The spatial domain information of the propagation is extremely important to take into account the antenna systems in the wireless broadband systems. This paper describes the concept and the modeling of the double-directional spatio-temporal channel for wideband and ultra-wideband wireless systems. The research activities toward the establishment of the channel model in Tokyo Tech are also descr...

We consider a multiple-input, multiple-output (MIMO) wideband Rayleigh block fading channel, where the channel state is unknown to both the transmitter and the receiver. With only an average power constraint, we compute the capacity of this channel and consider it’s interaction with the coherence length, number of transmit and receive antennas and receive signal-to-noise ratio (SNR) per degree ...