RADIO APPARATUS AND DETECTION METHOD

• US 20180054263A1
• Filed: 07/18/2017
• Published: 02/22/2018
• Est. Priority Date: 08/22/2016
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Manpo, Mitsuhiko, FUJII, KENICHI, Shioya, Naoki, TSUJIMOTO, TAKESHI, KURAMOTO, KEIGO, Matsuno, Narito, Nakajima, Yasuo
• Application Number:
  US15/652,850
• Publication Number:
  US 20180054263A1
• Time in Patent Office: Days
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 3/267 Phased-array testing or checking devices
• CPC Class Codes: H04B 1/44 Transmit/receive switching
• CPC Class Codes: H04B 17/12 of transmit antennas, e.g. of the amplitude or phase
• CPC Class Codes: H04L 5/16 Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

There is provided a radio apparatus including: a radio transceiver configured to transmit and receive a signal via a plurality of antennas; and a processor configured to control the radio transceiver so that a signal transmitted by a first antenna among the plurality of antennas is received by second and third antennas neighboring the first antenna and detect at least difference between amplitudes of the signals received by the respective second and third antennas or difference between phases of the signals received by the respective second and third antennas.

Claims

1. A radio apparatus comprising:

a radio transceiver configured to transmit and receive a signal via a plurality of antennas; and

a processor configured to control the radio transceiver so that a signal transmitted by a first antenna among the plurality of antennas is received by second and third antennas neighboring the first antenna and detect at least one of difference between amplitudes of signals received by the respective second and third antennas and difference between phases of the signals received by the respective second and third antennas.

2. The radio apparatus according to claim 1,

wherein distance between the first and second antennas and distance between the first and third antennas are the same, and

wherein the processor corrects at least one of an error between the amplitudes of the signals received by the respective second and third antennas on the basis of the difference between the amplitudes and an error between the phases of the signals received by the respective second and third antennas on the basis of the difference between the phases.

3. The radio apparatus according to claim 1,

wherein the radio transceiver transmits and receives a signal by using a time division duplex transmission method in which, when uplink and downlink frames are switched, a predetermined frame in which neither transmission nor reception is performed is inserted between the uplink and downlink frames, and

wherein the processor causes the radio transceiver to transmit and receive a signal for detecting at least one of the differences by using the predetermined frame.

4. The radio apparatus according to claim 2,

wherein a number of antennas is an even number of 4 or more, and

wherein the processor corrects at least one of the errors among odd-numbered antennas of the plurality of antennas, corrects at least one of the errors among even-numbered antennas of the plurality of antennas, and corrects at least one error caused between signals received by the odd-numbered antennas and signals received by the even-numbered antennas.

5. The radio apparatus according to claim 1,

wherein the processor controls the radio transceiver so that signals transmitted by fifth and sixth antennas neighboring a fourth antenna among the plurality of antennas are received by the fourth antenna, and

wherein the processor detects at least one of difference between amplitudes of the signals transmitted by the respective fifth and sixth antennas and difference between phases of the signals transmitted by the respective fifth and sixth antennas.

6. A detection method, comprising:

causing, by a processor, a radio apparatus including a radio transceiver that transmits and receives a signal via a plurality of antennas and the processor, to control the radio transceiver so that a signal transmitted by a first antenna among the plurality of antennas is received by second and third antennas neighboring the first antenna; and

causing, by the processor, the radio apparatus to detect at least one of difference between amplitudes of signals received by the respective second and third antennas and difference between phases of the signals received by the respective second and third antennas.