Telecommunication network for transmitting information to a plurality of stations over a single channel
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United States of America Patent
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Mar 18, 1997
Issued Date -
N/A
app pub date -
May 30, 1995
filing date -
Nov 19, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a multiple access network a main station is to be capable of distinguishing signals transmitted by sub-stations to the main station. A method of realising this is the use of SCMA (SubCarder Multiple Access). According to this method the signal to be transmitted is modulated on a subcarrier having its own frequency and then modulated on a main carrier in each sub-station. In prior-art multiple access network the distribution signals which are to be transmitted to the sub-stations by the main station are modulated each on its own distribution subcarrier and then applied to a shared distribution modulator. For diminishing the requirements posed on the high-frequency properties of the electronic components necessary for the network, the subcarriers for distribution signals and return signals are selected to lie in the same frequency band.
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