Adaptive antenna

• US 6,061,553 A
• Filed: 01/02/1998
• Issued: 05/09/2000
• Est. Priority Date: 01/07/1997
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Tsujimura, Akihiro, Matsuoka, Hidehiro, Murakami, Yasushi, Shoki, Hiroki
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): BANKS HAROLD, MARSHA DENISE
• Application Number:
  US09/002,394
• Time in Patent Office: 858 Days
• Field of Search: 455/18, 455/25, 455/550, 455/132, 455/137, 455/272, 455/273, 455/277.1, 455/277.2, 455/278.1, 455/296, 455/334, 455/562, 342/383, 342/380, 342/375, 342/374
• US Class Current: 455/273
• CPC Class Codes: H01Q 3/2605 Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
• CPC Class Codes: H01Q 3/2611 Means for null steering; Adaptive interference nulling
• CPC Class Codes: H01Q 3/2652 Self-phasing arrays

Abstract

An adaptive antenna is disclosed, that comprises a plurality of antenna elements 1₁, 1₂, . . . , and 1_N with different directivity, delay profile measuring units 2₁, 2₂, . . . , and 2_N for estimating states of received signals of the antenna elements for each of delay times that have been designated, antenna selecting units 3₁, 3₂, . . . , and 3_L for selecting a part of the antenna elements for each of the delay times corresponding to the estimated result, adaptive signal processing portions 4₁, 4₂, . . . , and 4_L for determining the received signals of the part of the antenna elements that have been selected and multiplying the received signals to which relevant weights have been determined for each of the delay time and summing the weighted signals, delaying circuits 5₂ and 5₃ for compensating the time lag, or delay of each of the received signals for each of the delay times, and a combining unit 6 for combining the weighted signals that have been compensated for the delay times.

Claims

1. An adaptive antenna, comprising:

a plurality of antenna elements with different directivity;

estimating means for estimating states of received signals of said antenna elements for each of delay times that have been designated;

selecting means for selecting a part of said antenna elements for each of the delay times corresponding to the estimated result;

weighting means for determining the received signals of the part of said antenna elements selected by said selecting means by relevant weights;

first combining means for multiplying the received signals to which relevant weights have been determined for each of the delay time and summing the weighted signals;

compensating means for compensating the time lag, or time delay of each of the received signals for each of the delay times; and

second combining means for combining the compensated signals for the delay times.

2. The adaptive antenna as set forth in claim 1,

wherein said estimating means estimates the power, intensity, or signal-to-noise ratio of the received desired signals of said antenna elements for each of the delay times.

3. The adaptive antenna as set forth in claim 2,

wherein said selecting means selects some antenna elements with larger power, intensity, or signal-to-noise ratio of the received desired signal for each of the delay times corresponding to the estimated result.

4. The adaptive antenna as set forth in claim 2,

wherein said selecting means selects at least one first antenna element and at least one second antenna element corresponding to the estimated result, the first antenna elements having larger power, intensity, or signal-to-noise ratio of the received desired signals for a each of the delay time, the second antenna elements having larger power, intensity, or signal-to-noise ratio of the received undesired delayed signals for each of the delay times.

5. The adaptive antenna as set forth in claim 2,

wherein said selecting means selects at least one first antenna element and at least one second antenna element corresponding to the estimated result, the first antenna elements having larger power, intensity, or signal-to-noise ratio of the received desired signals for a each of the delay time, the second antenna elements having larger power, intensity, or signal-to-noise ratio of the received interference signals for each of the delay times.

6. The adaptive antenna as set forth in claim 5,

wherein said second selecting means has:

means for generating replicas of signals that said antenna elements receive for each of the delay times corresponding to the estimated result and estimating interference signal signals that said antenna elements receive corresponding to the generated replicas and the received signals of said antenna elements; and

means for selecting the second antenna element corresponding to the estimated result of the interference signal signals.

7. An adaptive antenna, comprising:

a plurality of antenna elements for generating respective beams with different directivity;

estimating means for estimating states of received signals of beams of said antenna elements for each of delay times that have been designated;

selecting means for selecting one beam of a part of said antenna elements corresponding to the estimated result;

weighting means for determining the received signals of the beams of the part of said antenna elements selected by said selecting means by relevant weights;

first combining means for multiplying the received signals to which relevant weights have been determined for each of the delay time and summing the weighted signals;

compensating means for compensating the time lag, or time delay of each of the received signals for each of the delay times; and

second combining means for combining the compensated signals for the delay times.

8. The adaptive antenna as set forth in claim 7,

wherein said estimating means estimates the power, intensity, or signal-to-noise ratio of the received signals of beams of said antenna elements for each of the delay times.