Error Detection

Construct the odd parity for: 1 1 0 1 0 0 1

Construct the odd parity for: 1 1 1 1 1 0 1

Construct the odd parity for: 1 0 1 0 0 1 0

A sender needs to send the message: 101101 using the divisor: x^3 + x^2 + 1. What is the CRC?

For the same example (with the message of 101101). What would be the total code-word created at the Tx?

Answer explanation

The code created at the Tx in polynomial form is ...

• x^8 + x^5 + x^3 + x^2 + x

• x^8 + x^6 + x^5 + x^3 + x

• x^8 + x^6 + x^5 + x^3

• x^8 + x^6 + x^5 + x^3 + x +1

If the following stream of bits are received: 0110100, 1011011 and 0100011 What is the checksum?

Answer explanation