tailieunhanh - Báo cáo hóa học: " Research Article Other-Cell Interference Reducing Resource Allocation in OFDM-Based Asynchronous Cellular Systems"

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 Other-Cell Interference Reducing Resource Allocation in OFDM-Based Asynchronous Cellular Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 378097 9 pages doi 2008 378097 Research Article Other-Cell Interference Reducing Resource Allocation in OFDM-Based Asynchronous Cellular Systems Jin-Woo Lee June Moon and Yong-Hwan Lee School of Electrical Engineering and INMC Seoul National University P. O. Box 34 Kwanak Seoul 151-600 South Korea Correspondence should be addressed to Jin-Woo Lee jinu@ Received 4 April 2007 Accepted 25 September 2007 Recommended by Hikmet Sari Orthogonal frequency division multiplexing OFDM is considered as one of the most promising techniques for next-generation wireless access systems. However it may suffer from the so-called other-cell interference OCI in cellular environments. In this paper we consider a novel resource allocation scheme to reduce the OCI in OFDM-based asynchronous cellular systems. The proposed scheme can reduce the OCI by exploiting repetitive properties of cyclic prefix of OFDM symbol and asynchronous properties between the user and the base stations in other cells. The proposed scheme can be applied to various types of OFDMbased systems such as orthogonal frequency division multiple access OFDMA and multicarrier code division multiple access MC-CDMA systems. Simulation results show that the proposed scheme can reduce the OCI by nearly up to 1 dB compared to conventional schemes yielding an increase of the throughput of about 15 near the cell boundary in OFDM-based asynchronous cellular environments. Copyright 2008 Jin-Woo Lee 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. INTRODUCION Broadband wireless packet access systems have attracted for the achievement of high-speed transmission capacity. Orthogonal frequency division multiplexing OFDM is known as one