Lab 2 COMMUNICATION TECHNOLOGY II. Capacity of a System The bit rate of a system increases with an increase in the number of signal levels we use to denote.

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Lab 2 COMMUNICATION TECHNOLOGY II

Capacity of a System The bit rate of a system increases with an increase in the number of signal levels we use to denote a symbol. A symbol can consist of a single bit or “n” bits. The number of signal levels = 2 n. As the number of levels goes up, the spacing between level decreases -> increasing the probability of an error occurring in the presence of transmission impairments.

Nyquist Theorem Nyquist gives the upper bound for the bit rate of a transmission system by calculating the bit rate directly from the number of bits in a symbol (or signal levels) and the bandwidth of the system (assuming 2 symbols/per cycle and first harmonic). Nyquist theorem states that for a noiseless channel: C = 2 B log 2 2 n C= capacity in bps B = bandwidth in Hz

Consider a noiseless channel with a bandwidth of 3000 Hz transmitting a signal with two signal levels. The maximum bit rate can be calculated as

We need to send 265 kbps over a noiseless channel with a bandwidth of 20 kHz. How many signal levels do we need? Solution We can use the Nyquist formula as shown: Since this result is not a power of 2, we need to either increase the number of levels or reduce the bit rate. If we have 128 levels, the bit rate is 280 kbps. If we have 64 levels, the bit rate is 240 kbps.

Shannon’s Theorem Shannon’s theorem gives the capacity of a system in the presence of noise. C = B log 2 (1 + SNR)

We can calculate the theoretical highest bit rate of a regular telephone line. A telephone line normally has a bandwidth of The signal-to-noise ratio is usually For this channel the capacity is calculated as This means that the highest bit rate for a telephone line is kbps. If we want to send data faster than this, we can either increase the bandwidth of the line or improve the signal-to-noise ratio.

Suppose that the voice frequency of 400 Hz is transmitted using transmitter operating at 800 MHZ a)The Carrier Frequency b)The Baseband Frequency c)The modulating Frequency

What's the Channel Capacity for teleprinter channel with 300-Hz and signal to noise ratio of 3 db?