Satish Vedantam

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— Algorithms for the estimation of a channel whose impulse response is characterized by a large number of zero tap coefficients are developed and compared. Estimation is conducted in a two-stage fashion where an estimate of the non-zero taps is followed by channel estimation. Tap detection is transformed into an equivalent on-off keying detection problem.(More)
A scenario involving a source, a channel, and a destination, where the destination is interested in both reliably reconstructing the message transmitted by the source and estimating with a fidelity criterion the state of the channel, is considered. The source knows the channel statistics but is oblivious to the actual channel state realization. Herein, it(More)
A joint communication and channel state estimation problem is investigated, in which reliable information transmission over a noisy channel, and high-fidelity estimation of the channel state, are simultaneously sought. The tradeoff between the achievable information rate and the estimation distortion is quantified by formulating the problem as a constrained(More)
A joint sensing/communication problem is considered for sensor networks. Herein, the channel(s) between a source and destination are the parameters to be sensed and communicated over the network. Lower bounds on the end-to-end distortion are developed for a multihop, linear network. Internode communication is assumed to be done via an encode-and-forward(More)
A new class of abstract sensor networks is introduced and analyzed. The object of the sensing is the inter-node channel. Examples of systems which seek to sense the channel include: underwater sonar, radar and optics based atmospheric sensor networks. In these networks, the sensing and communication tasks share the bandwidth resource in addition to the(More)
Fig. 1. Setup for testing and benchmarking the NAMOS system. of anchored buoys (the static nodes), and a robotic boat (the mobile robot) capable of measuring temperature and chlorophyll concentrations. Thus, the testbed is a collection of static nodes as well as mobile/actuated nodes. A key research goal of the NAMOS project is determining how to coordinate(More)
A formulation for a joint communication and estimation problem is proposed: simultaneous communication over a noisy channel and estimation of certain channel parameters are desired. We are interested in quantifying the tradeoff between the achievable rate and distortion in estimating the channel parameters. Two particular sample channels are considered and(More)
The problem of time-varying channel estimation in multihop sensor networks is examined. Two relay processing methods are explored: amplify-and-forward and encode-and-forward. Bounds on the end-to-end distortion for all internode channel estimates are computed for these two relay processing schemes. Performance is analyzed via the asymptotic limit of the(More)
The problem of communicating over a two hop network while estimating the channel states to within a distortion constraint is explored. The end to end capacity of this network is upper and lower bounded. Under certain conditions, it is shown that the upper and lower bounds match and we have the capacity of the network. An example is also presented to apply(More)
• Communication under random and uncertain environments • Cognitive radios • Multiuser communications systems • Communication and networking issues in underwater acoustic systems • Information theory • Internet traffic analysis using signal processing techniques