On the performance of ad hoc networks with beamforming antennas
MobiHoc '01 Proceedings of the 2nd ACM international symposium on Mobile ad hoc networking & computing
Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
An adaptive strategy for maximizing throughput in MAC layer wireless multicast
Proceedings of the 5th ACM international symposium on Mobile ad hoc networking and computing
Fundamentals of WiMAX: Understanding Broadband Wireless Networking (Prentice Hall Communications Engineering and Emerging Technologies Series)
Antenna Theory: Analysis and Design
Antenna Theory: Analysis and Design
MobiSteer: using steerable beam directional antenna for vehicular network access
Proceedings of the 5th international conference on Mobile systems, applications and services
Experimental characterization of sectorized antennas in dense 802.11 wireless mesh networks
Proceedings of the tenth ACM international symposium on Mobile ad hoc networking and computing
Interference alignment and cancellation
Proceedings of the ACM SIGCOMM 2009 conference on Data communication
DIRC: increasing indoor wireless capacity using directional antennas
Proceedings of the ACM SIGCOMM 2009 conference on Data communication
LTE, The UMTS Long Term Evolution: From Theory to Practice
LTE, The UMTS Long Term Evolution: From Theory to Practice
SAM: enabling practical spatial multiple access in wireless LAN
Proceedings of the 15th annual international conference on Mobile computing and networking
Optimal beam scheduling for multicasting in wireless networks
Proceedings of the 15th annual international conference on Mobile computing and networking
On the effectiveness of switched beam antennas in indoor environments
PAM'08 Proceedings of the 9th international conference on Passive and active network measurement
Design and experimental evaluation of multi-user beamforming in wireless LANs
Proceedings of the sixteenth annual international conference on Mobile computing and networking
Beamforming in MISO systems: empirical results and EVM-based analysis
IEEE Transactions on Wireless Communications
IEEE/ACM Transactions on Networking (TON)
Transmit beamforming for physical-layer multicasting
IEEE Transactions on Signal Processing - Part I
MIMO-assisted MPR-aware MAC design for asynchronous WLANs
IEEE/ACM Transactions on Networking (TON)
Link layer multicasting with smart antennas: No client left behind
ICNP '08 Proceedings of the 2008 IEEE International Conference on Network Protocols
DirCast: A practical and efficient Wi-Fi multicast system
ICNP '09 Proceedings of the 2009 17th IEEE International Conference on Network Protocols. ICNP 2009
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We present the design and implementation of ADAM, the first adaptive beamforming-based multicast system and experimental framework for indoor wireless environments. ADAM addresses the joint problem of adaptive beamformer design at the PHY layer and client scheduling at the MAC layer by proposing efficient algorithms that are amenable to practical implementation. ADAM is implemented on a field programmable gate array (FPGA) platform, and its performance is compared against that of omnidirectional and switched beamforming based multicast. Our experimental results reveal that: 1) switched multicast beamforming has limited gains in indoor multipath environments, whose deficiencies can be effectively overcome by ADAM to yield an average gain of threefold; 2) the higher the dynamic range of the discrete transmission rates employed by the MAC hardware, the higher the gains in ADAM's performance, yielding up to ninefold improvement over omni with the 802.11 rate table; and 3) finally, ADAM's performance is susceptible to channel variations due to user mobility and infrequent channel information feedback. However, we show that training ADAM's signal-to-noise ratio (SNR)-rate mapping to incorporate feedback rate and coherence time significantly increases its robustness to channel dynamics.