QoS-aware power minimization for OFDM-based radio systems

The requirement for high-performance, flexible, QoS-aware, low-power digital transceivers is one of the key challenges for future mobile/wireless systems. Within this framework, a reduced-complexity algorithm for fast, joint optimization of the transmission parameters in OFDM indoor wireless systems is proposed. The algorithm, based on the subcarrier switching concept, is handled by the "supervisor" unit that is the basic processing and control unit of any adaptive and reconfigurable system, meant to perform, in real-time, a predefined system optimization. The proposed algorithm dynamically determines the modulation and channel coding parameters for an OFDM-based system operating in frequency selective environments. Based on the channel state information, the algorithm selects the transmission parameters that guarantee the required QoS (bit rate and BER) with the minimum transmission power.