How Do XM and Sirius Satellite Radios Broadcast Multiple Stations?

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XM and Sirius Satellite Radios utilize approximately 12 MHz of bandwidth to transmit a 7.5 Mbps digital stream, enabling them to broadcast over 100 audio channels simultaneously. Unlike traditional analog FM radio, which operates on single frequencies, satellite radio employs advanced microwave satellite digital data transmission technology. Each audio channel is encoded at varying bit rates to ensure sound quality meets listener expectations. This innovative approach allows for efficient use of bandwidth and a diverse range of programming options. Understanding this technology clarifies how satellite radio can deliver multiple stations without the limitations of conventional broadcasting methods.
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this may be kind of dumb question but...

How do XM and Sirius broadcast so many stations? Isn't evey broadcaster given one frequency.
 
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The technology used for microwave satellite digital data transmission is quite a bit different from that used for plain old analog FM radio.

Both satellite radio systems (XM and Sirius) actually use approximately 12 MHz of bandwidth to transmit a 7.5 Mbps digital stream. The entire stream, comprising 100+ channels of audio, is recovered by every receiver. The different audio chnanels are encoded at different bit rates, depending up the fidelity necessary for acceptable sound reproduction.

http://www.elecdesign.com/Articles/Print.cfm?AD=1&ArticleID=5603

- Warren
 
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