An Energy-Efficient Weighting Strategy for Various TRPC-UWB Communication Systems

Compared with the conventional transmitted reference (TR) signalling in noncoherent ultrawideband (UWB) communications, a TR pulse cluster (TRPC) signalling structure not only provides better performance but avoids long wideband delay line issues of TR as well. The TRPC has been widely studied and most of the related works with improved performance are based on original TRPC (o-TRPC) and improved TRPC (i-TRPC) schemes. However, there is an unavoidable energy loss in the autocorrelation receiving process for the o-TRPC and i-TRPC communications systems. As energy efficiency has been becoming increasingly crucial in real-world applications, based on the o-TRPC/i-TRPC schemes, this article introduces an energy-efficient weighting strategy, which can optimize their transmitting power allocation. To enable the weighting strategy to adapt instantly to different TRPC signalling structures, a new algorithm of determining the optimal value of weighting parameters is designed and based on which an adaptive power allocation mechanism is devised at the transmitter side. Our semi-analytical and simulation results validate the effectiveness of the proposed method in terms of energy efficiency. In the scenarios of IEEE 802.15.3a channel model, by using the designed weighting strategy, up to 1.4dB and 2.5dB of power saving can be further achieved for o-TRPC and i-TRPC schemes, respectively.