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A method and device for frequency offset estimation of cp-ofdm system

A technology of CP-OFDM and frequency offset estimation, applied in multi-frequency code systems and other directions, can solve the problem of increased hardware cost and achieve the effect of good estimation effect

Active Publication Date: 2020-02-07
ASR MICROELECTRONICS CO LTD
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Problems solved by technology

This estimation method requires a high-precision crystal oscillator, resulting in increased hardware cost

Method used

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  • A method and device for frequency offset estimation of cp-ofdm system
  • A method and device for frequency offset estimation of cp-ofdm system
  • A method and device for frequency offset estimation of cp-ofdm system

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Embodiment Construction

[0024] see figure 2 , the frequency offset estimation method of the CP-OFDM system provided by this application includes the following steps.

[0025]Step 202: Use the cyclic prefix (CP, CyclicPrefix) part and the data part of the time domain sample point on the current CP-OFDM symbol of the received signal to perform sliding correlation (sliding correlating), and calculate the first estimated value of the carrier frequency offset according to the maximum correlation value , calculating the first estimated value of the frequency offset of the sampling clock according to the position of the sliding window (sliding window) where the maximum correlation value is located.

[0026] In this step, the time-domain samples of the received signal are denoted as r -GI , r -GI+1 ,...,r -1 , r 0 , r 1 ,...,r N-1 , where GI represents the correlation length, N represents the length of the OFDM symbol, and the correlation result R(d) is obtained by performing sliding correlation using...

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Abstract

The invention discloses a frequency offset estimation method of a CP-OFDM system includes: Sliding correlation is carried out on the cyclic prefix part and the data part of the time domain sample point on the CP-OFDM symbol by using the received signal, a first estimation value of carrier frequency offset is calculated according to the maximum correlation value, and a first estimation value of sampling clock frequency offset is calculated according to the position of a sliding window where the maximum correlation value is located; And initial compensation is carried out on the carrier frequency offset and the sampling clock frequency offset. complex multiplication is performed on the signal values of the same subcarriers on the CP-OFDM time domain symbols to obtain phase values; a second carrier frequency offset estimation value and a second sampling clock frequency offset estimation value are calculated by using the obtained phase value; And closed-loop compensation is carried out onthe carrier frequency offset and the sampling clock frequency offset. The method can be applied to a large-range frequency offset scene in a low signal-to-noise ratio environment, and synchronizationrequirements of a receiver are met.

Description

technical field [0001] The present application relates to a mobile communication technology, in particular to a frequency offset estimation method. Background technique [0002] CP-OFDM (Cyclic Prefix Orthogonal Frequency-Division Multiplexing, Cyclic Prefix Orthogonal Frequency-Division Multiplexing) communication system uses multiple orthogonal sub-carriers (Orthogonal sub-carriers) to transmit data in parallel, which can efficiently transmit data and effectively combat frequency selectivity Effects of fading channels. However, in the process of data transmission, there are strict requirements on the orthogonality of the subcarriers, so the CP-OFDM system is very sensitive to the frequency deviation (ie, frequency deviation) of the carrier and sampling clock, and must use frequency deviation estimation and correction technology. Make the frequency deviation within the tolerable range of the receiver, so as to ensure the correct transmission of data. [0003] In the CP-OF...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 胡天琨朱仕轶唐群元
Owner ASR MICROELECTRONICS CO LTD
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