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EP0654915A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Multipathreception using matrix calculation and adaptive beamforming

Assignee: AT&T Inc
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Filing: 1994-11-09
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Granted: —
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Expires: 2014-11-09
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Abstract

Abstract Signals from multiple signal paths are received using a multi-element antenna (20) and a beam-forming network (36). Signals from each of the antenna elements are sampled (34) to form a sample vector. Several sample vectors are used to form an auto-covariance matrix. A singular value decomposition of the auto-covariance matrix is used to form three matrices. The first matrix is used to determine the number of signal paths and the second matrix is used to form several polynomials. The polynomial roots that are on or near the unit circle are used to determine points on the unit circle that are associated with each signal path. Each point on the unit circle is used to calculate weights for a beam-forming network (36) that forms a receive beam for each signal path. <IMAGE>

Inventors

  • 👤 Debajyoti Pal

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 16:01
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/005; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/2605

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 75 words
A method of receiving communication signals in a multi-path environment, characterized by the steps of: receiving a signal having a plurality of angles of arrival using a plurality of antenna elements, said plurality of elements providing a plurality of element signals; sampling said plurality of signals to form a sample set; and using a plurality of sample sets to form a receive beam corresponding to at least one of said plurality of angles of arrival.
Claim 2
Dependent Claim 37 words
A method as claimed in claim 1, wherein said step of forming a receive beam comprises forming a plurality of receive beams corresponding to said plurality of angles of arrival to produce a plurality of beam signals.
Claim 3
Dependent Claim 29 words
A method as claimed in claim 2, comprising the step of selecting a first beam signal from said plurality of beam signals based on a signal to noise ratio.
Claim 4
Dependent Claim 31 words
A method as claimed in claim 2, comprising the steps of time aligning a first beam signal and a second beam signal, and summing said first and said second beam signals.
Claim 5
Dependent Claim 32 words
A method as claimed in claim 4, wherein said step of time aligning comprises correlating a predefined sequence in said first beam signal with said predefined sequence in said second beam signal.
Claim 6
Dependent Claim 28 words
A cellular telephone, characterized by: means for determining an angle of arrival of a signal; and means for forming a receive beam corresponding to said angle of arrival.
Claim 7
Dependent Claim 20 words
A cellular telephone as claimed in claim 6, wherein said means for forming a receive beam comprises a multi-element antenna.

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