Satellite payload processing system using polyphase...

Details Satellite payload processing system using polyphase... Satellite payload processing system using polyphase...

1999-03-09

2003-04-01

Bost, Dwayne (Department: 2681)

Multiplex communications

Communication over free space

Repeater

C370S316000, C370S506000, C370S514000

Reexamination Certificate

active

06542480

ABSTRACT:

FIELD OF INVENTION
The invention relates to satellite payload processing systems and recovery of digital baseband signals from uplink transmissions.
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 stream.
SUMMARY OF THE INVENTION
In accordance with an aspect of the present invention, a satellite payload processing system for processing a single-channel-per-carrier, frequency division multiple access uplink signal is provided which comprises a polyphase demultiplexer processor for separating the uplink signal into a time division multiplexed data stream of symbols. The polyphase demultiplexer processor presents the symbols corresponding to each of a plurality of carriers at respective ones of the frequencies in the uplink signal sequentially to an output of said polyphase demultiplexer processor. A phase shift keying demodulator is connected to the output of the polyphase demultiplexer processor for demodulating the stream of symbols into corresponding time division multiplexed stream of digital baseband bits.


REFERENCES:
patent: 4385381 (1983-05-01), Alexis
patent: 4425639 (1984-01-01), Acampora et al.
patent: 4660196 (1987-04-01), Gray et al.
patent: 4881222 (1989-11-01), Goeckler et al.
patent: 4901310 (1990-02-01), Ichiyoshi
patent: 4931802 (1990-06-01), Assal et al.
patent: 5148452 (1992-09-01), Kennedy et al.
patent: 5274627 (1993-12-01), De Santis
patent: 5278837 (1994-01-01), Kelley
patent: 5283780 (1994-02-01), Schuchman et al.
patent: 5293382 (1994-03-01), Carson et al.
patent: 5299192 (1994-03-01), Guo et al.
patent: 5303393 (1994-04-01), Noreen et al.
patent: 5347548 (1994-09-01), Messerges et al.
patent: 5416774 (1995-05-01), Shigematsu et al.
patent: 5455823 (1995-10-01), Noreen et al.
patent: 5473601 (1995-12-01), Rosen et al.
patent: 5521943 (1996-05-01), Dambacher
patent: 5550812 (1996-08-01), Philips
patent: 5555547 (1996-09-01), Lemaitre et al.
patent: 5663986 (1997-09-01), Striffler
patent: 5668842 (1997-09-01), Sorace et al.
patent: 5689245 (1997-11-01), Noreen et al.
patent: 5796726 (1998-08-01), Hassan et al.
patent: 5867490 (1999-02-01), Campanella
patent: 6108317 (2000-08-01), Jones et al.
patent: 6108319 (2000-08-01), Campanella
patent: 6333922 (2001-12-01), Campanella
patent: 0493784 (1994-02-01), None
“Communications Satellites: Orbiting into the '90s”, Aug. 1990,IEEE Spectrum, pp. 49-52.
“WorldSpace: The First DAB Satellite Service for the World”, Fourni′e et al., Oct. 10, 1995, pp. 1-7.

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