Wireless apparatus for measuring a received wireless signal and measurement system using the wireless apparatus

• US 8,320,270 B2
• Filed: 06/10/2008
• Issued: 11/27/2012
• Est. Priority Date: 06/13/2007
• Status: Expired due to Fees

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Iwami, Masashi, Ozeki, Takashi
• Primary Examiner(s): ROSE, KERRI M
• Application Number:
  US12/664,047
• Publication Number:
  US 20100182922A1
• Time in Patent Office: 1,631 Days
• Field of Search: 370/252, 370/329, 370/339, 370/350, 370/503, 455450-4522, 455/63.4, 455/428
• US Class Current: 370/252
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/086 using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming

Abstract

A base station apparatus switches between a communication mode for performing communication with a communication party and a calibration mode for performing a calibration process. In the calibration mode, a weight vector in accordance with a first algorithm for performing a null steering directivity control for orienting an area of drastically-lowered antenna gain in the direction of arrival of a reception signal. Furthermore, multiple transmission signals weighted by the acquired weight vector are output, and a correction value for readjusting the result of the null steering directivity control is acquired from a control PC. In the communication mode, multiple transmission signals are corrected by using the correction value acquired in a calibration mode, and the corrected signals are output.

Claims

1. A wireless apparatus comprising:

a mode selector operative to select a communication mode for performing communication with a wireless apparatus to be communicated or a calibration mode for a calibration process;

a weight vector acquirer operative to acquire a weight vector by executing a first algorithm, which is for a null steering directivity control, on a plurality of reception signals when the calibration mode is being selected by the mode selector and to acquire a weight vector by executing a second algorithm different from the first algorithm when the communication mode is being selected by the mode selector, wherein the plurality of reception signals are generated by a single signal source;

an outputter operative to output a plurality of transmission signals weighted by the weight vector acquired by the weight vector acquirer; and

a correction value acquirer operative to acquire a correction value for readjusting the result of the null steering directivity control after the transmission signals are output by the outputter when the calibration mode is being selected by the mode selector, wherein

the outputter outputs a plurality of transmission signals after correcting the transmission signals by using the correction value acquired by the correction value acquirer when the communication mode is being selected by the mode selector.

2. A measurement system comprising:

a signal generation apparatus operative to generate a plurality of signals for performing a calibration process;

a wireless apparatus operative to receive the plurality of signals generated by the signal generation apparatus and output transmission signals by performing the calibration process based on the received signals;

a measurement apparatus operative to measure the transmission signals output from the wireless apparatus; and

a control apparatus operative to control the wireless apparatus based on the result of the measurement apparatus, wherein

the wireless apparatus comprises;

a mode selector operative to select a communication mode for performing communication with a wireless apparatus to be communicated or a calibration mode for a calibration process;

a weight vector acquirer operative to acquire a weight vector by executing a first algorithm, which is for a null steering directivity control, on a plurality of calibration-reception signals received from the signal generation apparatus when the calibration mode is being selected by the mode selector and to acquire a weight vector by executing a second algorithm different from the first algorithm when the communication mode is being selected by the mode selector, wherein the plurality of calibration-reception signals are generated by a single signal source;

an outputter operative to output a plurality of transmission signals weighted by the weight vector acquired by the weight vector acquirer; and

a correction value acquirer operative to acquire, from the control apparatus, a correction value for readjusting the result of the null steering directivity control after the transmission signals are output by the outputter when the calibration mode is being selected by the mode selector, wherein

the outputter outputs a plurality of transmission signals after correcting the transmission signals by using the correction value acquired by the correction value acquirer when the communication mode is being selected by the mode selector.