Patent EP0327101A2 successfully refreshed from Google Patents.
EP0327101A2
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EP
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Satellite communication system with variable coding rate
Assignee: NEC Corp
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Filing: 1989-02-03
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Granted: —
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Expires: 2009-02-03
Abstract
Abstract A satellite communication system with a variable coding rate maintains all the channels connectable at all times without resorting to an extra frequency band associated with one carrier wave on a satellite transponder and otherwise required to accommodate the simultaneous occurrence of multiple call requests which is rare. The system selectively changes the coding rate of data to implement the transmission of massive data without the need for an increase in the frequency band on a satellite transponder, contributing a great deal to the efficient use of frequency bands available with a satellite transponder
Inventors
- 👤 Tomoyuki C/O Nec Corporation Ooi
- 👤 Yasuhito C/O Nec Corporation Isoe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 19:25
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/22; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/1851; H04B7/18517; H04J; H04J3/00; H04J3/16; H04J3/1682; H04J3/1688
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
235 words
In a satellite communication system with a variable coding rate comprising transmit terminal equipment a receive terminal equipment, said transmit terminal equipment comprising: data multiplexing means for multiplexing transmit data applied over a plurality of channels; data amount detecting means for determining whether or not an amount of the transmit data is greater than a predetermined amount; variable rate coding means having a variable coding rate for coding multiplexed data outputted by said multiplexing means; data modulating means for modulating coded data outputted by said variable rate coding means to produce modulated data as transmit data; and coding rate control means for, based on a result of detection outputted by said data amount detecting means, changing a coding rate of said variable rate coding means and transmitting information associated with a change of coding rate by setting the information in the coded data; said receive terminal equipment comprising: data demodulating means for demodulating the transmit data received to produce coded data; variable rate decoding means having a variable decoding rate for decoding the coded data outputted by said data demodulating means to produce multiplex data; data demultiplexing means for separating the transmit data from the multiplex data outputted by said variable rate decoding means; and decoding rate control means for separating the information associated with a change of coding rate from the coded data to change a decoding rate of said variable rate decoding means.
Claim 2
Dependent Claim
235 words
In a satellite communication system with a variable coding rate comprising transmit terminal equipment a receive terminal equipment, said transmit terminal equipment comprising: data multiplexing means for multiplexing transmit data applied over a plurality of channels; data amount detecting means for determining whether or not an amount of the transmit data is greater than a predetermined amount; variable rate coding means having a variable coding rate for coding multiplexed data outputted by said multiplexing means; data modulating means for modulating coded data outputted by said variable rate coding means to produce modulated data as transmit data; and coding rate control means for, based on a result of detection outputted by said data amount detecting means, changing a coding rate of said variable rate coding means and transmitting information associated with a change of coding rate by setting the information in the coded data; said receive terminal equipment comprising: data demodulating means for demodulating the transmit data received to produce coded data; variable rate decoding means having a variable decoding rate for decoding the coded data outputted by said data demodulating means to produce multiplex data; data demultiplexing means for separating the transmit data from the multiplex data outputted by said variable rate decoding means; and decoding rate control means for separating the information associated with a change of coding rate from the coded data to change a decoding rate of said variable rate decoding means.
Claim 3
Dependent Claim
32 words
A system as claimed in claim 1, wherein said variable rate coding means of said transmit terminal equipment comprises coders having coding rates of 1/2, 3/4 and 7/8, respectively, and a selector.
Claim 4
Dependent Claim
21 words
A system as claimed in claim 2, wherein said coding rate control means comprises a CPU and a parallel input/output port.
Claim 5
Independent Claim
36 words
A system as claimed in any of claims 1 to 3, wherein said variable rate decoding means of said receive terminal equipment comprises decoders having decoding rates of 1/2, 3/4 and 7/8, respectively, and a selector.
Claim 6
Dependent Claim
21 words
A system as claimd in claim 4, wherein said decoding rate control means comprises a CPU and a parallel input/output port.
References Cited (Backward Citations)
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