Method for transmitting intelligent antenna calibration sequence
A calibration sequence and smart antenna technology, applied in diversity/multi-antenna systems, space transmit diversity, etc., can solve problems such as not considering interference data, not being able to fully utilize the advantages of smart antennas, and not being able to guarantee the validity of calibration accuracy, so as to avoid calibration The effect of the precision effect
Inactive Publication Date: 2015-01-28
POTEVIO INFORMATION TECH CO LTD
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[0005] However, in the above antenna calibration algorithm, only the switching of the transceiver power amplifier, DwPTS and UpPTS are considered, and other interference data entering the GP are not considered. Especially for the TD-LTE system, there are nine special sub- Frame configuration, the smallest GP is only one Orthogonal Frequency Division Multiplexing (OFDM) symbol, which cannot completely avoid the interference of other base stations on the antenna calibration sequence, and cannot guarantee the validity of the calibration accuracy, so that the advantages of smart antennas cannot be fully utilized
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[0027] In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0028] The basic idea of the present invention is: before sending the calibration sequence each time, the idle GP is measured in real time, and the calibration sequence is sent in the measured non-interference area.
[0029] The specific implementation of the present invention will be described below through specific embodiments. image 3 It is a schematic flowchart of a method for sending a smart antenna calibration sequence in an embodiment of the present invention. Such as image 3 As shown, the method includes:
[0030] Step 301, before sending the calibration sequence each time, continuously receive N times of idle GP data.
[0031] Wherein, N is a preset integer. Since the present invention determines the interference currently suffered by the GP through...
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The invention provides a method for transmitting an intelligent antenna calibration sequence. The method comprises the following steps of: a, before transmitting the calibration sequence at each time, receiving GP (Guard Period) data for N times continuously, averaging amplitude information of the GP data received for N times to obtain an average sequence GP_P, wherein N is a preset integer; b, according to the average sequence GP_P, determining an undisturbed sequence region; if length of the undisturbed sequence region is greater than or equal to that of a current calibration sequence, transmitting the calibration sequence within the undisturbed sequence region; otherwise, un-transmitting the current calibrating sequence and carrying out the step c; and c, according to length L of the undisturbed sequence region, updating the length of the current calibration sequence, and transmitting the calibration sequence having an updated length within the undisturbed sequence region.
Description
technical field [0001] The invention relates to antenna calibration technology of a communication system, in particular to a method for sending a smart antenna calibration sequence. Background technique [0002] In Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system and Long Term Evolution (LTE) system, the beamforming technology based on smart antenna has been widely used, and the beamforming performance is largely Depends on the effect of smart antenna calibration. At present, the time domain calibration algorithm for TD-SCDMA system and the frequency domain calibration algorithm for LTE system have been developed and applied. These two calibration algorithms are both based on the principle of channel estimation, and both need to send a calibration sequence at the baseband or a remote radio unit (RRU). At present, the calibration sequences of the TD-SCDMA system and the TD-LTE system are sent in the guard interval (GP) of a special time slot (subfra...
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IPC IPC(8): H04B7/06
Inventor 吕伯轩胡炜雷旭卞立军
Owner POTEVIO INFORMATION TECH CO LTD