Link Adaptation of Mobile Communication Networks with Limited Feedback Channels

  • Noha Abou Aly

Student thesis: Master's Thesis


This thesis considers end-to-end performance evaluation of wireless communication networks with link adaptation where orthogonal frequency division multiplexing (OFDM) is incorporated. In particular, the thesis focuses on evaluating the performance of adaptive wireless networks with limited feedback channels. Moreover, we consider imperfect feedback information where the feedback information might be erroneous or outdated due to the channel variations over time. The end-to-end performance considers the channel estimation errors in the feedforward channel and the noise and fading in the feedback channel. The thesis presents the performance of several adaptive techniques that are particularly designed for OFDM. The system and channel models are based on the state-of-the-art adaptive standards such as WiMAX. The thesis also presents a new adaptive OFDM system for limited feedback channels. The proposed system is designed to minimize the number of feedback bits sent to the transmitter by sending a quantized and truncated version of the estimated channel impulse response. The proposed limited feedback technique depends on time-domain vector of the channel state information (CSI) instead of the corresponding frequency-domain vector in order to reduce the feedback overhead.
Date of AwardDec 2015
Original languageAmerican English
SupervisorArafat Aldweik (Supervisor)


  • Adaptive modulation
  • OFDM
  • channel estimation
  • limited feedback channels
  • delay.

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