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IMPULSIVE NOISE MODELING AND COEXISTENCE STUDY OF
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This thesis describes the interference problem between IEEE 802.11 and Bluetooth. These well established communication standards are often used together simultaneously. Since both standards operate in the ISM-band at 2.45 GHz, they interfere with each other. In addition to this, interference from e.g. microwave ovens, heating processes, electric motors and cordless phones also occurs on the ISM-band. Due to this interference problem, a model has been developed in MATLAB to further investigate these interferences and the effects for the user. The interference is modelled using the well known Class-A model for impulsive noise. The interference model is parameterized in the model and therefore the noise source(s) is described by a set of parameters derived from real measurements. Models for IEEE 802.11 legacy/b and Bluetooth are based on work published on the user community of MATHWORKS. To get a measure of performance, results from the model are presented as BER (Bit Erro
gha2014nim 0 0
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OFDM transmission is a new combined pulse noise mi
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Abstract - orthogonal frequency division multiplexing (OFDM) can use two threshold clipping and zeroing schemes to alleviate the impact of noise. We introduce a new combined impulse noise cancellation method, called clipping replacement return to zero scheme, in which three thresholds are considered: clipping threshold tclip, replacing threshold TREP and return to zero threshold tnull. When the amplitude of the received OFDM sample is higher than TREP and tnull, we set it to the average amplitude JX? Noise free OFDM sample J. Simulation results show that additional actions, replacement actions, and TREP are a good choice to bring about a reduction in bit error rate.
gha2014nim 2 0
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