Date of Award:

5-2016

Document Type:

Dissertation

Degree Name:

Doctor of Philosophy (PhD)

Department:

Computer Science

Committee Chair(s)

Ming Li

Committee

Ming Li

Committee

Nicholas Flann

Committee

Haitao Wang

Committee

Rose Qingyang Hu

Committee

Ryan M. Gerdes

Abstract

With the ever-growing number of wireless systems, the problem of spectrum scarcity is becoming more important than ever. Many devices coexist in the same frequency band, e.g., IEEE 802.11 (WiFi), 802.15.4 (ZigBee), 802.16 (WiMax), and Bluetooth in the ISM bands. Coexisting in the crowded spectrum bands inevitably leads to mutual interferences. For a wireless network, the interference could be from external sources such as microwave oven and cordless phone, or from internal nodes within multi-flow and multi-hop wireless networks. All these interferences can be detrimental to the performance of co-locating networks if they are not properly mitigated. In my dissertation, we try to improve the maximum throughputs of coexisting multi-hop wireless networks by utilizing advanced physical-layer techniques, such as wireless MIMO and reconfigurable antennas (RA). The advance of such new physical-layer techniques provides new optimization freedoms and hasn’t been well exploited by previous works.

My first work is about the interference mitigation in wireless body area networks. We propose a joint routing and power control method to select the good quality links that are not severely affected by the external interference sources. Our scheme could guarantee the quality of service while minimizing the overall energy consumption. My second work is about the cooperative interference mitigation in multi-hop wireless networks, where we utilize the emerging wireless MIMO by cooperatively mitigating internal interferences to enhance the overall network throughputs. In my third and fourth work, I study the coexisting problem using game theoretical approach. Different from my previous work, we design a game theoretical framework to capture the competitive and selfish nature of coexisting networks. My last work is about throughput optimization using reconfigurable antennas, which is another emerging physical-layer technique as wireless MIMO. Our results show that by using reconfigurable antennas, we could improve the overall network throughput as well.

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