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Method of proceeding OFDM rapid synchronization using Barke code and training sequence

A technology of training sequence and Barker code, applied in the field of OFDM synchronization

Inactive Publication Date: 2004-05-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0016] Obviously, we can hardly Figure 4 Find a better peak detection threshold in

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  • Method of proceeding OFDM rapid synchronization using Barke code and training sequence
  • Method of proceeding OFDM rapid synchronization using Barke code and training sequence
  • Method of proceeding OFDM rapid synchronization using Barke code and training sequence

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Embodiment Construction

[0084] 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.

[0085] It is assumed that the useful symbol length of OFDM is N=4096. Taking ρ=1 means that the transmitted data is completely a training sequence.

[0086] 1. Origin:

[0087] The PN sequence selects an m sequence with a period of 31, which is recorded as m[k]k∈[0, 30], m[k]∈{1+j, -1-j}. Then the number of repetitions of the above m sequence in the training sequence L=N / N m =4096 / 127=33; select the Barker code as [+1 +1 +1 -1], and the length is N b =4, inversion is b[k]: [-1 +1 +1 +1], calculates the Barker code b in differential form according to formula 3 1 [k]: [+1 -1 -1 -1 -1]. The m sequence m[k] is repeated 4+1=5 times to obtain m'[k]. According to formula 4 with b 1 [k] controls the symbol of each bit of m′[k] to get t[k], the length is 4096, add a cyc...

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Abstract

At sending end, a PN sequence is repeated for multiple times continuously. The training sequence is constituted after positive and negative polarities of front some segments of PN sequence are determined by barker code. Emission data are constituted by weighted addition in point to point between the said training sequence and OFDM original data. At receiving end, sectional correlation calculation with barker code as weight value is carried out so as to obtain objective function value utilized to evaluate point of time synchronization. The point making the objective function value exceed prearranged threshold is a point of time synchronization. The method possesses advantages of fast synchronization speed and simple implementation, suitable for synchronization of OFDM system under packet transmission.

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, EEE802.11a and HyperLAN / 2, in the IEEE802.16 that is currently being formulated, OFDM technology is also involved in a large number. 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: a...

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Application Information

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IPC IPC(8): H03M7/00H04J11/00H04L7/00H04L27/32
Inventor 严春林房家奕唐友喜李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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