallel can be separated at the receiving end. [0003] OFDM technology has been successfully applied in many communication systems, for example, digital broadcasting (DAB) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04L7/00H04L27/10H04L27/32
Inventor 王家城王海曹锋铭许昌龙陈永春仲川周判渝朴东植李玄又
Owner BEIJING SAMSUNG TELECOM R&D CENT
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