Goodput optimized bit and power allocation for OFDM transmission with relaying

This paper considers point to point transmission over frequency selective channels by means of OFDM (orthogonal frequency division multiplexing), and enhanced by means of a decode-and-forward (DAF) relay. Assuming that perfect channel state information is available at the transmission side, this paper intends to solve the problems of power and bit allocation for goodput maximization. A greedy approach is proposed where the number of bits to be allocated is increased one at a time till a maximum value of the goodput is reached. The performance of the algorithm is illustrated with simulations, and compared with uniform power allocation and waterfilling approaches.