An energy-efficient OFDM ultra-wideband digital radio architecture

Abstract

We propose an energy efficient architecture, utilizing peak-to-average power ratio (PAR) information in both transmitter and receiver side. It is identified that the energy consumption of digital-to-analog (D/A) and analog-to-digital (A/D) conversion is the most critical bottleneck in realizing energy efficient digital radios with high data rate. Therefore, our transmitter reduces requantization noise in D/A conversion by digital OFDM symbol up-scaling before D/A conversion and analog OFDM symbol inverse-scaling after D/A conversion. Our receiver reduces quantization noise in A/D conversion by fine tracking automatic gain control (AGC) for each OFDM symbol, after coarse AGC is performed. The proposed architecture reduces a power consumption of D/A and A/D conversion by up to 24% while providing the same performance as the conventional one.