POWER DISTRIBUTION ALGORITHM IN DS CDMA DISTRIBUTED POWER CELLULAR-SYSTEM/

In this paper, we propose a novel power distribution method which can be adopted in case of the nonuniform distribution for mobiles in DS/CD MA distributed power cellular system. DS/SS distributed power cellular system has been proposed for achieving RAKE reception in micro-cellul ar environment. In forward link of this system, optimum power distribu tion method which can minimize the required total transmitting power h as been discussed. The performance of this system has been shown in ca se of the uniform distribution for mobiles. In this paper, first, we p ropose a novel method in case of the nonuniform distribution. In the p roposed method, replacing the path and its combinations of signals fro m base stations successively, we can find a new condition of less powe r distribution which is passed over in a conventional distribution met hod. We adopt simple distribution models for mobiles and compare the p roposed method with the other methods by computing the total transmitt ing power and the quantity of calculations. As a result, we show that it is possible to almost obtain optimum power distribution by using th e proposed method, Next, we adopt a nonuniform distribution model, in which the difference of the number of users exists only in the center cell. Using this model, we compare the proposed method with the other methods by computing the total transmitting power, the quantity of cal culations, and a probability of impossible power distribution. Finally , in order to simplify and decrease the quantity of calculations of th e proposed method, we propose a modified calculation algorithm which i s applicable in case of that a new mobile station has increased. And w e show the performance of this algorithm.