A SIMPLE APPROACH TO OFDM-BASED SYSTEMS DYNAMIC OPTIMIZATION

Morena Minto - Diego Ragazzi - Luigi Agarossi - Luca Giangaspero

   Link adaptation techniques have recently emerged as a powerful tool to perform radio interface optimization, a key feature of future mobile/wireless systems allowing to dynamically find the best trade-off among high throughput, QoS and low power. In this framework a reduced-complexity algorithm for fast, joint optimization of OFDM indoor wireless systems operating in frequency selective environments, is proposed. Based on the sub-carrier switching concept and the channel state information, the algorithm dynamically selects the transmission parameters, as far as modulation and channel coding are concerned, that guarantee the required QoS (bit rate and BER) with the minimum transmission power. The algorithm is handled by a "Supervisor" unit, which is the unit responsible for real-time information processing and control in any adaptive and/or re-configurable transceiver.

Keywords: radio interface optimization, mobile/wireless systems

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