Low complexity OFDM quick synchronising method

A low-complexity, time-synchronization technology, applied in the field of OFDM synchronization, can solve problems such as slow synchronization speed, difficult synchronization, and difficult implementation

Inactive Publication Date: 2007-12-05
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the influence of the channel, it is not a sharp peak as expected, so it is not easy to find synchronization accurately; w

Method used

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  • Low complexity OFDM quick synchronising method
  • Low complexity OFDM quick synchronising method
  • Low complexity OFDM quick synchronising method

Examples

Experimental program
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Embodiment Construction

[0090] The implementation method of this patent under a specific OFDM configuration is given below. It should be noted that the parameters in the following examples do not affect the generality of this patent.

[0091] This implementation method adopts the simulation tool cossap, and sets the OFDM useful symbol length to N=4096.

[0092] 1. Origin:

[0093] The PN sequence selects a Gold sequence with a length of 511, which is recorded as m[n]n∈[0, 51 1], m[n]∈{1+j, -1-j}. The PN sequence m[n] and the modulated data form an OFDM symbol with a length of 4096. After IFFT transformation, a cyclic prefix with a length of 864 is added to each OFDM original symbol and transmitted.

[0094] Second, the receiving end

[0095] Each time the receiving end receives 800 data, it calculates the relevant output value according to formulas (3) and (4). When the relevant output value is greater than the preset threshold of 0.22, the time coarse synchronization point is obtained , then fr...

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Abstract

Characters of the method are that repeating a PN sequence for once at sending end; when receiving each L pieces of data, receiving end carries out autocorrelation once to find out the position of the first value, which exceeds threshold; before the said position, starting carrying out M+1 times of cross correlation, and carrying out conjugated multiplication for two adjacent values of cross correlation; finally, finding out position of first value, which exceeds threshold, form moduli of M pieces of conjugated multiplications in order to accurate position of time synchronization so as to realize fast time synchronism. The invention reduces complexity of implementation, and raises speed of time synchronism for receiver.

Description

technical field [0001] The invention belongs to the field of wireless communication or wired communication, and particularly relates to a method for OFDM synchronization. Background technique [0002] OFDM has attracted more and more attention due to its high data transmission rate, strong anti-multipath interference ability, and high spectrum efficiency. It has been successfully used in wired and wireless communications. Such as: DAB (Digital Audio Broadcasting), DVB, IEEE802.11a and HyperLAN / 2. OFDM, a new modulation technology, can also be used in a new generation of mobile communication systems. The use of OFDM technology will greatly improve the transmission data rate and spectrum efficiency of the new generation mobile communication system, and has a good anti-multipath ability, see the literature: Bingham, J.A.C., "Multicarrier modulation for data transmission: an idea whosetime has come", IEEE Communications Magazine, Volume: 28 Issue: 5, May 1990, Page(s): 5-14 a...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L7/027H04J11/00H04J1/00
Inventor 肖悦易巧雷霞李少谦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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