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Frequency offset estimation method and device for orthogonal frequency division multiplexing (OFDM) communication system

A frequency offset estimation and communication system technology, applied in the field of OFDM communication systems, can solve the problems of complex calculation, long accumulation time, short CP length, etc., and achieve the effects of expanding the frequency offset estimation range, simple calculation, and improving the accuracy of frequency offset estimation

Active Publication Date: 2011-07-06
COMBA TELECOM SYST CHINA LTD
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Problems solved by technology

This method is computationally complex, and due to the short CP length, the estimation accuracy is low; and due to the long accumulation time, the range of normalized frequency offset that can be estimated is small

Method used

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  • Frequency offset estimation method and device for orthogonal frequency division multiplexing (OFDM) communication system
  • Frequency offset estimation method and device for orthogonal frequency division multiplexing (OFDM) communication system
  • Frequency offset estimation method and device for orthogonal frequency division multiplexing (OFDM) communication system

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Embodiment Construction

[0037] The present invention will be set forth below in conjunction with accompanying drawing, at first introduce the method of the present invention, refer to figure 1 , including the steps:

[0038] 101. Extracting the frequency domain original reference signal and time shift parameters;

[0039] 102. According to the extracted data, a time-domain reference signal having a cyclic time-shift characteristic is obtained;

[0040] A time-domain reference signal with cyclic time-shift characteristics is obtained according to the frequency-domain original reference signal and time-shift parameters.

[0041] 103. Send data;

[0042] The sending end of the OFDM communication system sends the time domain reference signal to the receiving end of the OFDM communication system.

[0043] 104. Receive data;

[0044] The receiving end of the OFDM communication system receives the time domain reference signal.

[0045] 105. Extracting a time-shifted reference signal;

[0046] 106. Cal...

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Abstract

The invention discloses a frequency offset estimation method for an orthogonal frequency division multiplexing (OFDM) communication system, which comprises the following steps of: extracting a frequency-domain original reference signal and a time shift parameter; obtaining a time-domain reference signal with cyclic time shift characteristics according to the frequency-domain original reference signal and the time shift parameter; transmitting the time-domain reference signal; receiving the time-domain reference signal; and extracting a time shift reference signal, and calculating an estimatedfrequency offset value according to the time-domain reference signal and the time shift reference signal. The invention also discloses a frequency offset estimation device for the OFDM communication system. By the method and the device, the frequency offset estimation accuracy in the OFDM communication system is improved, and a frequency offset estimation range in the OFDM system is widened.

Description

technical field [0001] The invention relates to an OFDM communication system in mobile communication, in particular to a frequency offset estimation method and device for an OFDM communication system. Background technique [0002] In the field of mobile communication technology, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system is gradually popularized and applied due to its simple structure and good transmission effect. The OFDM system has high spectrum utilization efficiency and strong anti-multipath fading ability, which is beneficial to the realization of wireless multimedia transmission, and can concentrate the transmission power, expand the coverage area, and make the power amplifier simple and cheap, so it has great advantages in the fourth generation mobile communication. Good development prospects. However, in the OFDM system, due to the mismatch between the oscillators at the transmitting end and the receiving end...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 邓单陈立俊
Owner COMBA TELECOM SYST CHINA LTD
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