Multiplex communications – Communication over free space – Repeater
Patent
1996-11-05
2000-08-22
Nguyen, Chau
Multiplex communications
Communication over free space
Repeater
370506, 370514, H04J 307
Patent
active
061083194
ABSTRACT:
A rate alignment apparatus for a satellite includes an on-board clock, an input switch, an output switch and a ping-pong buffer pair including first and second buffers and connected to the input switch and the output switch. The first and second buffers receive a stream of digital baseband symbols recovered from an uplink signal depending on the operation of the input switch and the output switch. The first buffer of the buffer pair receives the bits in accordance with an uplink clock rate obtained from the uplink signal. The second buffer of the buffer pair substantially simultaneously empties the stored contents thereof to a third buffer in accordance with the on-board clock, the operations of the first and second buffers being reversed upon actuation of the input switch and the output switch. First and second correlators generate a spike when a header denoting when a frame in the stream of baseband symbols is detected. The buffer pair is operable to continue to write the stream of baseband symbols into one of the buffer pair until the spike occurs. The input switch and the output switch are switched to their reverse states, and the first and second buffers the uplink signal are read to the output thereof in accordance with the on-board clock rate. A sychronized pulse oscillator connected to the first and second correlators generates a smoothed pulse for each of the symbols read to the output. A counter connected to the oscillator counts the smoothed pulses. A number of bits is added to or removed from the headers of the streams in accordance with the value of the counter.
REFERENCES:
patent: 4199660 (1980-04-01), Dill et al.
patent: 4410980 (1983-10-01), Takasaki et al.
patent: 4425639 (1984-01-01), Acampora et al.
patent: 4660196 (1987-04-01), Gray et al.
patent: 4901310 (1990-02-01), Ichiyoshi
patent: 4931802 (1990-06-01), Assal et al.
patent: 5020057 (1991-05-01), Taniguchi et al.
patent: 5274627 (1993-12-01), De Santis
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 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: 5550812 (1996-08-01), Philips
patent: 5596582 (1997-01-01), Sato et al.
patent: 5661764 (1997-08-01), Nakajima
patent: 5689245 (1997-11-01), Noreen et al.
"Communications Satellites: orbiting into the 90"-August 1990 IEEE Spectrum, pp. 49-52.
"Nurld Space : The First DAB Satellite Services For The Nurld"Fournie et al., Oct. 10, 1995, pp. 1-7.
"Dig Al Audio Broadcasting: High Grade Service Quailty through On.Bas Processing Techniques", Fusquadro, G. (1995, John Wiley & Sons, Ltd.).
Nguyen Chau
WorldSpace International Networks, Inc.
LandOfFree
Satellite payload processing system providing on-board rate alig does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Satellite payload processing system providing on-board rate alig, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Satellite payload processing system providing on-board rate alig will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-589279