Madhavan Vajapeyam

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Data traffic demand in cellular networks today is increasing at an exponential rate. As the link efficiency is approaching its fundamental limits, further improvements in system spectral efficiency are only possible by increasing the node deployment density. In a relatively sparse deployment of macro base stations, adding another base station does not(More)
In resource limited, large scale underwater sensor networks, cooperative communication over multiple hops offers opportunities to save power. Intermediate nodes between source and destination act as cooperative relays. Herein, protocols coupled with space-time block code (STBC) strategies are proposed and analyzed for distributed cooperative communication.(More)
  • Jordan Melzer, Daniel Tsur Pasher, +22 authors Mayumi Thrasher
  • 2006
Error-control coding is a key feature of most modern communications systems, allowing close to a factor of ten in increased receiver sensitivity. Here we explore two aspects of low-cost error-control code decoders. First we design single decoders that provide competitive performance-complexity trade-offs over a wide range of operation. We introduce a new(More)
The broad connection of devices to the Internet, known as the IoT or M2M, requires lowcost power-efficient global connectivity services. New physical layer solutions, MAC procedures, and network architectures are needed to evolve the current LTE cellular systems to meet the demands of IoT services. Several steps have been taken under the 3GPP to accomplish(More)
In resource limited, large scale underwater sensor networks, cooperative communication over multiple hops offers opportunities to save power. Intermediate nodes between source and destination act as cooperative relays. Herein, protocols coupled with space–time block code (STBC) strategies are proposed and analyzed for distributed cooperative communication.(More)
The United States Federal Communications Commission allows for the transmission of ultra-wideband (UWB) signals in the frequency range from 3.1-10.6 GHz, enabling the overlay of such signals over existing narrowband signals. To reduce interference to the existing signals, strict power limitations are imposed. Envisioned UWB applications include:(More)
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