Analysis of Two-Step Subspace-Based Channel Estimation Method for OFDM Systems
| Autor: | Shih-Hao Fang, Jing-Shiun Lin |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Rank (linear algebra)
Computer science Orthogonal frequency-division multiplexing 020302 automobile design & engineering 020206 networking & telecommunications 02 engineering and technology Spectral efficiency Matrix (mathematics) 0203 mechanical engineering Modulation 0202 electrical engineering electronic engineering information engineering Bit error rate Algorithm Subspace topology Communication channel |
| Zdroj: | VTC Spring |
| DOI: | 10.1109/vtcspring.2017.8108395 |
| Popis: | Blind subspace-based channel estimation (SS-CE) methods have been widely discussed in orthogonal frequency division multiplexing (OFDM) systems since the spectral efficiency can be improved by reducing the number of pilot or training symbols. However, the signal matrix, constructed from transmitted signals, applied in SS-CE must be full rank to make SS-CE method successfully estimate the channel impulse response (CIR). Our previously proposed two-step signal matrix construction method applied in SS-CE has been published in 2015 and the corresponding probability of full rank is very close to one. In this paper, the two-step signal matrix will be further analyzed, such as probability of full rank analysis with different construction parameters, necessary condition analysis, and computational complexity analysis. Finally, simulation results show that the proposed SS-CE outperforms related SS-CE in terms of bit error rate (BER) performance even under time- varying channel environments, where the number of available OFDM symbols is few. |
| Databáze: | OpenAIRE |
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