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In the past decade, there has been a huge proliferation of wireless local area networks (WLANs) based on the IEEE 802.11 WLAN standard. As 802.11 connectivity becomes more ubiquitous, multihop communications will be increasingly used for access point range extension and coverage enhancement. In this paper, we present a design for an IEEE 802. 11 -based(More)
In this paper we consider a set of portable stations which communicate with a basestation equipped with a smart antenna operating in multibeam packet-switched SDMA mode. We assume that the system operates using time division du-plexing (TDD) and focus on the problem of access to the stations by the basestation in the forward link direction. A polling(More)
IEEE 802.11 WLANs are increasingly used to support real-time services such as voice and video. Reliable portable operation, however, is often difficult due to factors such as imperfect customer access point (AP) installation, unpredictable WLAN coverage, and unexpected co-channel interferers. In this paper we propose and investigate the use of IEEE 802.11(More)
todd@mcmaster.ca Abstract— In this paper we consider the capacity of a set of portable stations sharing a single indoor radio channel. The stations communicate with a basestation which is equipped with a smart antenna operating in multibeam SDMA/TDMA mode. Both theoretical models and measured data from an experimental testbed are presented. The experimental(More)
In this paper we consider vertical handoff for dualmode (DM) cellular/WLAN handsets. When the handset roams out of WLAN coverage, the DM’s cellular interface is used to maintain the call by anchoring it through a PSTN gateway/PBX . Soft handoff can be achieved in this case if the gateway supports basic conference bridging, since a new leg of the call can be(More)
Parasitic antennas are much lower in cost and complexity than conventional smart antennas. For this reason, they may be considered for use at the portable station. In this paper we study the capacity of a spacedivision-multiple-access (SDMA) system when n element switched parasitic antenna arrays (SPAA) are used for this purpose. As in [1], dynamic slot(More)