Home | | **Analog and Digital Communication** | Quadrature Phase Shift Keying (QPSK) Techniques and its Block Diagram

Advantages of QPSK
· Very good noise immunity
· Effective utilization of available bandwidth
· Low error probability

__QUADRATURE PHASE SHIFT KEYING (QPSK) TECHNIQUES AND
ITS BLOCK DIAGRAM____:__

__Advantages of QPSK__

·
Very good noise immunity

·
Effective utilization of available
bandwidth

·
Low error probability

Very high bit rate data
transmission

This
is Synchronous reception. Therefore coherent carrier is to be recovered from
the received signal s(t).

**Compare binary PSK with
QPSK.**

BPSK QPSK

1. One
bit forms a symbol. Two bits form a symbol.

2. Two
possible symbols. Four possible symbols.

3. Minimum
bandwidth is twice of fb. Minimum bandwidth is equal to fb.

4. Symbol
duration = Tb. Symbol duration = 2Tb.

9. What are the
advantages of M-ary signaling scheme?

1. M-ary
signaling schemes transmit bits at a time.

2. Bandwidth
requirement of M-ary signaling schemes is reduced.

The probability of
error in M-Ary FSK as the value of m increases:

As
the value of „M‟ increases, the Euclidean distance between the symbols reduces.
Hence the symbols come closer to each other. This increases the probability of
error in M-ary systems.

Correlative coding allows the signaling rate of 2B0 in the channel of bandwidth B0. This is made physically possible by allowing ISI in the transmitted signal in controlled manner. This ISI is known to the receiver. Hence effects of ISI are eliminated at the receiver. Correlative coding is implemented by duobinary signaling and modified duobinary signaling.

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Analog and Digital Communication : Quadrature Phase Shift Keying (QPSK) Techniques and its Block Diagram |

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