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Báo cáo hóa học: " Research Article Channel Equalization in Filter Bank Based Multicarrier Modulation for Wireless "

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Channel Equalization in Filter Bank Based Multicarrier Modulation for Wireless | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 49389 18 pages doi 10.1155 2007 49389 Research Article Channel Equalization in Filter Bank Based Multicarrier Modulation for Wireless Communications Tero Ihalainen 1 Tobias Hidalgo Stitz 1 Mika Rinne 2 and Markku Renfors1 1 Institute of Communications Engineering Tampere University of Technology P.O. Box 553 Tampere FI-33101 Finland 2Nokia Research Center P.O. Box 407 Helsinki FI-00045 Finland Received 5 January 2006 Revised 6 August 2006 Accepted 13 August 2006 Recommended by See-May Phoong Channel equalization in filter bank based multicarrier FBMC modulation is addressed. We utilize an efficient oversampled filter bank concept with 2x-oversampled subcarrier signals that can be equalized independently of each other. Due to Nyquist pulse shaping consecutive symbol waveforms overlap in time which calls for special means for equalization. Two alternative linear low-complexity subcarrier equalizer structures are developed together with straightforward channel estimation-based methods to calculate the equalizer coefficients using pointwise equalization within each subband in a frequency-sampled manner . A novel structure consisting of a linear-phase FIR amplitude equalizer and an allpass filter as phase equalizer is found to provide enhanced robustness to timing estimation errors. This allows the receiver to be operated without time synchronization before the filter bank. The coded error-rate performance of FBMC with the studied equalization scheme is compared to a cyclic prefix OFDM reference in wireless mobile channel conditions taking into account issues like spectral regrowth with practical nonlinear transmitters and sensitivity to frequency offsets. It is further emphasized that FBMC provides flexible means for high-quality frequency selective filtering in the receiver to suppress strong interfering spectral components within or close to the used frequency band.