US6188736B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Near-optimal low-complexity decoding of space-time codes for fixed wireless applications
Assignee: AT&T Mobility II LLC
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Filing: 1998-04-21
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Granted: 2001-02-13
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Expires: 2018-04-21
Abstract
Abstract An improved multi-antenna receiver is realized for detecting signals transmitted by a multi-antenna transmitter by summing signals received at the plurality of receiver antennas after multiplying each by a respective constant. The summed signal is applied to a maximum likelihood detector. The respective constants, λ j , where j is an index designating a particular receiver antenna, are determined by evaluating the largest eigenvector of the matrix A, where Λ is a vector containing the values λ j , and A is a matrix containing elements α ij , which is the transfer function between the i th transmitter antenna to the j th receiver antenna. The α ij terms are determined in the receiver in conventional ways.
Inventors
- 👤 Titus Lo
- 👤 Vahid Tarokh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:18
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/02; H04L1/06; H04L1/0612; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0837; H04B7/0842; H04B7/0848; H04B7/0854; H04L1/004; H04L1/0045; H04L1/0054; H04L1/0618; H04L1/0631
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
A receiver comprising: an n plurality of antennas, where n is greater than one; circuitry for obtaining n signals transmitted from m antennas of a transmitter, where m is greater than one; and processing means for developing a sum signal that corresponds to the addition of said n signals that are each pre-multiplied by a respective factor λ j , where j is an index integer specifying that factor λ j multiplies the signal received from antenna j of said n plurality of antennas, developing values for transfer functions α ij , where i is an index that references said transmitting antennas, and j is an index that references said receiving antennas, developing said factors λ j from said transfer functions, where said factors are components of a vector Λ where Λ is an eigenvector of A, and where A is a matrix containing said elements α ij , and detecting symbols transmitted by said m transmitter antennas embedded in said sum signal.
Claim 2
Dependent Claim
163 words
A receiver comprising: an n plurality of antennas, where n is greater than one; circuitry for obtaining n signals transmitted from m antennas of a transmitter, where m is greater than one; and processing means for developing a sum signal that corresponds to the addition of said n signals that are each pre-multiplied by a respective factor λ j , where j is an index integer specifying that factor λ j multiplies the signal received from antenna j of said n plurality of antennas, developing values for transfer functions α ij , where i is an index that references said transmitting antennas, and j is an index that references said receiving antennas, developing said factors λ j from said transfer functions, where said factors are components of a vector Λ where Λ is an eigenvector of A, and where A is a matrix containing said elements α ij , and detecting symbols transmitted by said m transmitter antennas embedded in said sum signal.
Claim 3
Dependent Claim
38 words
The receiver of claim 1 where said detecting compares said sum signal to a signal corresponding to symbols c i possibly transmitted by transmitting antenna i of said m transmitting antennas multiplied by corresponding factors γ i .
Claim 4
Dependent Claim
33 words
The receiver of claim 2 where said corresponding factor γ i is related to said factors λ j , for j=1, 2, 3, . . . , m, and to α ij .
Claim 5
Dependent Claim
75 words
The receiver of claim 2 where said detecting minimizes the metric ∑ t = 1 L R t - ∑ i = 1 n γ i c t i 2 , where R t is said sum signal at time interval t within a frame having L time intervals, and c t i is the symbol that might have been transmitted over transmitting antenna i at time interval t.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-02-13 | 2004-08-14 | 2005-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-02-13 | 2008-08-14 | 2009-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-02-13 | 2012-08-14 | 2013-02-13 | $7700.00 | Window Closed / Lapsed |