Question

4. Using CRC, given the dataword 11110000 and the divisor 10011

a. Show the generation of the codeword at the sender site

b. Show the checking of the codeword at the receiver site

5. Given the bit pattern 101110001, encode the stream using BFSK and QPSK.

a) *CRC Codeword Generation:*
- Sender: Dataword XOR Divisor = Codeword
- (11110000 ,XOR , 10011 = 1111000011000 ) (Codeword)

b) *CRC Codeword Checking:*
- Receiver: Received Codeword XOR Divisor = Remainder
- If Remainder = 0, no error; otherwise, there is an error.

c) *BFSK Encoding:*
- Transmit a high-frequency signal for one bit and a low-frequency signal for another bit.

d) *QPSK Encoding:*
- Quadrature Phase Shift Keying involves encoding two bits per symbol by varying the phase of the carrier signal.

Answer 1

This answer explains CRC codeword generation and checking, BFSK encoding, and QPSK encoding.

Step-by-step explanation:

CRC Codeword Generation:

Sender: Dataword XOR Divisor = Codeword - (11110000 XOR 10011 = 1111000011000) (Codeword)

CRC Codeword Checking:

Receiver: Received Codeword XOR Divisor = Remainder - If Remainder = 0, no error; otherwise, there is an error.

BFSK Encoding:

Transmit a high-frequency signal for one bit and a low-frequency signal for another bit.

QPSK Encoding:

Quadrature Phase Shift Keying involves encoding two bits per symbol by varying the phase of the carrier signal.