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CFO (Carrier Frequency Offset) method based on double training sequences

A training sequence and formula calculation technology, applied in digital transmission systems, electrical components, modulated carrier systems, etc., can solve problems such as OFDM performance degradation, and achieve the effect of simplifying the amount of calculation, eliminating the interference of channel noise, and weakening the synchronization error.

Active Publication Date: 2016-09-07
HUAXIN CONSULTATING CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a CFO estimation method based on double training sequences in order to overcome the deficiency of OFDM performance degradation caused by CFO deviation in the LTE network in the prior art

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  • CFO (Carrier Frequency Offset) method based on double training sequences
  • CFO (Carrier Frequency Offset) method based on double training sequences
  • CFO (Carrier Frequency Offset) method based on double training sequences

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] Such as figure 1 The illustrated embodiment is a method for estimating CFO based on dual training sequences, including establishing a transceiver model, adding dual training sequences, synthesizing received signals, capturing deflection factors, and estimating CFO.

[0036] Step 1: Establish a transceiver model;

[0037] Set the transmission signal of the transceiver model as x(n), the received signal as y(n), the length of x(n) is N, N=N g 2 , y(n)=x(n)*δ(ε)+w(n), where δ(ε) is the signal deflection factor, ε is the CFO to be estimated, w(n) is the channel noise, N g Be a constant, n=0,..., N-1;

[0038] Step 2: Add dual training sequences;

[0039] Add two different training sequences u(n) and v(n) to the transceiver model to get z 1 (n)=u(n)*δ(ε)+w(n) and z 2 (n)=v(n)*δ(ε)+w(n);

[0040] Step 3: Receive Signal Synthesis

[00...

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Abstract

The invention discloses a CFO (Carrier Frequency Offset) method based on double training sequences. The method comprises the steps of establishing a transceiving model, adding the double training sequences, synthesizing received signals, capturing an offset factor, estimating a CFO and the like; two different training sequences are added to initial signals, and different received signals are synthesized, so that the influence of noise on frequency offset estimation is completely counteracted. The method has the characteristics of simplifying the calculation quantity, having high capture precision, reducing frequency offset, weakening synchronous errors, reducing the bit error rate of a system and improving customer perception.

Description

technical field [0001] The present invention relates to a method for estimating CFO (Carrier Frequency Offset, carrier frequency offset) of an LTE system, in particular to a method for estimating CFO based on double training sequences. Background technique [0002] LTE is a communication system currently being developed by 3GPP. By adopting OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) multi-channel mode, each subcarrier overlaps with each other, which greatly improves the spectrum efficiency of the system, and is very suitable for high data This is one of the reasons why LTE can greatly improve cell throughput compared with 2 / 3G technology. [0003] The problem is that OFDM needs each sub-carrier to maintain its orthogonality before it can perform well, and it is very sensitive to synchronization errors, and the ISI (Intern Symbol Interference, inter-symbol interference) existing in the multi-path fading channel in the actual ...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2657H04L27/2695
Inventor 肖清华
Owner HUAXIN CONSULTATING CO LTD
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