tailieunhanh - Báo cáo hóa học: " Research Article Modified Spatial Channel Model for MIMO Wireless 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 Modified Spatial Channel Model for MIMO Wireless Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 68512 7 pages doi 2007 68512 Research Article Modified Spatial Channel Model for MIMO Wireless Systems Lorenzo Mucchi 1 Claudia Staderini 1 Juha Ylitalo 2 and Pekka Kyosti3 1 CNIT University of Florence via santa marta 3 50139 Florence Italy 2 Centre for Wireless Communications University of Oulu 90014 Oulu Finland 3Elektrobit 90570 Oulu Finland Received 13 June 2007 Revised 19 September 2007 Accepted 11 November 2007 Recommended by G. K. Karagiannidis The third generation partnership Project s 3GPP spatial channel model SCM is a stochastic channel model for MIMO systems. Due to fixed subpath power levels and angular directions the SCM model does not show the degree of variation which is encountered in real channels. In this paper we propose a modified SCM model which has random subpath powers and directions and still produces Laplace shape angular power spectrum. Simulation results on outage MIMO capacity with basic and modified SCM models show that the modified SCM model gives constantly smaller capacity values. Accordingly it seems that the basic SCM gives too small correlation between MIMO antennas. Moreover the variance in capacity values is larger using the proposed SCM model. Simulation results were supported by the outage capacity results from a measurement campaign conducted in the city centre of Oulu Finland. Copyright 2007 Lorenzo Mucchi 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 communication aims at higher data rates. Since the radio spectrum is limited the requirement of high spectrum efficiency can be fulfilled by exploiting the spatial dimension of the radio channel 1 . In sufficiently rich multipath environments the channel .