Toshihiko Wakahara

New 60 GHz high-speed wide campus network

A high-speed wireless network has been constructed that utilizes the newly approved 60 GHz frequency band. In Japan, this newly allocated millimeter wave can be used without a license. The system configuration and the experimental results are shown. The prototype system has been constructed at the Waseda University campus and the operation of this system is confirmed. Then the transmission characteristics in the experiments show very good and this system can provide the remote lecture service and seminar, etc.

Millimeter-wave over fiber systems using hybrid OCDM/WDM transmission

In this paper, we propose and simulate 2 OCDM × 4 WDM transmission system for a millimeter-wave (60 GHz) over fiber system to be used in broadband wireless access networks (BWANs). The general system setup is devised and the necessary building blocks identified. Results gathered (for a 155 Mbit/s per user system) under worst case parameter specifications and settings suggest indicate that system performance is severely limited by optical multiuser interference (OMUI) penalties. Several methods to reduce the OMUI limitations are described. These methods should ensure that this transmission scheme possible wavelength-reuse option for future MMW BWANs.