In-Cell Frequency Reuse for Broadband Indoor Wireless Systems Using Sectored Antennas

Authors:
Aleandro S. Macedo;Elvino S. Sousa
Affiliations:
Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada {macedo,sousa}@comm.toronto.edu;Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada {macedo,sousa}@comm.toronto.edu
Venue:
Wireless Personal Communications: An International Journal
Year:
1999

Citing 3
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A multiple access scheme for wireless access to a broadband ATM LAN based on polling and sectored antennas

IEEE Journal on Selected Areas in Communications

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Abstract

This paper proposes a hybrid Space-Time Division Multiple Access (S-TDMA) for broadband indoor wireless systems using sectored antennas. It is shown that portables which are located in different sectors of the indoor microcell may be able to reuse the same frequency and the same time slot. However this requires careful scheduling of packet transmissions in order to avoid transmitting packets that would jam each other during the same time slot. It is proposed that the scheduling be performed by the base station, i.e., a central control architecture. If the number of channels (simultaneous transmissions) is larger than two, the optimum scheduling algorithm, the one that maximizes the number of packets transmitted per frame, is in the NP-Complete class of problems and so can not be solved in real time. Therefore a sub-optimum algorithm named the First Fit Algorithm (FFA) is proposed for frame scheduling and its performance is investigated through measurement results obtained in some typical indoor environments. Computer simulations based on the measured data showed that the FFA can provide a large capacity gain. For example, for a minimum acceptable signal-to-interference ratio of 10 dB and for a sectorization level ten (using ten sectors in the base station) the FFA can multiply the capacity by 3.6 in a typical open indoor location. This means that on average, 3.6 packets can be transmitted per time slot while using the same radio frequency.