Co-channel Interference Cancellation for Reuse-1 Cellular OFDM Systems
| Autor: | Lin, Ta-Wei, 林大為 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 This thesis considers co-channel interference (CCI) cancellation in reuse-1 cellular OFDM systems. Due to strong interference, conventional channel estimation methods result in poor performance. We first propose two channel estimation algorithms with symbol-level interference-cancellation (SLIC) and code-level interference-cancellation (CLIC). Synergy with interference cancellation, the compressive sensing technique, such as subspace pursuit (SP) and step-wise optimal subspace pursuit (SOSP), are used to conduct the time-domain channel estimation. To enhance performance, turbo equalization is conducted in the receiver. It has been shown that match-filter-based ordered-successive-interference-cancellation (MF-OSIC) can be used to conduct soft demapping. Its performance approaches that of minimum-means-square-error-based OSIC (MMSE-OSIC), and the required computational complexity is lower. However, its performance is seriously degraded for the scenario of high QAM modulation. We then propose QR-decomposition-based SIC (QRD-SIC) and Cholesky-decomposition based SIC (CLD-SIC) to solve the problem. In addition, we propose a steepest-descent-based MMSE-OSIC (SD-MMSE-OSIC) to reduce the complexity. Simulations show that while the computational complexity of SD-MMSE-OSIC is much lower than that of MMSE-OSIC, the performance is similar. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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