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Partial Zero-Forcing Design and Achievable Rate Analysis for MIMO Relay Networks
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- Author / Creator
- Rahimian, Samira
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The ever-increasing demand for wireless communication networks has led an evolution in this technology. The next generation which is responsible for significantly higher data rates, energy efficiency and coverage is the 5th Generation (5G). 5G has introduced many infrastructural changes, hardware innovations, and signal processing techniques to enable high quality-of-service, energy, and bandwidth efficiency. This thesis is intended to investigate the achievable rate of relay networks considering new techniques and concepts in 5G and propose novel signal processing methods to pave the path for more efficient and greener telecommunications. We have accomplished three projects on signal processing design and performance analysis of 5G relay networks.
For multi-way relay networks (MWRNs), where multiple users mutually exchange information, we propose a novel relay processing design called partial zero-forcing which combines zero-forcing processing at the relay and successive interference cancellation at the users in the decoding process. The invented method provides extra degrees-of-freedom in the relay signal processing compared to zero-forcing, thus can significantly improve the system rate performance.
We also propose a new optimization method called modified gradient-ascent based on the gradient-ascent method to maximize the achievable rate using the extra degrees-of-freedom.The second work is on massive multiple-input multiple-output (mMIMO) MWRNs. We consider the practical energy-saving and low-cost mMIMO systems with low-resolution analog-to-digital converters (ADCs). A novel mathematical framework is proposed to derive a closed-form expression for the achievable rate of the network using random matrix theory including properties of Wishart and Haar matrices. This method can be applied and extended to other scenarios of mMIMO systems.
In the third work, we testify the novel application of simultaneous wireless information and power transfer (SWIPT) in a mMIMO relay network. Further, instead of the traditional linear antenna array, the case of planar antenna array at the relay is studied to exploit the elevation angle in the antennas beam pattern, a technique called 3D beamforming. We conduct performance analysis of the network, and then, the optimization of the 3D beam pattern for the maximum achievable rate. Significant rate improvement is achieved due to the extra degrees-of-freedom provided by SWIPT and 3D beamforming.
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- Graduation date
- Fall 2020
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- Type of Item
- Thesis
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- Degree
- Doctor of Philosophy
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- License
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