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Antenna calibration method and baseband device

A technology for antenna calibration and channel calibration, applied in baseband system components, diversity/multi-antenna systems, space transmit diversity, etc., can solve peak-average height, signal no longer has low peak-average ratio characteristics of ZC sequence, unpredictable, etc. question

Active Publication Date: 2015-08-26
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

However, due to the difference in the amplitude and phase of each sending channel, the coupled signal no longer has the low peak-to-average ratio characteristic of the ZC sequence, and the randomness of the phase difference will also make the peak-to-average ratio random, and the maximum peak-to-average ratio time Can reach more than 11dB
[0009] Second, the antenna calibration in the TD-LTE system is in the time domain, and the calibration signals of each transmission channel are superimposed in random phases on the calibration channel, and the peak-to-average ratio is high and unpredictable

Method used

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  • Antenna calibration method and baseband device
  • Antenna calibration method and baseband device

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Embodiment 1

[0048] The specific process is as Figure 5A Shown:

[0049] Step 1: The BBU generates the calibration signal txCalSeq to be sent.

[0050] Step 2: Determine whether this calibration process is the first calibration process, if so, go to step 3, otherwise, go to step 4;

[0051] Step 3: Perform channel difference compensation on the calibration signal according to the phase compensation coefficient, that is, multiply the calibration signal by the phase compensation coefficient: txCalSeq_equalize=txCalSeq.PhaseCoeff, the phase compensation coefficient PhaseCoeff=1 or PhaseCoeff is the phase compensation coefficient obtained in the previous calibration cycle , and go to step 5;

[0052] Step 4: Perform channel difference compensation on the calibration signal according to the phase compensation coefficient, that is, multiply the calibration signal by the phase compensation coefficient, which is the phase compensation coefficient obtained in the previous calibration process;

...

Embodiment 2

[0075] For an 8-channel, 20MHz bandwidth TD-LTE system, such as Figure 5B As shown, the example of the scheme is as follows:

[0076] Step 1: Generate ZC sequence according to system bandwidth. When the system bandwidth is 20MHz, the ZC sequence selects 1200 points. Then distribute 1200 points of ZC to 8 sending channels, the specific implementation is as follows:

[0077] L=1200; %1200 point sequence length

[0078] N_ZC=max(primes(L));% Find the largest prime number

[0079] m_zc=1193;%sequence index

[0080] Xk _ ZC = exp ( - li * p * m _ zc * ( 0 : ( L - 1 ...

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Abstract

The present invention relates to the field of wireless communications. Disclosed are an antenna calibration (AC) method and base band unit (BBU) for improving AC accuracy. The technical solution provided in an embodiment of the present invention generates a calibration signal to be transmitted and then conducts a plurality of calibration processes in a current calibration period; in each calibration process, first conducting channel difference compensation for a calibration signal according to a phase compensation coefficient, and then transmitting the calibration signal via a transmission channel, thus reducing the peak-to-average ratio of the signal, and improving the accuracy of a final calibration result.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an antenna calibration method and a baseband device. Background technique [0002] Due to its advantages of improving cell coverage and suppressing signal interference, the smart antenna system has been used in Time Division Synchronized Code Division Multiple Access (TD-SCDMA), Time Division Long Term Evolution (TD-SCDMA Long Term Evolution, TD-LTE) and other mobile communication systems are widely used. Antenna calibration (antenna calibration, AC) is an operation that must be implemented when the base station works in the smart antenna mode. Its function is to eliminate the inconsistency (including amplitude and phase) between multiple channels, so as to achieve the following purposes: make the shape of the base station The result is close to the ideal result to achieve smart antenna gain; ensure the reciprocity of the uplink and downlink channels of the Time Division Du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/02H04B7/04H04B17/12H04L25/02
CPCH04B17/12
Inventor 李林
Owner DATANG MOBILE COMM EQUIP CO LTD
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