UNIT V ERROR CONTROL CODING: CONVOLUTION CODES

To obtain the transfer function of a convolutional code, the splitting of all-zero state takes place into ___

A. starting state
B. first return to all-zero state
C. in-between state

• A & B
  

• B & C

• A & C

• None of the above

What is not the advantages of digital communications?

• Ability to recover lost information through error correction

• Immunity to noise ( ability to function in the presence of noise)

• Added security with data encryption and decryption

• Ability to transmit signal below the noise level all the time

What are the three different types of multiplexing?

• TDMA, FDMA, CDMA

• TDAM, FDMA, SDMA

• TDD, FDMA, CDMA

• FDD, TDD, TDMA

What FEC (Forward Error Correction Code) is used in the Digital Communication System for mobile radio communication?

• Parity-Check

• Convolution Codes and Trellis Diagram

• Reed Solomon

• Combination of Convolution Codes, Trellis and Reed Solomon Codes

What coding technique is used to help to protect against burst errors?

• Convolution Codes

• Vertibi

• Interleaving

• Reed Solomon Codes

What is the disadvantages of interleaving?

• It adds extra bits to the data

• It adds delay to the system

• It adds noise to the data

• It adds error to the system

Which decoding method involves the evaluation by means of Fano Algorithm?

• Maximum Likelihood Decoding
  

• Sequential Decoding
  

• Both a and b
  

• None of the above

 The code in convolution coding is generated using

• EX-OR logic

• AND logic

• OR logic

• None of the above

Interleaving process permits a burst of B bits, with l as consecutive code bits and t errors when

• B ≤ 2tl

• B ≥ tl

• B ≤ tl/2

• B ≤ tl

For a (7, 4) block code, 7 is the total number of bits and 4 is the number of

• Information bits

• Redundant bits

• Total bits- information bits

• None of the above