Ultra Wide Band technology has attracted a lot of attention recently as a viable solution for high data rate, low power, short-range wireless link. The growing multi-media home networking is demanding more bandwidth and wireless throughput has become a bottleneck for high quality multi-media services. With the maximum data rate above 100 Mbps, UWB is a perfect solution for such applications.This paper describe such a system that takes advantage of the high data rate offered by UWB. We first implemented the complete MB-OFDM PHY layer using multi-FPGA hardware and discrete RF design. Out implementation is fully compliant to the WiMedia/MBOA PHY specifications and the FCC power regulations. The system achieved 110Mbps maximum data rate with a BER better than 10-6 over a range of 4 meters.Subsequently, we developed a testbed that demonstrates simultaneous transmission of multiple High Definition video streams over the MB-OFDM link. The use-case scenario is a Multimedia Client-Server application where we have one Media Server (transmitter) and several Media Players (receivers). IEEE Consumer Communications and NetworkingThis work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved.

Acoustic communication in air has attracted attention as an alternative near-field communication medium. A parametric loudspeaker has the potential to achieve acoustic communication within a personal area. However, secondary nonlinear components of communication signals generated by self-demodulation in air become barriers to acoustic communication. Although the use of orthogonal frequency division multiplexing (OFDM) would be desirable, since it achieves low-calculation-cost equalization at the receiver even in a multipath fading environment, inter-carrier interference (ICI) with secondary components degrades communication quality. In this paper, we propose an efficient subcarrier arrangement for OFDM communication using parametric loudspeakers. We consider two subcarrier arrangements: odd-comb OFDM and narrow-band OFMD. The former has an active subcarrier at odd indexes, and the latter has a restricted frequency band to avoid ICI. We also test the proposed schemes in experiments. The experimental results suggest that the proposed OFDM successfully improves communication quality compared to the original OFDM.

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