41,682 research outputs found
Energy efficiency of error correction on wireless systems
Since high error rates are inevitable to the wireless environment, energy-efficient error-control is an important issue for mobile computing systems. We have studied the energy efficiency of two different error correction mechanisms and have measured the efficiency of an implementation in software. We show that it is not sufficient to concentrate on the energy efficiency of error control mechanisms only, but the required extra energy consumed by the wireless interface should be incorporated as well. A model is presented that can be used to determine an energy-efficient error correction scheme of a minimal system consisting of a general purpose processor and a wireless interface. As an example we have determined these error correction parameters on two systems with a WaveLAN interfac
Hardware/Software Co-design Applied to Reed-Solomon Decoding for the DMB Standard
This paper addresses the implementation of Reed-
Solomon decoding for battery-powered wireless
devices. The scope of this paper is constrained by the
Digital Media Broadcasting (DMB). The most critical
element of the Reed-Solomon algorithm is implemented
on two different reconfigurable hardware
architectures: an FPGA and a coarse-grained
architecture: the Montium, The remaining parts are
executed on an ARM processor. The results of this
research show that a co-design of the ARM together
with an FPGA or a Montium leads to a substantial
decrease in energy consumption. The energy
consumption of syndrome calculation of the Reed-
Solomon decoding algorithm is estimated for an FPGA
and a Montium by means of simulations. The Montium
proves to be more efficient
Performance analysis of a hybrid ARQ system in half duplex transmission at 2400 BPS
Hybrid ARQ/FEC protocols have been proposed to provide high data link integrities whilst keeping at the same time a high mean throughput rate. Nevertheless, hybrid ARQ strategies offer a lot of choices and none of them can be considered the optimum in any case. Three alternative protocol strategies using BCH codes are evaluated and the HF channel models used for the tests are discussed.Peer ReviewedPostprint (published version
Havens: Explicit Reliable Memory Regions for HPC Applications
Supporting error resilience in future exascale-class supercomputing systems
is a critical challenge. Due to transistor scaling trends and increasing memory
density, scientific simulations are expected to experience more interruptions
caused by transient errors in the system memory. Existing hardware-based
detection and recovery techniques will be inadequate to manage the presence of
high memory fault rates.
In this paper we propose a partial memory protection scheme based on
region-based memory management. We define the concept of regions called havens
that provide fault protection for program objects. We provide reliability for
the regions through a software-based parity protection mechanism. Our approach
enables critical program objects to be placed in these havens. The fault
coverage provided by our approach is application agnostic, unlike
algorithm-based fault tolerance techniques.Comment: 2016 IEEE High Performance Extreme Computing Conference (HPEC '16),
September 2016, Waltham, MA, US
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