Bit and power allocation for goodput optimization in coded OFDM systems

We focus on resource allocation in a coded orthogonal frequency division multiplexing system. A frame-oriented transmission with convolutional coding and Viterbi decoding is considered. We suppose that only error-free frames are kept by the receiver, other frames are thrown away and have to be retransmitted. As a consequence, the only meaningful criterion for evaluating the performance of such a system is the error-free rate, or goodput. This criterion is a good compromise between the rate and bit error probability criterions. We here present a formulation for the goodput of the system and propose a bit and power allocation algorithm maximizing it. The proposed algorithm is then compared with other existing resource allocation strategies. Simulation results show that the proposed algorithm significantly improves the performance.