Uplink capacity of a variable density cellular system with multicell processing
Uplink capacity of a variable density cellular system with multicell processing
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DOI：
10.1109/tcomm.2009.07.070626
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发表时间：
2009-07
影响因子：
8.3
通讯作者：
E. Katranaras;M. Imran;C. Tzaras
中科院分区：
文献类型：
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作者：
E. Katranaras;M. Imran;C. Tzaras
在这项工作中，我们调查的蜂窝系统的上行链路的信息理论容量。假设所有基站的集中处理，我们考虑幂律路径损耗模型沿着与可变小区大小（可变密度的基站），我们制定了平均路径损耗近似。考虑实际的莱斯平坦衰落环境，推导出了大量用户分布在每个小区时，每个小区的容量的分析结果。我们扩展这种一般的方法来模拟扇区化蜂窝系统的上行链路。为此，我们假设用户终端由完全定向的接收器天线服务，将小区覆盖区域划分为完全无干扰的扇区。我们展示了如何增加容量（由于自由度增益）相比，单接收天线系统，我们调查的渐近行为时，部门的数量变大。我们进一步扩展分析，以找到当用于每个基站的多个天线是全向的和不相关的（自由度增益上的功率增益）时的容量。我们验证了随机衰落实现的Monte Carlo模拟的数值解，我们解释了现实世界中的系统的结果。
In this work we investigate the information theoretic capacity of the uplink of a cellular system. Assuming centralised processing for all base stations, we consider a power-law path loss model along with variable cell size (variable density of Base Stations) and we formulate an average path-loss approximation. Considering a realistic Rician flat fading environment, the analytical result for the per-cell capacity is derived for a large number of users distributed over each cell. We extend this general approach to model the uplink of sectorized cellular system. To this end, we assume that the user terminals are served by perfectly directional receiver antennas, dividing the cell coverage area into perfectly non-interfering sectors. We show how the capacity is increased (due to degrees of freedom gain) in comparison to the single receiving antenna system and we investigate the asymptotic behaviour when the number of sectors grows large. We further extend the analysis to find the capacity when the multiple antennas used for each Base Station are omnidirectional and uncorrelated (power gain on top of degrees of freedom gain). We validate the numerical solutions with Monte Carlo simulations for random fading realizations and we interpret the results for the real-world systems.