Consider an OFDM approach that employs 8 subcarriers (which is admittedly too small to be all that useful): (a) For a set of symbols given in vector s, what is a simple matrix-vector form for the transmit sequence in time denoted by column vector x? De ne any terms clearly. (b) What is the transmitted time-domain sequence for s = (1; 0; 0; 0; 0; 0; 0; 0)T ? (c) What is the transmitted time-domain sequence for s = (1; 1; 0; 0; 0; 0; 0; 0)T ?