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In order to accurately evaluate spatial processing techniques such as MIMO for wideband mobile communications, a Time-Spatial Propagation (TSP) model that can simulate, at the same time, the characteristics of both the delay profile and the spatial arrival angular profile for travelling waves is required. We proposed the TSP model for wideband mobile communication systems using UHF and SHF bands in...
This paper presents a new spectrum sensing scheme using an energy detector and multiple antennas. This scheme helps us finding the low level signals to realize a spectrum sharing in a primary and secondary system. The spectrum sensing by using multiple antennas has a problem that the channel state information of the primary signal is required for obtaining the diversity gain. However, the primary...
This paper considers a transmit beamforming and subcarrier power allocation method for orthogonal frequency division multiple access (OFDMA) systems. As the beamforming vector control criterion, we employ the maximization of so-called signal-to-leakage-plus-noise ratio (SLNR) at each base station, which enable us to obtain closed form beamforming vector by using only locally available information...
Mobile terminals used in a stationary condition receives a level variation different from that in a moving condition. Therefore, it is very important to study the fading characteristics in this environment. This paper clarifies experimentally the fading characteristics of mobile terminals in outdoor NLOS environments when they are used in a stationary condition and objects in its surroundings such...
In this paper, we propose a novel multi-antenna utilization scheme for avoiding the packet congestion around the gateway (GW) of the ad-hoc wireless networks. In our previous work, we have discussed the number of antenna design for suitable for packet congestion around the GW. However, only multi-user access with multi-antenna is considered at the receiver node. Moreover, we do not consider the effective...
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