Olivier Sentieys

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A wireless body area sensor network (WBASN) demands ultra low power and energy efficient protocols. Medium access control (MAC) layer plays a pivotal role for energy management in WBASN. Moreover, idle listening is the dominant energy waste in most of the MAC protocols. WBASN exhibits wide range of traffic variations based on different physiological data(More)
The minimization of cost, power consumption and time-to-market of DSP applications requires the developmentof methodologies for the automatic implementation offloating-point algorithms in fixed-point architectures. Inthis paper, a new methodology for evaluating the qualityof an implementation through the automatic determinationof the Signal to Quantization(More)
One of the most important stages of floating-point to fixed-point conversion, is the evaluation of the fixed-point specification accuracy. This evaluation is required to optimize the data word-length according to accuracy constraints. Classical methods for accuracy evaluation are based on fixed-point simulations but they lead to very long optimization(More)
An energy-efficient platform for wireless sensor networks and its dedicated software framework are described and optimizations are proposed at both hardware and software level. The hardware is based on low cost and low power components linked in a multilayer architecture. Some processing, such as error correcting codes, are accelerated by a low power FPGA(More)
Energy efficiency and transmission delay are very important parameters for wireless multihop networks. Numerous works that study energy efficiency and delay are based on the assumption of reliable links. However, the unreliability of channels is inevitable in wireless multihop networks. In addition, most of works focus on self-organization protocol design(More)
Digital signal processing applications are specified with floating-point data types but they are usually implemented in embedded systems with fixed-point arithmetic to minimise cost and power consumption. Thus, methodologies which establish automatically the fixed-point specification are required to reduce the application time-to-market. In this paper, a(More)
In wireless distributed networks, cooperative relay and cooperative multiple-input-multiple-output (MIMO) techniques can be used to exploit the spatial and temporal diversity gains to increase the performance or reduce the transmission energy consumption. The energy efficiency of cooperative MIMO and relay techniques is then very useful for the(More)
In addition to the high performance requirements inherent to multimedia processings or to W-CDMA, future generation mobile telecommunications brings new constraints to the semiconductor design world. In fact, to support these processings, a system will have to be very flexible, in order to support the various algorithms allowed by the norm and the addition(More)
Recent advances in energy harvesting (EH) technologies now allow wireless sensor networks (WSNs) to extend their lifetime by scavenging the energy available in their environment. While simulation is the most widely used method to design and evaluate network protocols for WSNs, existing network simulators are not adapted to the simulation of EH-WSNs and most(More)