D

B log2 (1 + S/N) Where D& = Data rate in noisy channel (in bps) B = Bandwidth of the channel S/N = Signal to noise ratio.

For S/N of 30 dB and 3 kHz Bandwidth noisy channel, D& is 30000 bps.

Relation between baud rate (or symbol rate) and bps : The baud rate and bit rate are related as

where n = number of bits required to represent signal levels.

In the example considered for baud rate explanation n is assumed as one. Hence baud rate is equal to bps. Fig. 11.2 illustrates the relation between baud and bit rates.

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