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Phase compensation method and system in LTE (long term evolution) system

A technology for phase compensation and data compensation, applied in the field of communication, which can solve the problems of reducing the accuracy of linear interpolation and degrading system performance.

Active Publication Date: 2014-09-03
合肥东芯通信股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention provides a phase compensation method and system in an LTE system to overcome the problem in the prior art that the accuracy of linear interpolation is reduced due to the phase rotation after the FFT window position is advanced, thereby causing the performance of the entire system to decline

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  • Phase compensation method and system in LTE (long term evolution) system
  • Phase compensation method and system in LTE (long term evolution) system
  • Phase compensation method and system in LTE (long term evolution) system

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Embodiment 1

[0100] Please refer to the attached Figure 4 , which is a flowchart of a phase compensation method in an LTE system disclosed in an embodiment of the present invention, mainly includes the following steps:

[0101] Step S101, according to the timing point T, obtain the OFDM symbol including the CP after analog-to-digital conversion.

[0102] When step S101 is executed, the received signal is first converted from analog to digital to obtain digital symbols carrying OFDM symbols, and then according to the timing point T, OFDM symbols containing CP in the digital symbols are obtained, so as to perform the following phase compensation.

[0103] Step S102, intercepting sampling points in the CP whose length is the preset advance amount L, and performing phase compensation on the data in the FFT window to obtain compensation data.

[0104] Execute step S102 to perform phase compensation, that is, to perform phase compensation on the OFDM symbols containing CP obtained in step S101...

Embodiment 2

[0109] On the basis of the embodiments disclosed in the present invention above, as Figure 5a and Figure 5b As shown, in the process of performing the phase compensation in step S102, there are specifically the following two embodiments:

[0110] one, such as Figure 5a As shown, the sampling points whose length is the preset advance amount L are intercepted in the CP, and the phase compensation is performed on the data in the FFT window to obtain the compensated data mainly for the data in the FFT window 1.

[0111] First, the data in the FFT window 1 and the first sampling point whose CP tail length is the preset advance amount L are intercepted.

[0112] Secondly, the intercepted first sampling point with a length of L is taken out, and the first sampling point is used to cover the data whose tail length is L in the FFT window 1 .

[0113] Finally, the data in the FFT window 1 whose tail is covered is determined as compensation data, and the compensation data is used. ...

Embodiment 3

[0144]The embodiments disclosed above relate to intercepting sampling points whose length is the preset advance amount L in the CP. Generally speaking, the preset advance amount L is obtained based on engineering experience, and its physical meaning is: the distance from the timing point T for timing estimation to the first path of the fading channel, the distance can be measured by the number of sampling points, and the estimated distance Accuracy also affects overall system performance. In order to ensure the accuracy of the length of the intercepted CP involved in the process of phase compensation in the present invention, that is, the accuracy of the preset advance amount L, it is ensured that the performance of the entire system will not be affected. Therefore, this embodiment discloses a method of estimating the advance L, that is, a method of presetting the advance L, on the basis of the above disclosed embodiments of the present invention. For details, please refer to...

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Abstract

The invention discloses a phase compensation method and a phase compensation system in a LTE (long term evolution) system, wherein the method comprises the following steps: acquiring an OFDM (orthogonal frequency division multiplexing) symbol which comprises a CP (cyclic prefix) and is subjected to analog-to-digital conversion according to a timing point; intercepting a sampling point with a length equal to a preset lead L in the CP, and carrying out phase compensation on data in a FFT (fast fourier transform) window so as to obtain compensation data; carrying out FFT conversion on the compensation data so as to obtain corresponding frequency domain data, and then sending the frequency domain data to a data buffer area; and acquiring reference signals in the frequency domain data stored in the data buffer area, and according to the reference signals, estimating errors of time domain timing, and updating the timing point. According to the method and the system, through intercepting the sampling point with the length equal to the preset lead L in the CP, and acquiring the compensation data subjected to the processing above and carrying out the FFT conversion on the compensation data, the influence of phase rotation on the performance of a subsequent channel-estimated linear interpolation in the prior art is overcome, thereby improving the performance of the whole system.

Description

technical field [0001] The present invention relates to the field of communication technology, and more specifically, relates to a phase compensation method and system in an LTE (Long Term Evolution system, long-term evolution) system. Background technique [0002] For the current development of communication technology, the transition from the 3G era to the 4G era has begun, and the LTE (Long Term Evolution system, long-term evolution) system is widely regarded as a 4G wireless communication system. Wherein, the physical layer of the LTE adopts OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology. Such as figure 1 As shown, there are two consecutive OFDM symbols in time, OFDM symbol n and OFDM symbol n+1. Wherein, the structure of the time-domain OFDM symbol conforming to the LTE definition includes: a CP (cyclic prefix) part and a data (data) part. [0003] Ideally in the prior art, if the timing is accurate, the chann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 张国松莫勇李亚辉胡剑锋任江涛吴齐发唐相国
Owner 合肥东芯通信股份有限公司