Carrier frequency deviation estimation method and device

A carrier frequency offset and frequency offset estimation technology, which is applied in the direction of synchronization devices, multi-frequency code systems, frequency division multiplexing system components, etc., can solve the problem of low estimation accuracy and achieve the effect of improving estimation accuracy

Active Publication Date: 2008-07-02
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0006] The present invention provides a method and device for estimating carrier frequency offset, which is us

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  • Carrier frequency deviation estimation method and device
  • Carrier frequency deviation estimation method and device
  • Carrier frequency deviation estimation method and device

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[0056] The core idea of ​​the present invention is to set the first threshold value of the frequency offset estimation range in advance, and use the first type pilot symbols of the orthogonal frequency division multiplexing system to obtain the first relative frequency offset estimation value. When the absolute value of the first relative frequency offset estimation value is less than the first threshold value, the cyclic prefix of each orthogonal frequency division multiplexing system symbol is correlated with the corresponding part of the symbol data part of the orthogonal frequency division multiplexing system Calculation to obtain a second relative frequency offset estimation value, weighted average of the first relative frequency offset estimation value and the second relative frequency offset estimation value, to obtain the carrier of the orthogonal frequency division multiplexing system The frequency offset estimation value enables the orthogonal frequency division multiple...

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Abstract

The invention discloses a method for estimating a carrier frequency offset and a device thereof. The invention is used for solving the problem of low estimation precision of the carrier frequency offset in an orthogonal frequency division multiplexing system existing in the prior art. The method in the invention sets a first threshold of the frequency offset estimation range in advance. The method comprises the following steps: A. a pilot symbol of the orthogonal frequency division multiplexing system is used for obtaining an estimation value of a first relative frequency offset; B. an absolute value of the first relative frequency offset estimation value is less than the first threshold value, a second relative frequency offset estimation value is obtained through cyclic prefixes of the orthogonal frequency division multiplexing system symbol and the orthogonal frequency division multiplexing system symbol; C. the carrier frequency offset estimation value of the orthogonal frequency division multiplexing system is obtained through carrying out a weighted average to the first relative frequency offset estimation value and the second relative frequency offset estimation value. The invention is used for estimating the carrier frequency offset of the orthogonal frequency division multiplexing system and increases the estimation precision.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for estimating carrier frequency offset. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) can effectively eliminate inter-symbol interference. OFDM technology modulates high-speed data streams into multiple parallel low-speed data streams with overlapping spectrums. Due to the significant increase in the OFDM symbol period, Therefore, the ability of OFDM symbols to resist multipath delay is improved. By adding a guard interval (GI, Guard Interval) greater than the maximum multipath delay at the front end of the OFDM symbol, the inter-symbol interference (ISI, Inter-Symbol Interference) caused by the multipath delay can be completely eliminated, thus greatly simplifying the Equalization at the receiver. In addition, due to the use of orthogonally overlapping spectrums, O...

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Application Information

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IPC IPC(8): H04L27/26H04L7/00H04J1/16
Inventor 李立华张平孙昊杨晓辉
Owner DATANG MOBILE COMM EQUIP CO LTD
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