Sundar Subramanian

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— Geographic forwarding has been widely studied as a routing strategy for large wireless networks, mainly due to the low complexity of the routing algorithm, scalability of the routing information with network size and fast convergence times of routes. On a planar network with no holes, Gupta and Kumar (2000) have shown that a uniform traffic demand of is(More)
—We consider the problem of throughput-optimal routing over large-scale wireless ad-hoc networks. Gupta and Kumar (2000) showed that a throughput capacity (a uniform rate over all source-destination pairs) of Θ(1 √ n log n) is achievable in random planar networks, and the capacity is achieved by straight-line routes. In reality, both the network model and(More)
Geographic routing with greedy relaying strategies have been widely studied as a routing scheme in sensor networks. These schemes assume that the nodes have perfect information about the location of the destination. When the distance between the source and destination is normalized to unity, the asymptotic routing delays in these schemes are(More)
Flooding based querying and broadcasting schemes have low hop-delays of &#920; (1/<i>R</i>(<i>n</i>) to reach any node that is a unit distance away, where <i>R</i>(<i>n</i>) is the transmission range of any sensor node. However, in sensor networks with large radio ranges, flooding based broadcasting schemes cause many redundant transmissions leading to a(More)
Millimeter-wave (mmW) multi-input multi-output (MIMO) systems have gained increasing traction towards the goal of meeting the high data-rate requirements for next-generation wireless systems. The focus of this work is on low-complexity beamforming approaches for initial user equipment (UE) discovery in such systems. Towards this goal, we first note the(More)
The focus of this paper is on beamforming in a millimeter-wave (mmW) multi-input multi-output (MIMO) setup that has gained increasing traction in meeting the high data-rate requirements of next-generation wireless systems. For a given MIMO channel matrix, the optimality of beamforming with the dominant right-singular vector (RSV) at the transmit end and(More)