Polar Modulation Based Reduction of Communications Energy Consumption
Analysis of the energy consumed by the mobile communication infrastructure shows that it draws gigawatts of power. Further analysis of the individual components drawing this power shows that the largest consumption occurs in the infrastructure (base station) power amplifier (PA), along with its associated radio transceiver (XCVR) and digital signal processing (DSP). Meaningful reduction of this power draw therefore requires achieving significant reduction in this power drawn in each base station, though with the further requirement that network service levels are not degraded. This forces recognition that the important metric for base station output signal quality is its modulation accuracy, independent from whether the circuitry implementing that signal is linear or not. This work shows that suppressing transmitter circuit linearity by using switching circuit techniques is successful at maintaining output signal accuracy while improving transmitter operating efficiency for LTE base stations from near 12% to more than 40%.