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This paper proposes a capacity optimizing power loading scheme for spatially constrained antenna arrays. The proposed power loading scheme is designed mainly for MIMO systems that are operating over channels with narrow angular spread values. The design problem is approached from a physical wave field perspective, in particular using a modal expansion for free space wave propagation. When a signal...
Next generation systems are using directional antennas for indoor high data rate devices. This arises a need for measurement and modelling of directional channels. Indoor environments also introduce extreme multipath behaviour into the directional channel. Directional measurements raise the problem of complicated data sets with 2-D spatio-temporal information. In order to analyse these complex data...
In this paper we measure and characterize 55-65 GHz wireless channels for a typical desktop environment. An angle of arrival (AoA) modified Saleh-Valenzuela (S-V) model is used for the desktop environment. Key AoA modified S-V model parameters such as cluster decay factor, ray decay factor, cluster arrival rate, ray arrival rate and AoA ray angular standard deviation are extracted from the measured...
This paper investigates the capacity of discrete time uncorrelated Rayleigh fading multiple input multiple output (MIMO) channels with no channel state information (CSI) at both the transmitter and the receiver. We prove that to achieve the capacity, the amplitude of the multiple input needs to have a discrete distribution with a finite number of mass points with one of them located at the origin...
The mutual information of a discrete time Rayleigh fading channel is considered, where neither the transmitter nor the receiver has knowledge of the channel state information (CSI). We show the mutual information of uncorrelated multiple input multiple output (MIMO) Rayleigh fading channels in closed form when the input distribution is complex Gaussian for any transmit and receive antenna configuration...
The mutual information of a discrete time Rayleigh fading channel is considered, where neither the transmitter nor the receiver has the knowledge of the channel state information. We specifically derive a lower bound for the mutual information of this channel when the input distribution is Gaussian. The bound is expressed in terms of the capacity of the corresponding non fading channel and the capacity...
Limits of information transfer over a discrete time uncorrelated Rayleigh fading MIMO channel is considered, where neither the transmitter nor the receiver has the knowledge of the channel state information (CSI) except the fading statistics. We show the capacity supremum with the receive antenna number at any SNR using Lagrange optimisation. Furthermore, we show the asymptotic capacity when the input...
It has been shown that the effects of multipath propagation in a mobile wireless communications system can be mitigated if the receiver can make predictions about the multipath fading. In this paper, we introduce a novel scheme for extrapolating multipath fields outwards in space, given field observations within a limited region. Whereas previous work has concentrated on simple multipath propagation...
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