Improved AMC using adaptive SIR thresholds in OFDM based wireless systems

Abstract

Adaptive modulation with coding (AMC) is often employed to enhance the throughput of OFDM based wireless systems. The AMC mode is usually adjusted according to the signal to interference ratio (SIR) of the received signal. Most of conventional schemes use fixed thresholds for the selection of AMC mode, yielding a large performance variation depending on the channel characteristics. This paper proposes the use of adaptive SIR thresholds for the mode selection in response to the channel condition, providing significant improvement in throughput performance in a wide range of channel environments.