A multiuser transmitted reference UWB transceiver for high data rate communication

Abstract

A conventional transmitted reference (TR) transceiver suffers from a data rate penalty and performance loss in the presence of the typically severe multipath distortion. It is also ineffective in suppressing multiuser interference (MUI). Thus a multiuser TR (MTR) UWB transceiver is designed for high data rate communication in this work. A doublet is transmitted in each frame. The first pulse is a reference pulse, but the second pulse carries two bits of user information in amplitude and position simultaneously using bi-orthogonal signaling. Such a hybrid modulation doubles data rate. Since no restrictive constraint is imposed on pulse spacing, data rate can be further increased to four times that of the conventional TR transceiver as pulse spacing approaches zero. To improve resilience to MUI, each pulse is amplitude modulated by a pseudo-random (PN) sequence. Moreover, a time hopping sequence can be applied to control the delay of each data pulse. At the receiver, the signal waveform can be reliably estimated from the noisy received signal despite severe inter-pulse interference and MUI. Then two templates are constructed for simple correlation detection that independently detects both bits, while complicated joint detection is unnecessary