tailieunhanh - Báo cáo hóa học: " Research Article An Adaptive Channel Interpolator Based on Kalman Filter for LTE Uplink in High Doppler Spread Environments"

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 An Adaptive Channel Interpolator Based on Kalman Filter for LTE Uplink in High Doppler Spread Environments | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 893751 10 pages doi 2009 893751 Research Article An Adaptive Channel Interpolator Based on Kalman Filter for LTE Uplink in High Doppler Spread Environments Bahattin Karakaya 1 Hiiseyin Arslan 2 and Hakan A. Cirpan1 1 Department of Electrical and Electronics Engineering Istanbul University Avcilar 34320 Istanbul Turkey 2 Department of Electrical Engineering University of South Florida 4202 E. Fowler Avenue ENB118 Tampa FL 33620 USA Correspondence should be addressed to Bahattin Karakaya bahattin@ Received 17 February 2009 Revised 5 June 2009 Accepted 27 July 2009 Recommended by Cornelius van Rensburg Long-Term Evolution LTE systems will employ single carrier frequency division multiple access SC-FDMA for the uplink. Similar to the Orthogonal frequency-division multiple access OFDMA technology SC-FDMA is sensitive to frequency offsets leading to intercarrier interference ICI . In this paper we propose a Kalman filter-based approach in order to mitigate ICI under high Doppler spread scenarios by tracking the variation of channel taps jointly in time domain for LTE uplink systems. Upon acquiring the estimates of channel taps from the Kalman tracker we employ an interpolation algorithm based on polynomial fitting whose order is changed adaptively. The proposed method is evaluated under four different scenarios with different settings in order to reflect the impact of various critical parameters on the performance such as propagation environment speed and size of resource block RB assignments. Results are given along with discussions. Copyright 2009 Bahattin Karakaya 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 3GPP Long-Term Evolution LTE aims at .