Interference avoidance and power control strategies for coded frequency hopped cellular systems

C.C. Wang, G. Pottie
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引用次数: 14

Abstract

In a frequency hopped CDMA (FH-CDMA) system, the principal impairment is interference generated by users sharing the same time-frequency slot. If users have fixed hopping patterns, a system can monitor the average interference in every time-frequency slot. It can then assign a new user to communicate only in the M lowest interference slots out of every N slots in the user's hopping pattern. The transmit power for the new user is then reduced on the average. System capacity is increased since each user generates less interference. The capacity for a FH-CDMA system in which every user transmits M out of every N slots with equal received power for every user is derived. Power control algorithms which allow users to have different signal-to-interference ratio (SIR) requirements have been implemented to maximize the capacity of the system. In addition, error correcting codes not only protect against interference, noise, and fading, but can also increase the capacity by permitting admission of users even when some of the slots have poor SIR.
编码跳频蜂窝系统的干扰避免与功率控制策略
在跳频CDMA (FH-CDMA)系统中,主要的干扰是用户共用同一时频时隙所产生的干扰。如果用户有固定的跳频模式,系统可以监测每个时频槽的平均干扰。然后,它可以分配一个新用户只在用户跳频模式中每N个时隙中的M个最低干扰时隙进行通信。然后,新用户的发射功率平均降低。系统容量增加,因为每个用户产生的干扰更少。推导了在每个用户接收功率相等的情况下,每个用户从每N个时隙中发送M个信号的FH-CDMA系统的容量。功率控制算法允许用户有不同的信号干扰比(SIR)要求,以最大限度地提高系统的容量。此外,纠错码不仅可以防止干扰、噪声和衰落,而且可以在某些槽位SIR差的情况下允许用户进入,从而增加容量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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