We consider the network sum rate maximization in the downlink of a cellular system based on the spatial channel model of the 3GPP MIMO urban macro cell with multiple antenna base stations and single antenna mobile devices. We formulate an upper bound to the kind of cooperation, where each mobile device is served by only one base station, but base stations try to control the interference they pr...

This paper presents a novel fully integrated passive transponder IC with 4.5or 9.25-m reading distance at 500-mW ERP or 4-W EIRP base-station transmit power, respectively, operating in the 868/915-MHz ISM band with an antenna gain less than 0.5 dB. Apart from the printed antenna, there are no external components. The IC is implemented in a 0.5m digital two-poly two-metal digital CMOS technology...

|A model is proposed herein to simulate wideband correlated diversity channel from the point of view of the base station. It is assumed that scattering activity is limited to a local area around the subscriber and possibly additional secondary scattering areas, each being of local extent. Simulation is possible by generating correlated random variates obeying a complex gaussian law to represent...

A directional wideband measurement campaign was performed in urban macrocells at 2 GHz using a channel sounder and a 8-sensor linear antenna array at the base station. Directions of arrival at the Base Station (BS) were estimated by beamforming using the antenna array. Directions of arrival at the Mobile Station (MS) were estimated by beamforming using parts of the measurement route. Global par...

The main task in designing of any wireless communication system is to predict the coverage of the planned system using some mathematical path loss models before the original design of the system. Propagation path loss models are very much useful mathematical tools to calculate signal attenuation and it can be used as a controlling factor for the system performance and coverage. The propagation ...

The advances in programmable and reconfigurable radios have rendered feasible transmitter optimization schemes that can greatly improve the performance of multiple antenna multiuser systems. Reconfigurable radio platforms are particularly suitable for implementation of transmitter optimization at the base station. We consider the downlink of a wireless system with multiple transmit antennas at ...

Hybrid beamforming via large antenna arrays has shown a great potential for increasing data rate in cellular networks by delivering multiple data streams simultaneously. In this paper, several beamforming design algorithms are proposed based on the long-term channel information for macro-cellular environments where the base station is equipped with a massive phased array under per-antenna power...

The challenge to in-band full-duplex wireless communication is managing self-interference. Many designs have employed spatial isolation mechanisms, such as shielding or multi-antenna beamforming, to isolate the self-interference wave from the receiver. Such spatial isolation methods are effective, but by confining the transmit and receive signals to a subset of the available space, the full spa...

In mobile communication systems with multisensor antennas at base stations, downlink channel estimation plays a key role because accurate channel estimates are needed for transmit beamforming. One efficient approach to this problem is channel probing with feedback. In this method, the base station array transmits probing (training) signals. The channel is then estimated from feedback reports pr...

In the current wireless, cellular systems, each mobile station (MS) independently communicates with a base station (BS). In this article we investigate collaboration among MSs where an MS retransmits a signal from the BS to a nearby MS that is in a shadowing or deep fading region relative to the BS. We develop a formula for the outage probability of a non-collaborative system with two transmit ...