Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
1998-04-07
2001-02-06
Vo, Don N. (Department: 2734)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C714S795000
Reexamination Certificate
active
06185265
ABSTRACT:
FIELD OF INVENTION
The invention relates to a system for coding broadcast channels using R-½ or R-¾ convolutional coders for satellite transmission via an on-board baseband processing payload or a transparent payload, respectively, and formatting R-½ or R-¾ convolutional coded broadcast channel frames into TDM frames for transmission via a selected one of the L-band or the S-band.
BACKGROUND OF THE INVENTION
There presently exists a population of over 4 billion people that are generally dissatisfied and underserved by the poor sound quality of short-wave radio broadcasts, or the coverage limitations of amplitude modulation (AM) band and frequency modulation (FM) band terrestrial radio broadcast systems. This population is primarily located in Africa, Central and South America, and Asia. A need therefore exists for a satellite-based direct radio broadcast system to transmit signals such as audio, data and images to low-cost consumer receivers.
A number of satellite communications networks have been developed for commercial and military applications. These satellite communications systems, however, have not addressed the need to provide multiple, independent broadcast service providers with flexible and economical access to a space segment, nor consumers' need to receive high quality radio signals using low-cost consumer radio receiver units. A need therefore exists for providing service providers with direct access to a satellite and choices as to the amount of space segment that's purchased and used. In addition, a need exists for a low-cost radio receiver unit capable of receiving time division multiplexed downlink bit streams.
SUMMARY OF THE INVENTION
In accordance with an aspect of the present invention, a broadcast station generates prime rate channels for broadcast transmission to radio receivers via a TDM bit stream whereby a broadcast channel frame is encoded for forward error correction (FEC) using a concatenated coding scheme. A Reed-Solomon coder is concatenated with an interleaver, and then with an R-¾ Viterbi coder. The FEC-encoded broadcast channel frame is then demultiplexed into prime rate channels that are formatted for transmission via a time division multiplexed bit stream.
In accordance with another aspect of the present invention, a system for formatting a signal for broadcast transmission to remote receivers is provided whereby a broadcast station generates a TDM bit stream from broadcast channels for transmission to radio receivers via transparent “bent-pipe” payloads on-board a satellite.
REFERENCES:
patent: 3789142 (1974-01-01), Shimasaki et al.
patent: 4425639 (1984-01-01), Acampora et al.
patent: 4480328 (1984-10-01), Alaria et al.
patent: 4660196 (1987-04-01), Gray et al.
patent: 4881241 (1989-11-01), Pommier et al.
patent: 4901310 (1990-02-01), Ichiyoshi
patent: 4931802 (1990-06-01), Assal et al.
patent: 5191576 (1993-03-01), Pommier et al.
patent: 5197061 (1993-03-01), Halbert-Lassalle
patent: 5228025 (1993-07-01), Le Floch et al.
patent: 5283780 (1994-02-01), Schuchman et al.
patent: 5299192 (1994-03-01), Guo et al.
patent: 5303393 (1994-04-01), Noreen et al.
patent: 5347548 (1994-09-01), Messerges
patent: 5416774 (1995-05-01), Shigematsu
patent: 5442625 (1995-08-01), Gitlin et al.
patent: 5455823 (1995-10-01), Noreen et al.
patent: 5473601 (1995-12-01), Rosen et al.
patent: 5485464 (1996-01-01), Strodtbeck et al.
patent: 5550812 (1996-08-01), Philips
patent: 5568483 (1996-10-01), Padovani et al.
patent: 5625624 (1997-04-01), Rosen et al.
patent: 5638408 (1997-06-01), Takaki
patent: 5689245 (1997-11-01), Noreen et al.
patent: 5898680 (1999-04-01), Johnstone et al.
S. Joseph Campanella, “Communications Satellites: Orbitting Into the 90's”,IEEE Spectrum, pp. 49-52, Aug. 1990.
G. Losquadro, “Digital Audio Broadcasting: High-Grade Service Quality Through On-Board Processing Techniques”,SAT: Satellite Communications, Jul. 31, 1995, pp. 1-9.
Maral, Gerard,VSAT Networks, pp. 52-53 (John Wiley & Sons, Ltd., 1995).
Chitre, D.M., “The Role of Satellite Communications in the ISDN Era”,International Journal of Satellite Communications, vol. 10, No. 5, Sep.-Oct. 1992, pp. 210-215.
Chitre, D.M. et al, “Architectures for the Intelsat NISDN-Compatible Satellite Communications Network”,International Journal of Satellite Communications, vol. 10, pp. 217-225 (1992).
Digital Audio Broadcast, Stanford Telecom, STEL-VPR-0538, Apr. 1991.
Proceedings from Second International Symposium on Digital Audio Broadcasting: the Sound of 2000, Toronto, Canada, Mar. 14-17, 1994, vol. II, pp. 63-108 and pp. 240-248.
Principles for the Guidance of EBU Members for WARC-92 Broadcasting-Satellite Service, European Broadcasting Union, Feb. 1991 Draft SPB 483-E, pp. 1-75.
Annex C to ITU-R Special Publication on Terrestrial and Satellite Digital Sound Broadcasting to Vehicular Portable and Fixed Receivers in the VHF/UHF Bands on “Digital System B”, Nov. 1, 1994.
Amendment to Communications Subsystem in Application of Satellite CD Radio Inc. before the Federal Communications Commission, pp. 1-16.
The Eureka 147 Project, Digital Audio Broadcasting System, DAB Project Office, Germany, pp. 1-11.
Advanced Digital Techniques for UHF Satellite Sound Broadcasting: Collected Papers on Concepts for Sound Broadcasting Into the 21st Century; European Broadcasting Union, Extracted from EBU Document SPB 442, Jan. 1998, pp. 11-69.
Le Floch et al; Digital Sound Broadcasting to Mobile Receivers, IEEE Transactions on Consumer Electronics, Aug. 1989, vol. 35, No. 3, pp. 493-503.
Roylance Abrams Berdo & Goodman
Vo Don N.
WorldSpace Management Corp.
LandOfFree
System for time division multiplexing broadcast channels... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for time division multiplexing broadcast channels..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for time division multiplexing broadcast channels... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2579249