Design of an Adaptive Frequency Hopping Algorithm Based On Probabilistic Channel Usage

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Hellbrück, Horst Ben Cheikh, Sami 2012-07-02T08:42:40Z 2012-07-02T08:42:40Z 2011
dc.description.abstract Dealing with interference in the 2.4 GHz ISM band is of paramount importance due to an increase in the number of operating devices. For instance systems based on Bluetooth low energy technology are gaining lots of momentum due to their small size, reasonable cost and very low power consumptions. Thus the 2.4 GHz ISM band is becoming very hostile. Bluetooth specification enables the use of adaptive frequency hopping to improve performance in the presence of interference. This technique avoids the congested portions of the ISM band, however as the number of interferers increases for a given geographical environment, a greater number of bad channels are removed from the adapted hopping sequence. This results in longer channel occupancy, and consequently higher probability of collisions with coexisting devices, degrading their operation. At CoSa Research Group a novel algorithm, based on probabilistic channel usage of all channels (good and bad), is developed. The scheme is named Smooth Adaptive Frequency Hopping (SAFH) and uses an exponential smoothing filter to predict the conditions of the radio spectrum. Based on the predicted values, different usage probabilities are assigned to the channels, such as good channels are used more often than bad ones. The discrete probability distribution generated is then mapped to a set of frequencies, used for hopping. MATLAB/SIMULINK was used to investigate the performance of SAFH, in the presence of different types of interfering devices such as 802.11b , 802.15.4 and 802.15.1. Simulation study under different scenarios show, that our developed algorithm outperforms the conventional random frequency hopping as well as other adaptive hopping schemes. SAFH achieves lower average frame error rate and responds fast to changes in the channel conditions. Moreover it experiences smooth operation due to the exponential smoothing filter. en
dc.format.extent [8] + 71
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.title Design of an Adaptive Frequency Hopping Algorithm Based On Probabilistic Channel Usage en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.department Tietoliikenne- ja tietoverkkotekniikan laitos fi
dc.subject.keyword adaptive frequency hopping en
dc.subject.keyword coexistence in the ISM band en
dc.subject.keyword probabilistic channel usage en
dc.subject.keyword interference mitigation en
dc.subject.keyword exponential smoothing filter en
dc.subject.keyword WPAN en
dc.subject.keyword LR-WPAN en
dc.subject.keyword WLAN en
dc.identifier.urn URN:NBN:fi:aalto-201207022743
dc.type.dcmitype text en
dc.programme.major Tietoliikennetekniikka fi
dc.programme.mcode S-72
dc.type.ontasot Diplomityö fi
dc.type.ontasot Master's thesis en
dc.contributor.supervisor Jäntti, Riku
dc.location P1 fi

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