Multiuser performance of M-ary orthogonal coded/balanced UWB transmitted-reference systems
IEEE Transactions on Communications
Monobit digital eigen-based receiver for transmitted-reference UWB communications
IEEE Transactions on Wireless Communications
Optimum receiver design for transmitted-reference signaling
IEEE Transactions on Communications
M-ary PPM for transmitted reference ultra-wideband communications
IEEE Transactions on Communications
Performance study of a high-rate multiuser transmitted reference ultra-wideband transceiver
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
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A conventional transmitted reference (TR) modulation scheme is an effective means to combat severe multipath distortion in an ultra-wideband (UWB) system, significantly relaxing the equalization requirements. However, it suffers from multiple-access interference and a data rate loss. In this paper, we propose a multiuser TR scheme to extend TR modulation to the multiuser case, while almost doubling the data rate by allowing arbitrarily small spacing of pulse pairs. The proposed scheme assigns a pair of pseudorandom sequences to each user to enable multiple access, modulating the amplitude of data and reference pulses, respectively. A waveform template is first estimated, followed by data demodulation. A time-hopping code can be employed to further minimize the effect of signal collisions. The method is appropriate for both pulse amplitude modulation and pulse position modulation. Waveform estimation and bit-error rate analysis are provided, and confirmed with simulations. Substantial detection improvements over conventional TR detectors are observed.