Performance Evaluation and Spectral Efficiency Improvements for Wireless Networks With Interference

• Author / Creator

  Hemachandra, Kasun T

• The demand for high data rate wireless services has grown tremendously. The demand is expected to grow further at an increased pace. The scarcity of the usable radio frequency spectrum is a major bottleneck to cater to the growing demand for high data rate wireless services. Current cellular wireless networks rely on deploying small cells as a possible solution to cater to the growing demand. However, this practice has resulted in severe co-channel interference (CCI) levels in cellular networks.

  The first phase of this thesis investigates the impact of CCI on relay networks and distributed antenna systems, which are included in recent wireless standards such as long-term evolution advanced (LTE-A). The analytical results derived for system performance metrics, such as the outage probability and the ergodic rate, are used to obtain valuable insights for system design. The second stage of this thesis research proposes interference reduction schemes for wireless relay networks operating in the presence of CCI and analytically investigates the performance of each scheme. The analytical results are used to obtain crucial design insights such as the feedback rate and position of the relay nodes.

  Another approach to compensate for the spectrum scarcity is through improving the spectral efficiency (SE) of the wireless networks. As a step towards increasing SE, recently, there has been research efforts to implement full-duplex (FD) wireless communications. The main challenge in FD is the interference on the reception by its own transmission. Recent advances in self-interference reduction schemes have made FD communications feasible for short range communications. This thesis develops a theoretical framework to study the average data rate of FD communications for short range communications using device-to-device networks.

• Subjects / Keywords

  • Relay Networks
  • Full-duplex
  • Interference coordination

• Graduation date

  Fall 2015

• Type of Item

  Thesis

• Degree

  Doctor of Philosophy

• DOI

  https://doi.org/10.7939/R3K35MR7R

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.