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Method for conducting LOFDM system timing and carrier synchronization utilizing training sequence

A training sequence and carrier synchronization technology, which is applied in the direction of orthogonal multiplexing system, multi-frequency code system, multiplexing communication, etc.

Inactive Publication Date: 2009-06-03
PLA UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0007] How to deal with the timing deviation and frequency deviation in the LOFDM system, that is, the synchronous acquisition of the signal, has a very important impact on the performance of the LOFDM system, but there is no synchronous acquisition method with good effect for the LOFDM system.

Method used

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  • Method for conducting LOFDM system timing and carrier synchronization utilizing training sequence
  • Method for conducting LOFDM system timing and carrier synchronization utilizing training sequence
  • Method for conducting LOFDM system timing and carrier synchronization utilizing training sequence

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Embodiment Construction

[0054] 1. Continuous time LOFDM system

[0055] The maximum delay spread of the generalized stationary incoherent scatter channel (WSSUS) is τ max , the maximum Doppler spread is f d , according to the method proposed in the existing literature (Jian Wei, Shen Yuehong, Li Yi. Pulse shaping of optimal LOFDM system based on generalized Gabor transform [J]. Journal of Electronics and Information Technology, 2006, 28(7): 1274-1278.) , the pulse shaping function suitable for LOFDM system can be designed The effective bandwidth σ ω and effective duration σ t The maximum Doppler spread and the maximum delay spread of the channel satisfy σ ω / σ t = f d / τ max , that is, the pulse shaping function matches the scattering function of the channel. Let T represent the symbol period of the OFDM system with the spectrum utilization rate ρ=1 / TF, and F represent the subcarrier spacing of the OFDM system, then the hexagonal grid LOFDM system with the spectrum utilization rate ρ and mat...

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Abstract

The invention relates to a method for conducting LOFDM system timing and carrier synchronization by utilizing training sequence. The method comprises the following steps: adding training symbols before data symbols for the detection and the synchronization of initial signals; and completing synchronous signal capture through assessing and compensating carrier deviation and timing deviation of signals in system transmission course, and achieving ideal synchronous capture effect. The invention designs the frame format and the training sequence of the LOFDM system and proposes the time and the frequency synchronous method synchronous capture method of the LOFDM system: initial signal detection, rough timing and synchronization and rough decimal multiple frequency offset estimation, accurate timing and synchronization and integral multiple frequency offset estimation, and accurate decimal multiple frequency offset estimation; and accurate time and frequency offset estimation can be obtained under the conditions of low noise-signal ratio and big frequency offset, and when the noise-signal ratio is higher than 2 dB, 100% signal detection can be realized, so as to realize the ideal effect of synchronous capture.

Description

technical field [0001] The invention relates to the technical field of Lattice orthogonal frequency division multiplexing (LOFDM) LOFDM (Lattice orthogonal frequency division multiplexing, LOFDM), belongs to the synchronization method of the LOFDM system, and specifically relates to a method for synchronizing the timing and carrier of the LOFDM system by using a training sequence. Background technique [0002] Orthogonal frequency division multiplexing (OFDM) is a data transmission technology with strong anti-multipath fading capability and high spectrum utilization. Traditional OFDM is only to solve the influence of ISI (Inter symbol interference) introduced by time dispersion (ie, multipath), so when it is used in high-speed mobile wireless communication systems with time and frequency dispersion, that is, double dispersion, Severe sub-channel interference ICI (Inter channel interference) will inevitably occur. Pulse shaping OFDM system [Kozek W., Molisch A.F.Nonorthogona...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04J11/00
Inventor 沈越泓许魁袁志钢
Owner PLA UNIV OF SCI & TECH
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