A hybrid time-hopping / frequency-hopping / pulse-shape-hopping ultra wideband multiple-access technique

Abstract

Impulse radio (IR), single-band or multiband, ultra wideband (UWB) systems use simple and low-power-consuming transceivers. Such systems may use low duty cycle time-hopping (TH), leading to low data-rate transmission. Efforts on data rate increase in single-band TH-UWB systems have led to proposal of modulation techniques combining conventional methods and orthogonal pulse shape based schemes. Pulsed multiband systems add abilities for coexistence with narrowband users and frequency-hopping to the IR UWB benefits. This work-in-progress paper proposes use of pulsed multiband approach with combined orthogonal pulse position and bi-orthogonal pulse shape modulation (OPPM-BPSM). A symbol is transmitted at a pseudo-random time-slot on a pseudo-random frequency band using a pseudo-random set of pulse orders in a frame, and the symbol is repeated over a number of frames in a hopping period. A hybrid time-hopping / frequency-hopping / pulse-shape-hopping (TH/FH/PSH) multiple-access technique is, thus, proposed. The system can increase data rate through OPPM-BPSM. Analysis shows the system to increase user capacity and to be robust under multiple-access interference in additive white Gaussian noise (AWGN) channels.