How to find proability of error in digital commumication?
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What is Probability error in digital communication?
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Charan Langton, Author of book:
Answered Nov 28, 2017 · Author has 127answers and 89.3k answer views
This is complex topic and a simple answer is not possible. What you have is a signal that is being corrupted by some sort of random process. Despite being called random process, these processes can be quantified by their Probability Density Function (pdf), such as Gaussian, Uniform, Rayleigh etc. Depending on the medium through which a signal travels, it is attacked by these random process, akin to adding a random signal to the one transmitted. Now the bit that was of say amplitude V may be changed to either V+ or V-. This may or may not cause an error at the receiver. This depends on the way the bit is mapped to symbols, a process called modulation and the pdf of the random process.
The BER of a signal is a function of the medium it is traveling through, the bit to symbol mapping, coding used and a few other parameters such as the signal power.
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2 ANSWERS

Charan Langton, Author of book:
Answered Nov 28, 2017 · Author has 127answers and 89.3k answer views
This is complex topic and a simple answer is not possible. What you have is a signal that is being corrupted by some sort of random process. Despite being called random process, these processes can be quantified by their Probability Density Function (pdf), such as Gaussian, Uniform, Rayleigh etc. Depending on the medium through which a signal travels, it is attacked by these random process, akin to adding a random signal to the one transmitted. Now the bit that was of say amplitude V may be changed to either V+ or V-. This may or may not cause an error at the receiver. This depends on the way the bit is mapped to symbols, a process called modulation and the pdf of the random process.
The BER of a signal is a function of the medium it is traveling through, the bit to symbol mapping, coding used and a few other parameters such as the signal power.
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