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Mathematical theory of communication (Recent development of various method…
Mathematical theory of communication
Recent development of various method of modulations
Like PCM or PPM which exchange bandwidth to signal to noice ratio
Papers of Nyquist and Hartley are biased towards this theory
Fundamental problem of communication
Reproducing message as is or approximately at any given time
Semantic aspect of message (Message have meaning )
this is however irrelevant to engineering problem
Significant aspect : selection of s message from probable options
A system must be designed to operate for each possible selection
Most Natural choice
Logarithmic function
It is close to our intuitive feeling
Since we intuitively measure entities by linear comparison with common standards
Practically more useful
parameters such as time, bandwidth, number of relays etc. tend to vary linearly with log of number of possibilities
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It is mathematically more suitable
Choice of log base corresponds to choice of units for measuring
Eg if base 2 is used the resulting unit ill be binary or bits
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Communication system
means system of type indicated schematically
produces a message or sequence of message to be communicates to the receiving terminal
It operates on producing some signal suitable for transmission
Medium used to transmit the signal
performs the inverse operation - reconstruct the message from signal
The person or object for whom the signal is intended
eg: pair of wires or coaxial cable etc.
eg : in telegraph an encoding operation produces sequence of dots and dashes and space
Intrest in MTC intensified
Pointed out
by Hartley
Convenient because of following reasons
5 parts of communication system
Information source
A Transmitter
Channel
Receiver
Destination
Noice