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Frequency synchronization method based on pre-correction of sending terminal

A frequency synchronization and frequency technology, applied in the field of OFDM synchronization, can solve the problem of high hardware complexity of the receiver, and achieve the effect of simplifying the hardware complexity and improving the transmission efficiency.

Inactive Publication Date: 2011-02-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The main disadvantage of the existing method is that the frequency synchronization is performed at the receiving end, so the hardware complexity of the receiver of the existing method is relatively high

Method used

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  • Frequency synchronization method based on pre-correction of sending terminal
  • Frequency synchronization method based on pre-correction of sending terminal
  • Frequency synchronization method based on pre-correction of sending terminal

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Experimental program
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Embodiment Construction

[0066] 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.

[0067] This implementation method adopts the simulation tool cossap, and sets the OFDM useful symbol length to N=1024.

[0068] 1. Origin:

[0069] The frequency offset is estimated by using the guided frequency offset estimation method The modulated data is formed into an OFDM symbol with a length of 1024, and after IFFT transformation, a cyclic prefix with a length of 216 is added to each OFDM original symbol to obtain data without frequency offset Then use the frequency offset The frequency offset compensation method for data without frequency offset Perform compensation and transmit the compensated signal.

[0070] Second, the receiving end

[0071] After receiving the signal, the receiving end performs time synchronization and removes the cyclic prefix a...

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PUM

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Abstract

The invention provides a frequency synchronization method based on frequency pre-correction, which uses the consistent frequency offset of the system uplink and downlink to conduct OFDM frequency synchronization. The characteristic of the invention is that a receiving terminal transmits data for the frequency synchronization; a transmission terminal receives data for the frequency synchronization, the frequency offset is pre-corrected according to the prior frequency synchronization method, then the signals are transmitted so that the frequency synchronization is not conducted at the receiving terminal and only the time synchronization is needed. Because the frequency correction is conducted at the transmission terminal, then the frequency synchronization in not needed again at the receiving terminal, thus the adoption of the invention can reduce the hardware complexity of the receiving terminal.

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, IEEE802.16 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 whose time has come" , IEEE Communications Magazine, Volume: 28 Issue: 5, May1990, Pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04L7/00H04L27/26
Inventor 肖悦易巧李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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