Communications apparatus using adaptive antenna

• US 7,499,727 B2
• Filed: 01/09/2004
• Issued: 03/03/2009
• Est. Priority Date: 01/10/2003
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Toda, Takeshi, Nakaya, Yuta, Oishi, Yasuyuki, Hara, Shinsuke
• Primary Examiner(s): Le; Nhan T
• Application Number:
  US10/754,815
• Publication Number:
  US 20040139897A1
• Time in Patent Office: 1,880 Days
• Field of Search: 342/380, 342/383, 342/359, 342/367, 342/368, 455/130, 455/132, 455/133, 455/140, 455/143, 455/272, 455/561, 455/562, 455/450, 455/452.1, 455/2, 455/575.7, 455/452.2, 375/345, 375/144, 375/147, 375/148, 375/347, 343/749, 343/750, 343/751
• US Class Current: 455/562.1
• CPC Class Codes: H04B 17/20 of receivers
• CPC Class Codes: H04B 7/0842 Weighted combining

Abstract

A communications apparatus using an adaptive antenna having in a high frequency unit an antenna unit including a plurality of antenna elements and a plurality of adjustment units, provided corresponding to the plurality of antenna elements, for adjusting directivity of an entire antenna, the communications apparatus including an interference wave element extraction unit for extracting an interference wave element other than a requested signal from a received signal by the antenna unit when an adjustment value of the adjustment unit is perturbed in a one symbol time, and an adaptive control unit for performing adaptive control on the adjustment value such that the extracted interference wave element can be minimized.

Claims

1. A wireless-communication apparatus comprising a feed antenna element, a plurality of no-feed antenna elements, and a plurality of variable reactance units respectively connected to the plurality of no-feed antenna elements, and controlling directivity of an antenna by adjusting the plurality of variable reactance units, comprising:

an adjustment unit performing perturbation control so that each period to temporarily change reactance of each of the plurality of variable reactance units is shorter than a period in which the perturbation control is not performed for any of the plurality of variable reactance units,

wherein the wireless-communication apparatus controls the directivity of the antenna on the basis of received signals respectively received in the period in which the perturbation control is not performed for any of the plurality of variable reactance units and a period in which the perturbation control provides perturbation.

2. The wireless-communication apparatus according to claim 1, wherein

the period in which the perturbation control is not performed for any of the plurality of variable reactance units corresponds to one symbol time.

3. The wireless-communication apparatus according to claim 1, wherein

time required to provide perturbation in turn for all of the plurality of variable reactance units falls within one symbol time.

4. A wireless-communication method implemented in an apparatus comprising a feed antenna element, a plurality of no-feed antenna elements, and a plurality of variable reactance units respectively connected to the plurality of no-feed antenna elements, and controlling directivity of an antenna by adjusting the plurality of variable reactance units, said method comprising:

performing perturbation control so that each period to temporarily change reactance of each of the plurality of variable reactance units is shorter than a period in which the perturbation control is not performed for any of the plurality of variable reactance units,

wherein the apparatus controls the directivity of the antenna on the basis of received signals respectively received in the period in which the perturbation control is not performed for any of the plurality of variable reactance units and a period in which the perturbation control provides perturbation.

5. The wireless-communication method according to claim 4, wherein

the period in which the perturbation control is not performed for any of the plurality of variable reactance units corresponds to one symbol time.

6. The wireless-communication method according to claim 4, wherein

time required to provide perturbation in turn for all of the plurality of variable reactance units falls within one symbol time.