Opportunistic media access for multirate ad hoc networks
Proceedings of the 8th annual international conference on Mobile computing and networking
Optimization of Efficiency and Energy Consumption in p-Persistent CSMA-Based Wireless LANs
IEEE Transactions on Mobile Computing
ISPAN '00 Proceedings of the 2000 International Symposium on Parallel Architectures, Algorithms and Networks
Proceedings of the 5th ACM international symposium on Mobile ad hoc networking and computing
Routing in multi-radio, multi-hop wireless mesh networks
Proceedings of the 10th annual international conference on Mobile computing and networking
Proceedings of the 10th annual international conference on Mobile computing and networking
Exploiting medium access diversity in rate adaptive wireless LANs
Proceedings of the 10th annual international conference on Mobile computing and networking
A Multi-Radio Unification Protocol for IEEE 802.11 Wireless Networks
BROADNETS '04 Proceedings of the First International Conference on Broadband Networks
MOAR: A Multi-Channel Opportunistic Auto-Rate Media Access Protocol for Ad Hoc Networks
BROADNETS '04 Proceedings of the First International Conference on Broadband Networks
Capacity of multi-channel wireless networks: impact of number of channels and interfaces
Proceedings of the 11th annual international conference on Mobile computing and networking
Fundamentals of wireless communication
Fundamentals of wireless communication
OMAR: Utilizing Multiuser Diversity in Wireless Ad Hoc Networks
IEEE Transactions on Mobile Computing
Enhancing downlink performance in wireless networks by simultaneous multiple packet transmission
IPDPS'06 Proceedings of the 20th international conference on Parallel and distributed processing
Transceiver optimization for multiuser MIMO systems
IEEE Transactions on Signal Processing
Diversity and multiplexing: a fundamental tradeoff in multiple-antenna channels
IEEE Transactions on Information Theory
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Opportunistic medium access (i.e., multiuser diversity) and MIMO techniques (i.e., multiple-antenna techniques) are two effective ways to achieve a substantial throughput gain in a multiuser wireless system. In this paper, we propose a medium access control (MAC) protocol with opportunistic medium access and multiuser MIMO techniques (MAC-OMA/MM) in Multi-channel Multi-radio Wireless Local Area Networks (WLANs) to explore the utility of the joint design of these two techniques for the challenging MAC design. Specifically, in addition to utilizing multiple channels simultaneously and assigning multiple radio transceivers dynamically, multiuser MIMO technique is applied on each frequency channel to enhance the data rates. The key ideas of MAC-OMA/MM can be summarized as follows. By utilizing ATIM (Ad-hoc Traffic Indication Message) windows as in IEEE 802.11 power saving mechanism (PSM), user selection and channel negotiation are conducted between the access point (AP) and multiple users via ATIM messages on a common channel. Multiuser diversity are employed to opportunistically schedule among multiple candidate users to optimize data transmission in each negotiation. During data exchange, on each frequency channel, the AP is capable to communicate with two distinct users simultaneously both for the downlink and uplink data transmissions with the help of multiuser MIMO technique, which creates an extra dimension in spatial domain to further leverage the effect of multiuser diversity and multi-channel gains. Another contribution of this paper is to provide an analytical model to characterize the impact of our protocol on the system throughput and energy efficiency performance. Extensive simulations have been conducted and the results demonstrate that our protocol outperforms existing multi-channel MAC protocols with only minimal additional overhead and minor enhancements to the IEEE 802.11 PSM.