Carrier frequency deviation estimation method and device

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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Problems solved by technology

[0006] The present invention provides a method and device for estimating carrier frequency offset, which is used to solve the problem of low estimation accuracy of carrier frequency offset in OFDM system in the prior art

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