RRU and on-line ACLR self-diagnosis method thereof

A self-diagnosis and frequency point technology, applied in the field of communication, to achieve the effect of low cost and convenient operation

Active Publication Date: 2017-12-15
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention provides an RRU and its online ACLR self-diagnosis method to solve the problem in the prior art that the ACLR test cannot be realized in the RRU online state

Method used

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  • RRU and on-line ACLR self-diagnosis method thereof
  • RRU and on-line ACLR self-diagnosis method thereof
  • RRU and on-line ACLR self-diagnosis method thereof

Examples

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application example 1

[0109] Application example 1, a RRU with a transmission bandwidth of 2530M-2630M is taken as an example to describe in detail.

[0110] The transmission bandwidth of this RRU is 100M continuous bandwidth. In order to achieve DPD (Digital Pre-Distortion, digital pre-distortion) performance, the sampling frequency of the feedback channel must cover at least the fifth-order intermodulation bandwidth. According to the Nyquist sampling law, the sampling rate ( Multi-sampling) should be at least 100*5=500M, considering other factors the sampling rate is finally determined as 491.52M, for the convenience of describing the present invention still assumes that the sampling rate is 500M. Therefore, the actual sampling frequency coverage of the feedback channel is from 2530-2*100=2330M to 2630+2*100=2830M.

[0111] In the production stage, start at 2330M, end at 2830M, and step by 5M. The test generates a feedback calibration data file. The calibration value is in dB. The file format is ...

application example 2

[0124] Application example 2, taking a RRU with transmission bandwidths of 1880M-1915M and 2010M-2025M as an example to describe in detail.

[0125] This type of RRU transmit frequency band is divided into two sections, and no carrier is transmitted within the bandwidth interval of the two sections. Ignoring the intermodulation between the two frequency bands and only considering the 5th-order intermodulation of their respective frequency bands, that is, the feedback sampling needs to cover 1810M to 1985M, 1980M to 2055M, and the 5th-order intermodulation bandwidths of the two frequency bands overlap slightly, so the feedback Sampling collects two-band data at one time, and the sampling frequency (real sampling) needs to be at least greater than (2055-1810)*2=490M. In the production stage, test and save the calibration data files of the two frequency bands separately.

[0126] In the online diagnosis stage, the FFT spectrum of the two frequency bands is generated at one time,...

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Abstract

The invention discloses an RRU and an on-line ACLR self-diagnosis method thereof. The method comprises the steps that a frequency spectrum in the sampling frequency coverage is generated through calculation by means of transmission data, acquired by a feedback channel in the sampling frequency coverage, of an RRU transmission port; a calibration file which is generated in advance and stores power compensation values of the feedback channel at different frequencies is read to conduct calibration compensation on power values of frequencies in the frequency spectrum obtained through calculation; and ACLRs of all carriers are calculated on the basis of the frequency spectrum obtained after calibration compensation. According to the on-line diagnosis scheme, the FFT calculation result is compensated through pre-stored feedback calibration data to obtain a more precise ACLR index, the diagnosis process does not need the help of external equipment, is not limited by time and place and is low in cost and convenient to operate, and therefore the problem that in the prior art, ACLR testing cannot be achieved in the on-line state of the RRU is solved.

Description

technical field [0001] The invention relates to the communication field, in particular to an RRU and an online ACLR self-diagnosis method thereof. Background technique [0002] ACLR (Adjacent Channel Leakage Ratio, Adjacent Channel Leakage Ratio) is one of the most important radio frequency indicators of RRU (Radio Remote Unit, radio remote unit). The ratio of the average power of the adjacent channel (or offset) to the average power of the transmit frequency channel. Adjacent channel leakage is usually produced by the nonlinear effect of devices such as output power amplifiers, which will interfere or even destroy the useful signals of adjacent channels. Therefore, there are clear standards in wireless communication protocols and must be accurately measured. [0003] The most common and direct way to measure ACLR is to use a spectrum analyzer. The advantage is that it is accurate, but there are many disadvantages at the same time: [0004] 1. Spectrum analyzers are expens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/354
CPCH04B17/354
Inventor 马乐
Owner ZTE CORP
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