Uplink Capacity and Interference Avoidance for Two-Tier Cellular Networks

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文件名称：Uplink Capacity and Interference Avoidance for Two-Tier Cellular Networks
文件大小：186KB
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更新时间：2013-02-12 18:24:14
Uplink Capacity This paper presents an uplink capacity analysis and interference avoidance technique for a femtocell based two-tier DS-CDMA network using shared spectrum. Assuming randomly distributed macrocell users and femtocell base stations (BS), we evaluate a network-wide area spectral efficiency metric called the operating contour (OC) defined as the feasible combinations of the average macrocell users and femtocell BS per cell-site that meet a target outage constraint ǫ. A contribution of this work is an accurate characterization of the uplink outage probability taking cross-tier power control, path-loss and shadowing effects into account. We show that a time-hopped CDMA physical layer coupled with sectorized receive antennas shows dramatic performance improvements in both light and heavily loaded twotier networks, relative to a split spectrum two-tier network with omnidirectional femtocell antennas. These results provide insights into design of robust shared spectrum two-tier networks which achieve high area spectral efficiency