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首页> 外文期刊>IEICE Transactions on Communications >Effect of Fast Transmit Power Control on Forward Link Capacity of DS-CDMA Cellular Mobile Radio
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Effect of Fast Transmit Power Control on Forward Link Capacity of DS-CDMA Cellular Mobile Radio

机译：快速发射功率控制对DS-CDMA蜂窝移动无线电前向链路容量的影响

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This paper proposes applying fast transmit power control (TPC) to the forward link of a direct sequence- code division multi-access (DS-CDMA) cellular system. Orthog- onal spreading is assumed at a base station transmitter and co- herent RAKE combining is assumed at a mobile station receiver. In DS-CDMA cellular mobile radio, the multiple access inter- ference (MAI) from other cells and background noise limit the forward link capacity. Therefore, to increase the link capacity, fast transmit power control (TPC) can be introduced, which is similar to that developed for the reverse link, i.e., the transmit powers of forward link channels are independently raised or low- ered according to the instantaneous signal-to-background noise plus interference ratios (SIR’s) measured at mobile stations. Fast TPC is fast enough to track the multipath fading as well as slow variations in the distance-dependence path loss and shadowing. On the average, the transmit power is increased to a user closer to the cell edge so that the effects of both other-cell MAI and background noise can be reduced while it is decreased to a user closer to the cell center. The effect of the TPC parameters (TPC interval, TPC target value, TPC step size, etc) on the forward link capacity in single-and multi-cell environments is evaluated by computer simulation. It is shown that fast TPC can almost double the forward link capacity in a multi-cell environment.
机译：本文提出将快速发射功率控制（TPC）应用于直接序列码分多址（DS-CDMA）蜂窝系统的前向链路。假设在基站发射机处进行正交扩频，并在移动站接收机处进行相干瑞克合并。在DS-CDMA蜂窝移动无线电中，来自其他小区的多址干扰（MAI）和背景噪声限制了前向链路容量。因此，为了增加链路容量，可以引入快速发射功率控制（TPC），这与为反向链路开发的方法类似，即，前向链路信道的发射功率根据瞬时值独立提高或降低。在移动台测得的信噪比和干扰比（SIR）。快速TPC足够快，可以跟踪多径衰落以及距离相关路径损耗和阴影的缓慢变化。平均而言，向靠近小区边缘的用户增加发射功率，从而可以减小其他小区MAI和背景噪声的影响，而向靠近小区中心的用户减小发射噪声。通过计算机仿真评估TPC参数（TPC间隔，TPC目标值，TPC步长等）对单小区和多小区环境中前向链路容量的影响。结果表明，快速TPC在多小区环境中几乎可以使前向链路容量增加一倍。

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