# What is Bit Error Rate ?

When data is transmitted to its destination over a communication channel there is a possibility of errors being introduced into the the data. In digital communication performance of the system is assessed by a term called as bit error rate, BER. BER is also known by the term Probability of Error.

In simple words, it is actually the ratio of number of bits in error to the total number of bits transmitted.

**BER = Bits in Error/Total Number of Bit transmitted**

For instance, If 10 bits were transmitted, and 5 bits get in error,then :

BER=5/10

=0.2

In BER curve if a value is mentioned, say 0.01, it means ,out of 100 transmitted bits, 1 bit got error [1/100=0.01]

**Example:**

Let's consider an example, assume a transmitted bit sequence:

0 1 1 0 0 0 1 0 1 1

and the following received bit sequence:

0

__0__1 0__1__0 1 0__0__1,The number of bit errors (the underlined bits) is in this case 3. The BER is 3 incorrect bits divided by 10 transmittedbits, resulting in a BER of 0.3 or 30%.

Posted by Sadaf Dilshad Khan
on 22:13. Filed under
Bit Error Rate,
Communication Basics,
Digital Communication System
.
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