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Various products and patents have been established with regard to telescopic mechanisms over a long period of time. However, to the best of our knowledge, with reference to motional characteristics, few studies have been reported on a telescopic mechanism that is capable of bidirectional extension. Moreover, as we wish to point out here, such a kind of(More)
In this paper, a low complexity subcarrier allocation scheme is proposed for multiuser MIMO-multiuser OFDM systems with zero-forcing beamforming (ZFBF) to minimize the total transmit power satisfying given target data rates of users. The ZFBF for multiuser MIMO makes multiple spatial channels by removing multiuser interference and the subcarrier allocation(More)
The UWB (ultra-wideband) communication system occupies very large bandwidth of 7.5 GHz. This enables high-precision ranging that provides correct position information. In this paper, we analyzed each of high-order-phase chirps from 2nd-order to 4th-order for DS (direct-sequence)-UWB ranging and investigated to find out the optimal phase based on the(More)
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