How data rate depends upon Frequency

[moonnightingale]

Hi friends i was reading book of satellite communication in which it was written that the each subscriber is allocated 50 KHz for data rate of 64 kbit/sec and 100 Khz for data rate of 128 Kbit/sec out of total bandwidth of 40 MHZ of each transponder of Satellite.
Can u kindly tell me what is relationship of Data rate with frequency. how can we calculate the relationship among two. Bye

[Tomi Engdahl]

The maximum data rate that can be transported in the given communications channel is related to the available bandwidth and the available signal to noise ratio. Those define the theoretical maximum capacity. The real life communications modulation and other related techniques can transport the amount of data that is always less than the theoreticla maximum. Some get more near to the theoreticial maximum, some just give performance that is just a small fraction of the theoretical maximum.

The available data rate is pretty much directly propertional to the available bandwidth when the other properties on the system (modulation technique and signal-to-noise ratio) stay the same.

[edwinc]

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