US6122269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packet radio systems
Assignee: Roke Manor Research Ltd
•
Filing: 1997-07-15
•
Granted: 2000-09-19
•
Expires: 2017-07-15
Abstract
Abstract A packet radio system is provided with a multiple access scheme which operates to schedule transmissions of data bearing radio packets on a common communications channel from a plurality of users to a common receiver of the said system. The radio packets via which the plurality of users communicate include synchronization data, and by providing the common receiver with a multi-user detector, contemporaneously transmitted packets may be detected and recovered in dependence upon the synchronization data, thereby substantially increasing a throughput of the packet radio system.
Inventors
- 👤 Stephen William Wales
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:48
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0071; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/18578; H04B7/18582; H04L1/0059; H04L1/006; H04L1/0064; H04L1/0066; H04L1/0045; H04L1/0054; H04L2001/0092; H04L2001/0093; H04W; H04W72/00; H04W72/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
A packet radio system, comprising a multiple access scheme which operates to schedule transmissions of data bearing radio packets on a common communications channel from a plurality of a users to a common receiver of said system, wherein: said radio packets include synchronization data and are arranged to be modulated in accordance with a trellis coded modulation scheme; said common receiver includes a multi-user detector which operates to detect and recover contemporaneously transmitted packets in dependence upon said synchronization data, thereby substantially increasing a throughput of said packet radio system; and radio packets which are contemporaneously transmitted on said common communications channel are arranged to be re-transmitted with substantially different synchronization data and are arranged to be modulated with substantially different trellis codes.
Claim 2
Dependent Claim
123 words
A packet radio system, comprising a multiple access scheme which operates to schedule transmissions of data bearing radio packets on a common communications channel from a plurality of a users to a common receiver of said system, wherein: said radio packets include synchronization data and are arranged to be modulated in accordance with a trellis coded modulation scheme; said common receiver includes a multi-user detector which operates to detect and recover contemporaneously transmitted packets in dependence upon said synchronization data, thereby substantially increasing a throughput of said packet radio system; and radio packets which are contemporaneously transmitted on said common communications channel are arranged to be re-transmitted with substantially different synchronization data and are arranged to be modulated with substantially different trellis codes.
Claim 3
Dependent Claim
26 words
A packet radio system as claimed in claim 1, wherein each of the plurality of users arranges to transmit radio packets with substantially different synchronization data.
Claim 4
Dependent Claim
29 words
A packet radio system as claimed in claim 1, wherein each of the plurality of users arranges to trellis code modulate radio packets with a substantially different trellis code.
Claim 5
Dependent Claim
44 words
A method of multiplexing packets of data bearing radio packets on a common communications channel as claimed in claim 3, further comprising: arranging for each of a plurality of contemporaneously transmitted trellis code modulated radio packets to be modulated with a different trellis code.
Claim 6
Dependent Claim
62 words
A method of multiplexing packets of data bearing radio signals on a common communications channel as claimed in claim 4, wherein the radio packets are generated by a plurality of users pursuant to communicating via transmission of the said radio packets, further comprising: arranging for each user to modulate trellis code modulated radio packets transmitted thereby with a substantially different trellis code.
Claim 7
Independent Claim
98 words
A method of multiplexing packets of data bearing radio packets on a common communications channel, comprising: modulating said radio packets in accordance with a trellis coded modulation scheme; arranging for said trellis code modulated packets to be transmitted on said common communication channel in accordance with a multiple access scheme; detecting collisions of said trellis code modulated packets resulting from contemporaneous transmission; arranging for collided packets to be re-transmitted with substantially different synchronization data; resolving any subsequently colliding re-transmitted radio packets in accordance with a multi-user detection process in dependence upon said synchronization data and said trellis codes.
Claim 8
Independent Claim
98 words
A method of multiplexing packets of data bearing radio packets on a common communications channel, comprising: modulating said radio packets in accordance with a trellis coded modulation scheme; arranging for said trellis code modulated packets to be transmitted on said common communication channel in accordance with a multiple access scheme; detecting collisions of said trellis code modulated packets resulting from contemporaneous transmission; arranging for collided packets to be re-transmitted with substantially different synchronization data; resolving any subsequently colliding re-transmitted radio packets in accordance with a multi-user detection process in dependence upon said synchronization data and said trellis codes.
Claim 9
Dependent Claim
46 words
A method of multiplexing packets of data bearing radio packets on a common communication channel as claimed in claim 6, further comprising: adapting a super-state trellis of a sequence estimator of said multi-user detector in accordance with trellis codes with which said radio packets were modulated.
References Cited (Backward Citations)
US5014272A
Cited
US5307341A
Cited
US5103459A
Cited
US5103459B1
Cited
US5640432A
Cited
US5956646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-09-19 | 2004-03-20 | 2004-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-09-19 | 2008-03-20 | 2008-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-09-19 | 2012-03-20 | 2012-09-19 | $7700.00 | Window Closed / Lapsed |