Sundaram Vanka

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We design and implement a software-radio system for Superposition Coding (SC), a multiuser transmission scheme that deliberately introduces interference among user signals at the transmitter, using a library of off-the-shelf point-to-point channel codes. We experimentally determine the set of ratepairs achieved by this transmission scheme under a(More)
We study the convergence of the average consensus algorithm in wireless networks in the presence of interference. For regular lattices with periodic boundary conditions, we characterize the convergence properties of optimal MAC protocol that maximizes the speed of convergence on these networks. We provide analytical upper and lower bounds for the(More)
We analyze the effect of interference on the convergence rate of average consensus algorithms, which iteratively compute the measurement average by message passing among nodes. It is usually assumed that these algorithms converge faster with a greater exchange of information (i.e., by increased network connectivity) in every iteration. However, when(More)
We propose and experimentally demonstrate a novel approach to improve the packet delivery efficiency on a vulnerable downlink (e.g., from a transmitter to a far-away receiver) using superposition coding, a multiuser transmission scheme that forgoes orthogonal transmission and deliberately introduces interference among signals at the transmitter. On a(More)
Superposition coding is a well-known capacityachieving coding scheme for stochastically degraded broadcast channels. Although well-studied in theory, it is important to understand issues that arise when implementing this scheme in a practical setting. In this paper, we present a software-radio based design of a superposition coding system on the GNU Radio(More)
Network-wide adoption of a multipacket transmission scheme such as Superposition Coding (SC) for local “one-to-many” communication results in mutually interfering “broadcast” clusters. We analyze the benefits of SC and traditional Frequency Division (FD) with this interference via a utility function that measures the rate of(More)
We design and implement a software-radio system for rapid on-off-division duplex (RODD), a scheme to achieve virtual full-duplex communication at the level of a transmission frame. RODD is based on the insight that it is not necessary to separate a node’s transmission and reception at the timescale of a frame. Instead, RODD allows each node in a network to(More)