tailieunhanh - Báo cáo hóa học: " Research Article Frequency-Domain Equalization in Single-Carrier Transmission: Filter Bank Approach"

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 Frequency-Domain Equalization in Single-Carrier Transmission: Filter Bank Approach | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 10438 16 pages doi 2007 10438 Research Article Frequency-Domain Equalization in Single-Carrier Transmission Filter Bank Approach Yuan Yang 1 Tero Ihalainen 1 Mika Rinne 2 and Markku Renfors1 1 Institute of Communications Engineering Tampere University of Technology P. O. Box 553 33101 Tampere Finland 2 Nokia Research Center P. O. Box 407 Helsinki 00045 Finland Received 12 January 2006 Revised 24 August 2006 Accepted 14 October 2006 Recommended by Yuan-Pei Lin This paper investigates the use of complex-modulated oversampled filter banks FBs for frequency-domain equalization FDE in single-carrier systems. The key aspect is mildly frequency-selective subband processing instead of a simple complex gain factor per subband. Two alternative low-complexity linear equalizer structures with MSE criterion are considered for subband-wise equalization a complex FIR filter structure and a cascade of a linear-phase FIR filter and an allpass filter. The simulation results indicate that in a broadband wireless channel the performance of the studied FB-FDE structures with modest number of subbands reaches or exceeds the performance of the widely used FFT-FDE system with cyclic prefix. Furthermore FB-FDE can perform a significant part of the baseband channel selection filtering. It is thus observed that fractionally spaced processing provides significant performance benefit with a similar complexity to the symbol-rate system when the baseband filtering is included. In addition FB-FDE effectively suppresses narrowband interference present in the signal band. Copyright 2007 Yuan Yang et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Future wireless communications must provide ever increasing data