Mark A Beach

TL;DR: In this paper, a multiple-beam adaptive base station antenna is proposed as a major system component in an attempt to solve the problem of meeting the proliferating demands for mobile telephony within the confinement of the limited radio spectrum allocated to these services.

TL;DR: A previously proposed Kronecker-structure-based narrow-band model for nonline-of-sight (NLoS) indoor multiple-input-multiple-output (MIMO) radio channels based on 5.2-GHz indoor MIMO channel measurements is verified and it is shown that the MIMo channel covariance matrix can be well approximated by the Kr onecker product of the covariance matrices.

TL;DR: A new statistical wideband indoor channel model which incorporates both the clustering of multipath components (MPCs) and the correlation between the spatial and temporal domains is proposed and the model validity is confirmed by comparison with two existing models reported in the literature.

TL;DR: It is shown that for NLOS indoor scenarios, the MIMO channel covariance matrix can be well approximated by a Kronecker product of the covariance matrices describing the correlation at the transmitter and receiver side respectively.

TL;DR: Division-free duplex is proposed for future wireless systems, thus providing simultaneous duplex radio transmission on a division-free basis, and results from an experimental RF system yielding some 72 dB duplex isolation at 1.8 GHz for 200 kHz channelisation.