Reduction of power envelope fluctuations in ECMA-368 ultra wideband communication system

摘要

ECMA-368 is a recent standard, describing the UWB physical layer (PHY-UWB) for wireless personal area network (WPAN) by using the Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) approach. However, the large power envelope fluctuations of MB-OFDM UWB signal, limits the power efficiency of the High Power Amplifier (HPA) due to nonlinear distortion. In this paper, we will use the Active Constellation Extension Approximate Gradient-Project technique (ACE-AGP) to reduce the power envelope fluctuations in real ECMA-368 system, the efficiency of ACE-AGP is compared with partial transmit sequences (PTS) algorithm. Simulation results show that the reduction of CM by ACE-AGP is better (5dB) than PTS (3dB) and with less complexity, also the BER achieved by both methods does not undergo a significant degradation.