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LTE handset RF power consumption emulation

Abstract:

This paper presents a new methodology for the emulation of power consumption of the RF portion of a cell phone/ handset when transmitting a LTE signal. The inputs to the emulation are baseband-RF subsystem logical interface parameters such as bandwidth, carrier frequency, TX power. The dissipated power is measured at discrete values of the variables, and the emulated power is obtained by a 4 × 5 × 1 neural network applying Pseudo-Gauss-Newton optimization algorithm. The methodology has been validated to have an accuracy of 94.3% though this is constrained by the measurement uncertainty of 11%. A FTP upload scenario in motion is used to illustrate the emulation methodology. A homotopy mapping method described in this paper is able to model the power consumption of the RF subsystem of a handset operating at a carrier frequency of 1.95 GHz with a 10 MHz signal bandwidth, from measured data at 1.4 and 20 MHz signal bandwidths with an error of only 1%.