CFO (Carrier Frequency Offset) evaluation method based on multiple noises

A technology of noise and channel noise, which is applied in the field of CFO estimation based on multiple noises, and can solve problems such as OFDM performance degradation

Active Publication Date: 2016-11-09
东开数科(山东)产业园有限公司
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of OFDM performance degradation caused by CFO deviation in the LTE network, so as to avoid better utilization of the spectrum efficiency of the entire communication system in a multipath environment, provide higher cell service throughput, and improve customer perception. A multi-noise based CFO estimation method is proposed

Method used

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  • CFO (Carrier Frequency Offset) evaluation method based on multiple noises
  • CFO (Carrier Frequency Offset) evaluation method based on multiple noises
  • CFO (Carrier Frequency Offset) evaluation method based on multiple noises

Examples

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Embodiment 1

[0025] The multi-noise-based CFO estimation method described in this example includes steps such as multi-noise triggering, capturing synthetic signals, estimating deflection factors, and estimating CFO.

[0026] A preferred scheme includes the following steps:

[0027] Step 1: Multi-noise trigger;

[0028] Step 1-1: Set the constant N g , for length N=N g 2 the transmission signal

[0029] x(n)(n=0..N-1), its received signal y(n)=x(n)*δ(ε)+w(n), where δ is the signal deflection factor due to CFO, it is a function of ε, ε is the CFO to be estimated, and w(n) is the channel noise;

[0030] Step 1-2: Set the number of noise k to generate a unitary matrix training sequence

[0031] u k ={u 1 (n), u 2 (n),... u k (n)}, randomly generate channel noise W k ={w 1 (n),w 2 (n),...w k (n)}, use the channel model established in step 1-1 to generate the corresponding received signal Y k ={y 1 (n),y 2 (n),...y k (n)};

[0032] Step 2: Capture the synthetic signal;

[00...

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Abstract

This invention discloses a CFO evaluation method based on multiple noises. The method comprises the steps of triggering multiple noises, acquiring a composite signal, evaluating a deflection factor and evaluating a CFO. The CFO evaluation method based on multiple noises can generate different received signals by utilizing multiple noises. The received signals can be composited by utilizing the transpose reversible property of a unitary matrix; the frequency deflection of transmission signals and received signals can be acquired based on the correlation of channels; and on the premise of a certain signal-to-noise ratio, the method has smaller minimum mean square error.

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 multiple noises. Background technique [0002] LTE is a communication system currently being developed by 3GPP. It adopts OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) multi-channel mode, and each subcarrier overlaps with each other to greatly improve the spectrum efficiency of the system. It is very suitable for high data This is one of the reasons why LTE can greatly improve cell throughput compared with 2 / 3G technology. The problem is that OFDM needs each subcarrier to maintain its orthogonality to perform, and it is very sensitive to synchronization errors, and the ISI (InternSymbol Interference, intersymbol interference) existing in the multipath fading channel of the actual wireless environment will cause the carrier...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2657H04L27/2695
Inventor 李锋李静
Owner 东开数科(山东)产业园有限公司
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