Dynamic slot allocation (DSA) in indoor SDMA/TDMA using smart antenna basestation
IEEE/ACM Transactions on Networking (TON)
Power allocation and routing in multibeam satellites with time-varying channels
IEEE/ACM Transactions on Networking (TON)
Wireless Communications
Performance of space-division multiple-access (SDMA) with scheduling
IEEE Transactions on Wireless Communications
Space-time transmit precoding with imperfect feedback
IEEE Transactions on Information Theory
Smart antennas for broadband wireless access networks
IEEE Communications Magazine
Beyond 3G: wideband wireless data access based on OFDM and dynamic packet assignment
IEEE Communications Magazine
Efficient use of side information in multiple-antenna data transmission over fading channels
IEEE Journal on Selected Areas in Communications
Transmit beamforming and power control for cellular wireless systems
IEEE Journal on Selected Areas in Communications
Multiuser OFDM with adaptive subcarrier, bit, and power allocation
IEEE Journal on Selected Areas in Communications
Empirical capacity of mmWave WLANs
IEEE Journal on Selected Areas in Communications - Special issue on realizing GBPS wireless personal area networks
mmWave SVD-based beamformed MIMO communication systems
CCNC'10 Proceedings of the 7th IEEE conference on Consumer communications and networking conference
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Beamforming with adaptive antenna arrays is the most promising means for increasing data rates of wireless systems, since it enables channel reuse by several users in a cell through space division multiple access (SDMA). In SDMA, multiple beams are formed towards different users, each beam by a dedicated transceiver. However, the use of adaptive antenna arrays at the physical layer mandates significant modifications for higher layers. Joint consideration of beamforming and higher layer issues is required in order to fully exploit the benefits of SDMA. Moreover, adoption of the popular orthogonal frequency division multiplexing (OFDM) technique creates additional challenges when the number of beams that can be formed at the transmitter is bounded. This issue is attributed to transceiver resource limitations and gives rise to a coupled resource allocation problem, that of assigning transceiver hardware units and OFDM subcarriers for transmission to users. Different users can be served either with the same beam from a transceiver and different subcarriers or with different beams and the same subcarriers. We characterize the problem and propose meaningful heuristic algorithms for beamforming and assignment of subcarriers and transceivers to users. The objective is to increase achievable system rate and ensure QoS in the form of minimum rate guarantees. The criteria for resource assignment and beam formation are based on spatial separability properties of users, beam vector cross-correlations and induced interference. Numerical results quantify the performance benefits of these cross-layer techniques and provide useful insights and design guidelines for realistic systems.