Title page for etd-0717115-134816


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URN etd-0717115-134816
Author Jia-you Yang
Author's Email Address No Public.
Statistics This thesis had been viewed 5586 times. Download 701 times.
Department Communications Engineering
Year 2014
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Joint Beamforming and Power Allocation Design in Non-Orthogonal Multiple Access Systems
Date of Defense 2015-07-27
Page Count 51
Keyword
  • gradient method
  • superposition coding
  • multiple input and multiple output
  • non-orthogonal multiple access
  • Abstract Due to the rapid development of communication networks, people gradually increasingly rely on mobile communication devices in their daily life, resulting in increasing demand for network bandwidth and transmission rate.To satisfy serve requirement, mobile communications have developed toward the fourth generation systems. In the near future, the Fifth-generation mobile communications network which is expected to boost thousands times of capacity will be deployed in 2020. To deal with explosion amount of data transmission, 5G systems aim to enhance spectrum efficiency, network capacity, transmission rate, and reduce latency in the future. Non-orthogonal multiple access (NOMA) technique is one of key candidates currently. Multi-accepting technologies mostly allocate orthogonal radio resourced multiple users in time-domain, frequency domain, or code domain. By contrast, NOMA technology allows users access and share the same radio resource through multiple-access in power domain in order to effectively improve spectrum efficiency. In this paper, we consider a multi-input multi-output (MIMO) down-link system where using non-orthogonal multiple access technology is adopted.The base station uses superposition coding to superimpose signals regarding multiple users. We propose to optimize the transmission of a MIMO base station toward multiple users equipped with antenna based on perfect channel state information. The user can use successive interference cancellation to enhance the signal and interference plus noise ratio. We will design the beamforming vector of the base station as well as the optimal power allocation of downlink users, in order to maximize sum rate of the downlink system. In this paper, we consider two beamforming strategies, one is to match the beamforming vector to the stronger channel (MSC), and the other is to find the optimal beamforming vector in terms of maximum sum rate. Our results show that the proposed NOMA scheme achieves higher sum rate than conventional orthogonal multiple access system. With optimal beamforming vector, the propose scheme can support higher rate even when the geometrical angle between two users is large.
    Advisory Committee
  • Wei-Ho Chung - chair
  • Fan-Shuo Tseng - co-chair
  • Chao-Kai Wen - co-chair
  • Tsang-Yi Wang - co-chair
  • Wan-Jen Huang - advisor
  • Files
  • etd-0717115-134816.pdf
  • Indicate in-campus at 0 year and off-campus access at 2 year.
    Date of Submission 2015-08-17

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