A New Bi-Allocation Scheme for Uplink OFDMA Wireless System Using Compound Symbols for the Detection Process

In this paper, we propose a new heuristic for a Bi-Allocation uplink problem when using OFDMA multiuser wireless systems. This is done by assuming a new detection scheme of “two” or fewer incoming signals from different users to each receiving detector subcarrier of the base station which is based on product trellises. A gain of 13.56% in (bits/s/Hz) is achieved in capacity bandwith channel by the proposed heuristic compared with non-polynomial solvers. On the other hand, under the new detection scheme, there’s a gain of 1.5 dB’s achieved for a BER of less than 10 when sending double the number of bits over a MIMO Rayleigh fading channel. Key-Words: Optimization, Wireless Networks, Adaptive Modulation, OFDMA, Trellis Structure.