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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Wang, Kezhi
Languages: English
Types: Doctoral thesis
Subjects: TK

Classified by OpenAIRE into

ACM Ref: ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS
arxiv: Computer Science::Information Theory
Cooperative relaying has been proposed as a promising solution to mitigate and combat the deleterious effects of fading by sending and receiving independent copies of the same signal at different nodes. It has attracted huge attention from both industry and academia. The purpose of this thesis is to provide an analytical performance evaluation of the cooperative wireless systems while taking some realistic conditions into consideration. To achieve this, first, performance analysis of amplify-and-forward (AF) relaying using pilot-aided maximum likelihood estimation is studied in this thesis. Both disintegrated channel estimation (DCE) and cascaded channel estimation (CCE) are considered. Based on this analysis, optimal energy allocation is proposed.\ud \ud Then, performance analysis for AF relaying corrupted by interferers are investigated. Both randomly distributed and fixed interferers are considered. For random interferers, both the number and the locations of the interferers are random while for fixed interferers, both the number and the locations are fixed.\ud \ud Next, multihop relaying and multiple scattering channels over α - μ fading are analyzed. Channels with interferences and without interferences are considered. Exact results in the form of one-dimensional integral are derived. Also, approximate results with simplified structure and closed-form expressions are provided.\ud \ud Finally, a new hard decision fusion rule that combines arbitrary numbers of bits for different samples taken at different nodes is proposed. The best thresholds for the fusion rules using 2 bits, 3 bits and 4 bits are obtained through simulation. The bit error rate (BER) for hard fusion rule with 1 bit is provided.\ud \ud Numerical results are presented to show the accuracy of our analysis and provide insights. First, they show that our optimal energy allocation methods outperform the conventional system without optimal energy allocation, which could be as large as several dB’s in some cases. Second, with the increase of signal-to-interference-plus-noise ratio (SINR) for AF relaying with interference, the outage probability decreases accordingly for both random and fixed interferers. However, with the change of interference-to-noise ratio (INR) but with the SINR fixed, the outage probability for random interferers change correspondingly while the outage probability for fixed interferers remains almost the same. Third, our newly derived approximate expressions are shown to have acceptable performances in approximating outage probability in wireless multihop relaying system and multiple scattering channel considering interferences and without interferences. Last, our new hard decision fusion rule is shown to achieve better performance with higher energy efficiency. Also they show that there is a tradeoff between performance and energy penalty in the hard decision fusion rule.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • • Kezhi Wang, Yunfei Chen, Mohamed-Slim Alouini, Xu Feng, “BER and Optimal Power Allocation for Amplify-and-Forward Relaying Using Pilot-Aided Maximum Likelihood Estimation”, IEEE Transactions on Communications, (DOI: 10.1109/TCOMM.2014.2358219).
    • • Kezhi Wang, Yunfei Chen, Marco Di Renzo, “Outage Probability of Dual-Hop Selective AF With Randomly Distributed and Fixed Interferers”, IEEE Transactions on Vehicular Technology, (DOI: 10.1109/TVT.2014.2366727).
    • • Kezhi Wang, Tian Wang, Yunfei Chen, Mohamed-Slim Alouini, “Statistics of α - µ Random Variables and Their Applications in Wireless Multihop Relaying and Multiple Scattering Channels”, IEEE Transactions on Vehicular Technology, (DOI: 10.1109/TVT.2014. 2345258).
    • • Yunfei Chen, Kezhi Wang, Jiming Chen, “Hard-Decision Fusion With Arbitrary Numbers of Bits for Different Samples”, IEEE Transactions on Vehicular Technology, vol.62, no.2, pp. 879 - 884, Feb. 2013.
    • • Kezhi Wang, Tian Wang, Yunfei Chen, Mohamed-Slim Alouini, “Sum of Ratios of Products for α - µ Random Variables in Wireless Multihop Relaying and Multiple Scattering”, in IEEE 80th Vehicular Technology Conference (VTC2014-Fall), Vancouver, Canada, Sep. 2014.
    • 5.1 Comparison of exact and approximate PDFs of R = 2X2X11X131 + 3X1X24X22X25X232. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 5.2 Comparison of exact and approximate CDFs of R = 2X2X11X131 + 3X1X24X22X25X232. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
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