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Novel Semi-Blind ICI Equalization Algorithm for Wireless OFDM Systems.
- Source :
- IEEE Transactions on Broadcasting; Jun2006, Vol. 52 Issue 2, p211-218, 8p, 1 Diagram, 8 Graphs
- Publication Year :
- 2006
-
Abstract
- Intercarrier interference is deemed as one of the crucial problems in the wireless orthogonal frequency division multiplexing (OFDM) systems. The conventional ICI mitigation schemes involve the frequency-domain channel estimation or the additional coding, both of which require the spectral over- head and hence lead to the significant throughput reduction. Besides, the OFDM receivers using the ICI estimation rely on a large-dimensional matrix inverter with high computational complexity especially for many subcarriers such as digital video broadcasting (DVB) systems and wireless metropolitan-area net- works (WMAN). To the best of our knowledge, no semi-blind ICI equalization has been addressed in the existing literature. Thus, in this paper, we propose a novel semi-blind ICI equalization scheme using the joint multiple matrix diagonalization (JMMD) algorithm to greatly reduce the intercarrier interference in OFDM. However, the well-known phase and permutation indeterminacies emerge in all blind equalization schemes. Hence we also design a few OFDM pilot blocks and propose an iterative identification method to determine the corresponding phase and permutation variants in our semi-blind scheme. Our semi-blind ICI equalization algorithm integrating the, JMMD with the additional pilot-based iterative identification is very promising for the future high-throughput OFDM systems. Through Monte Carlo simulations, the QPSK-OFDM system with our proposed semi-blind ICI equalizer can achieve significantly better performance with symbol error rate reduction in several orders-of-magnitude. For the 16QAM-OFDM system, our scheme can also improve the performance over the plain OFDM system to some extent. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00189316
- Volume :
- 52
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Broadcasting
- Publication Type :
- Academic Journal
- Accession number :
- 21063784
- Full Text :
- https://doi.org/10.1109/TBC.2006.875652