Antenna unit and radio base station therewith

• US 20070293269A1
• Filed: 03/09/2007
• Published: 12/20/2007
• Est. Priority Date: 09/14/1999
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: KDDI Corporation
• Inventors: Kuwahara, Mikio, Doi, Nobukazu, Suzuki, Toshiro, Ishida, Yuji, Inoue, Takashi, Niida, Sumaru
• Granted Patent: US 7,587,174 B2
• Time in Patent Office: Days
• US Class Current: 455/562.1
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 3/267 Phased-array testing or checking devices
• CPC Class Codes: H01Q 3/30 varying the relative phase between the radiating elements of an array H01Q3/2605, H01Q3/2658, H01Q3/2682, H01Q3/44 take precedence
• CPC Class Codes: H04B 17/12 of transmit antennas, e.g. of the amplitude or phase
• CPC Class Codes: H04B 17/20 of receivers
• 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
• CPC Class Codes: H04W 16/28 using beam steering

Abstract

A radio base station apparatus provided with an array antenna having a plurality of antenna elements for calibrating a phase difference among the array antenna elements. The base station has a probe signal adding unit which divides one probe signal and adds the divided probe signals to each receive signals received by the plurality of antenna elements. A probe data extracting unit extracts the probe data from the receive signals added with the probe signal. A phase calibration calculation unit calculates correlating phase calibration values required for calibrating a phase of each receive signal based on the probe data extracted by the probe signal extracting unit. A phase calibration unit calibrates a phase difference among the array antenna elements by calibrating the phase of the each receive signal based on the phase calibration from the phase calibration calculation unit.

Claims

1. A radio base station apparatus provided with an array antenna having a plurality of antenna elements for calibrating a phase difference among the array antenna elements, comprising:

a probe signal adding unit which divides a one probe signal and adds the divided probe signals to each of receive signals received by said plurality of antenna elements;

a probe data extracting unit which extracts the probe data from said receive signals added with the probe signal;

a phase calibration calculation unit which calculates correlating phase calibration values required for calibrating a phase of each receive signal based on the probe data extracted by said probe signal extracting unit; and

a phase calibration unit for calibrating a phase difference among the array antenna elements by calibrating said phase of the each receive signal based on the phase calibration from said phase calibration calculation unit.