Detection And Opportunistic Spectrum Access In Sensor Networks

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Title: Detection And Opportunistic Spectrum Access In Sensor Networks
Author: Ly, Hung Dinh
Abstract: This thesis examines target detection problems in Radar Sensor Networks (RSN ) and opportunistic spectrum access problem in Cognitive Sensor Networks (CSN ) . First , studies on the Space -Time Adaptive Processing (STAP ) and radar waveform design are provided . Investigation into the target detection performance gain of RSN when STAP and radar waveform design are combined in RSN is then performed . Studies in this thesis show that detection performance of RSN using our proposal is superior to that of a single radar system using STAP only . To further studies on target detection , the multi -target detection problem in RSN is also examined . Signal , interference , and noise at radar sensors are modeled and analyzed . At the clusterhead of RSN , a Maximum Likelihood Multi -Target Detection algorithm is proposed to estimate the possible number of targets in a surveillance area . Achieved results show that detection performance of RSN is much better than that of a single radar system in terms of the miss -detection probability and the root mean square error . Besides detection in RSN , this thesis studies an opportunistic spectrum access problem and proposes a spectrum access scheme in CSN . The spectrum access scheme is built using Fuzzy Logic System (FLS ) ; and spectrum access decision is based on : (1 ) spectrum utilization efficiency of the secondary user (SU ) ; (2 ) its degree of mobility ; and (3 ) its average distance to primary users (PU ) . The output of the FLS provides the probabilities of accessing spectrum band for SUs and the SU with the highest probability will be assigned the available spectrum . Studies also show that our scheme performs much better than random access approach .
URI: http : / /hdl .handle .net /10106 /573
Date: 2007-09-17

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Detection And Opportunistic Spectrum Access In Sensor Networks. Available electronically from http : / /hdl .handle .net /10106 /573 .

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