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Interference analysis and capacity for forward link 3G CDMA network with adaptive antennas

机译：具有自适应天线的前向链路3G CDMA网络的干扰分析和容量

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摘要

In code division multiple access (CDMA) systems, the capacity of forward link (FL) communication to mobile receivers is limited primarily by co-channel interference (CCI). Adaptive antenna arrays (AAAs) that use antenna arrays along with advanced signal processing at the base station (BS) have been proposed to mitigate this limitation. For a 3G CDMA cellular network, where each BS equipped with an AAA serves mixture of voice and data users within its coverage, we study FL capacity and investigate the effects of different factors (array topology, multipath angle spread, data rate, and beamforming algorithm) on this capacity under Rayleigh fading channel. By modeling the instantaneous signal-to-interference power ratio received at the mobile, we derive the system outage equation that considers blocking of either desired voice or data user. Simulation results show that for the same element spacing and number of antenna elements per cell, the uniform circular array (UCA) topology results in larger capacity than the sectorized uniform linear array (ULA) topology does, and that a larger angle spread or data user rate reduces FL capacity.
机译：在码分多址（CDMA）系统中，到移动接收机的前向链路（FL）通信的能力主要受到同信道干扰（CCI）的限制。已经提出了使用天线阵列以及基站（BS）处的高级信号处理的自适应天线阵列（AAA）以减轻该限制。对于3G CDMA蜂窝网络，其中每个配备AAA的BS都在其覆盖范围内为语音和数据用户混合提供服务，我们研究了FL容量并研究了不同因素（阵列拓扑，多径角扩展，数据速率和波束形成算法）的影响）在瑞利衰落信道下的容量。通过对移动台接收的瞬时信号干扰功率比进行建模，我们得出了系统中断方程，该方程考虑了对所需语音或数据用户的阻塞。仿真结果表明，对于相同的单元间距和每个单元的天线单元数目，均匀圆阵列（UCA）拓扑结构比扇形均匀线性阵列（ULA）拓扑结构具有更大的容量，并且更大的角度扩展或数据用户速率会降低FL容量。

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