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doubt in bandwidth and data rate

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chandra999777

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hey guys can u help me in understanding how data rate increases with bandwidth. plz explain me with the below details

bandwidth=20MHZ
modulation=qpsk
 
QPSK has 4 discrete points so there are two bits per symbol. The bandwidth of a QPSK signal will be dependent on shaping of symbols. You want to get the most energy per bit but keep the bandwidth to a minimum. This is a trade off.

If you shape the symbols through a root raised filter you will get close to 40 Mbits per second for QPSK within a 20 MHz bandwidth.
 
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