Throughput-Based Mode Selection Criterion for Limited-Feedback Transmit Beamforming over Time-Varying Channels
| Autor: | Chang, Yi-Chieh, 張亦杰 |
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| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 In this thesis, we consider a dual-mode precoding method for limited-feedback multiple-input single-output (MISO) systems over time-varying channels, which follows the first-order Markov channel model. Since the channel statistics varies over time frames, codebooks of different sizes should be available to improve the system performance. In the considered system, there are two codebooks corresponding to different quantizations of channel vectors as adopted in the IEEE 802.16e standard. For fairness, the two modes have the same feedback rates. To choose one suitable mode for use under different channel correlations, we propose a throughput-based mode selection criterion to help the receiver decide the codebook to be used. A practical way to implement the criterion at the receiver is also proposed. Simulations indicate that the proposed scheme is superior to that with a single codebook and perform comparably to those existing mode selection criteria. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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