快速Lagrange算法在双速率多用户检测器的功率控制中的应用研究

本文提出了一种快速Lagrange算法,并将它应用于宽带码分多址扩频通信双速率多用户检测器的功率控制中,从而使系统在达到不同的信扰比的条件下,各个用户的发送功率之和最小。本文分析了用该算法对双速率多用户检测器进行最小发送功率控制的基本理论和实际性能,探讨了该算法中相关参数的确定方法。该算法利用平均和反馈技术加快了Lagrange算法的收敛速度,因此有较好的实时性。仿真结果表明与快速随机功率控制算法相比,快速Lagrange功率控制算法可以提高双速率多用户检测器输出信号的平均信扰比,降低信扰比的平均偏差,提高达到信扰比要求的用户数量。

The Application investigation of Fast Lagrange Algorithm for Power Control of Dual Rate Multi-user Detector

A kind of Fast Lagrange Algorithm is proposed, and study is conducted on the application of this algorithm for the power control of dual rate multi-user detectors, which makes the sum of the different users' transmitting powers minimum under the condition of each user meeting its target signal-to-interference ratio (SIR). The analysis is given to the theoretical basis and practical performance of minimum transmitting power control for dual rate multi-user detectors using this algorithm while the approach to calculate the parameters of the algorithm in terms of the requirements of different SIR is investigated. The proposed algorithm is of real time since it exploits the averaging and feedback to accelerate the convergence of the Lagrange algorithm. The simulation results have shown that the proposed Fast Lagrange Power Control Algorithm is superior to the Fast. Stochastic Power Control Algorithm in terms of not only the average SIR and average deviation of SIR of individual user' s output signal of dual rate multi-user detectors but also the fraction of users who converge to above 90% of target SIR.