Patent US6501803B1 successfully refreshed from Google Patents.
US6501803B1
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Low complexity maximum likelihood detecting of concatenated space codes for wireless applications
Assignee: AT&T Mobility II LLC
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Filing: 1998-10-05
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Granted: 2002-12-31
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Expires: 2018-10-05
Abstract
Abstract Good transmission characteristics are achieved in the presence of fading with a transmitter that employs a trellis coder followed by a block coder. Correspondingly, the receiver comprises a Viterbi decoder followed by a block decoder. Advantageously, the block coder and decoder employ time-space diversity coding which, illustratively, employs two transmitter antennas and one receiver antenna.
Inventors
- 👤 Siavash Alamouti
- 👤 Patrick Poon
- 👤 Vahid Tarokh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:27
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03178; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/06; H04B7/0613; H04B7/0667; H04B7/0669; H04L1/00; H04L1/004; H04L1/0045; H04L1/0054; H04L1/0056; H04L1/0059; H04L1/006; H04L1/0064; H04L1/0065; H04L1/02; H04L1/06; H04L1/0618; H04L1/0631; H04L25/03331
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
166 words
A transmitter comprising: a trellis encoder that encodes incoming digital data to generate complex numbers representing constellation symbols defined as s 0 and s 1 , wherein the trellis encoder transmits by a first antenna and a second antenna, respectively, during a first time or frequency interval; a space-block encoder responsive to the constellation symbols to encode two adjacent constellation symbols as a block comprising two trellis-coded symbols and two parity symbols chosen from a group consisting of negated trellis-coded symbols, complex conjugates of the trellis-coded symbols, and negative complex conjugates of the trellis-coded symbols, wherein the space-block encoder is adapted to feed two antennas such that a different symbol is transmitted by each antenna; and wherein the symbols −s 1 * and s 0 * are generated by the space-block encoder and transmitted by the first antenna and the second antenna, respectively, during a second time or frequency interval, wherein s i * is defined as a complex conjugate of a symbol s i .
Claim 2
Dependent Claim
166 words
A transmitter comprising: a trellis encoder that encodes incoming digital data to generate complex numbers representing constellation symbols defined as s 0 and s 1 , wherein the trellis encoder transmits by a first antenna and a second antenna, respectively, during a first time or frequency interval; a space-block encoder responsive to the constellation symbols to encode two adjacent constellation symbols as a block comprising two trellis-coded symbols and two parity symbols chosen from a group consisting of negated trellis-coded symbols, complex conjugates of the trellis-coded symbols, and negative complex conjugates of the trellis-coded symbols, wherein the space-block encoder is adapted to feed two antennas such that a different symbol is transmitted by each antenna; and wherein the symbols −s 1 * and s 0 * are generated by the space-block encoder and transmitted by the first antenna and the second antenna, respectively, during a second time or frequency interval, wherein s i * is defined as a complex conjugate of a symbol s i .
Claim 3
Dependent Claim
14 words
The transmitter of claim 1 , wherein the space-block encoder is a multi-branch encoder.
Claim 4
Dependent Claim
14 words
The transmitter of claim 1 wherein the space-block encoder is a multi-branch space-block encoder.
Claim 5
Dependent Claim
14 words
The transmitter of claim 1 wherein the space-block encoder is a space-time block encoder.
Claim 6
Dependent Claim
14 words
The transmitter of claim 1 wherein the space-block encoder is a space-frequency block encoder.
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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) | 2005-12-30 | 2006-07-01 | 2006-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-12-30 | 2010-07-01 | 2010-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-12-30 | 2014-07-01 | 2014-12-31 | $7700.00 | Window Closed / Lapsed |