Q1. (a) Show using an example, that two-dimensional (i.e. horizontal and longitudinal) block check parity schemes can detect all 3-bit errors in a block 5 Marks] of data. (b) A (14,7) Hamming codeword is sent over a channel with a bit error rate of 5 x 102. Calculate the probability of 4 or more errors occurring in any codeword [4 Marks] (c) Stations are allowed to transmit onto a shared radio channel whenever they like (i.e. pure Aloha is
OR
OR