Realistic Spatio-Temporal Channel Model for Broadband MIMO WLAN Systems Employing Uniform Circular Antenna Arrays
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Realistic Spatio-Temporal Channel Model for Broadband MIMO WLAN Systems Employing Uniform Circular Antenna ArraysAbstract
The development of realistic spatially and temporally clustered channel models is a prerequisite to the creation of successful architectures of the future MIMO wireless communication systems. IEEE 802.11n channel models are designed for indoor wireless local area networks for bandwidths of up to 100 MHz, at frequencies of 2 and 5 GHz. The channel models comprise a set of 6 realistic profiles, labeled A to F, which cover the scenarios of flat fading, residential, residential/small office, typical office, large office, and large space. Each channel scenario is represented by distinct path loss model, multipath delay profile, number of clusters and taps with predefined values for angular and power parameters. These realistic models have been applied widely for MIMO systems utilizing only uniform linear array (ULA). In this paper, modifications to the standard IEEE 802.11n channel model are applied to include uniform circular array (UCA) geometries. Characteristics of spatial fading corrections and the eigenvales distribution of subchannels for UCA-MIMO systems are investigated. The effect of the azimuth orientation and line of sight component existence on the system capacity for both ULA and UCA arrays are studied. Also, the water filling power allocation scheme is investigated under different realistic conditions. Furthermore, the link performance of Vertical Bell Laboratories Layered Space Time (VBLAST) that employs UCA at the receiver front is presented by utilizing the developed channel model.
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