Adaptive Resource Allocation with Strict Delay Constraints in OFDMA System

Harsh wireless channel conditions, scarce bandwidth, and limited power resources require intelligent allocation schemes which can efficiently exploit channel variations. OFDMA is a multi-carrier modulation and multiplexing technique which divides the wide-band frequency selective wireless channel into a set of orthogonal narrow-band channels and provides immunity from Inter-Symbol Interference (ISI). In a multi-user system, different sub-carriers can be allocated to different users without interference. Due to the multi-carrier nature of OFDMA systems, enormous opportunities exist for dynamic sub-carrier and power allocation strategies.