Diversity Techniques for Interference Mitigation between IEEE 802.11 WLANs and Bluetooth

Premkumar, K.; Srinivasan, Suganya

doi:10.1109/pimrc.2005.1651688

Cited by 7 publications

(1 citation statement)

References 2 publications

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“…Interference-rejection techniques can increase cellular capacity by mitigating both co-channel and adjacent channel interference in cellular systems. Moreover, interference-rejection techniques can also reduce the cross-interference among different wireless systems that share the same frequency (i.e., wireless local area networks and wireless personal area networks) and improve their performance [13], [14]. Furthermore, interference-rejection techniques can help to facilitate compatibility during transitions between the old and new communication technologies.…”

Section: Motivationmentioning

confidence: 99%

Interference suppression for fast frequency-hopped communication systems over fading channels

Zhang¹

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In this thesis, we consider interference suppression for fast frequency-hopped (FFH) communication systems over fading channels. Three types of interference, namely, partial-band noise jamming (PBNJ), multitone jamming (MTJ) and multiple-access interference (MAI), are of interest. To suppress the effect of PBNJ, we propose a maximum-likelihood (ML) receiver for frequency-selective Rayleigh-fading channels and derive the corresponding analytical bit-error rate (BER) expressions. We then focus on a more general frequency-selective Rician-fading channel, in which an optimum ML receiver structure is proposed. In addition, two suboptimum ML receivers and their corresponding analytical BER expressions are presented. Furthermore, the linear-combining and product-combining receivers are also investigated under the same channel conditions. To mitigate the composite effect of MTJ and PBNJ, we present analytical BER expressions for an ML receiver under frequency non-selective Rayleigh-fading channel conditions. Following that, frequency-selective Rayleigh-fading channels are considered. System performance of the linear-combining, product-combining and ML receivers is studied and compared. We then investigate the effects of timing and frequency offsets on system performance under frequency non-selective Ricianfading channel conditions. Numerical results show that the FFH system is very sensitive to the timing and frequency offsets. vii ATTENTION: The Singapore Copyright Act applies to the use of this document. Nanyang Technological University Library Lastly, we focus on the suppression of MAI. An optimum ML receiver and two suboptimum ML receivers, namely, the ML-A and ML-B receivers, are proposed for synchronous systems over frequency non-selective Rician-fading channels. Analytical BER expressions of these two proposed suboptimum ML receivers are presented. In addition, we study the system performance of the linear-combining, product-combining and clipper receivers, and compare their BER performance with the proposed optimum and two suboptimum ML receivers. Performance comparisons show that the proposed optimum ML receiver has the best BER performance,

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Section: Motivationmentioning

confidence: 99%