论文部分内容阅读
介绍了基于ＩＳ－９５标准的ＣＤＭＡ反向功率控制的概念和原理，提出了一种用测量Ｍ进制正交符号能量的方法来估计信噪比的反向闭环功率控制算法和一种反向外环功率控制的算法，并对其算法实现进行了仿真。仿真结果对功控调整步长参数作了优化，验证了ＩＳ－９５所建议的功控步长取１．０ｄＢ左右的正确性。另外，还仿真了多普勒效应对仿真结果的影响，指出移动台运动速度加快，其多普勒频移增大，导致了接收信号质量的恶化，降低了系统的爱尔兰容量。
The concept and principle of CDMA reverse power control based on IS-95 standard are introduced. An inverse closed-loop power control algorithm is proposed to estimate signal-to-noise ratio by measuring the energy of M-ary orthogonal symbol, Outer loop power control algorithm, and its algorithm is simulated. The simulation results optimize the step parameters of the power control and verify the correctness of the power control step length of about 1.0 dB proposed by IS-95. In addition, the effect of the Doppler effect on the simulation results is also simulated. It is pointed out that the moving speed of the mobile station is accelerated and the Doppler frequency shift of the mobile station is increased. As a result, the received signal quality deteriorates and the Irish capacity of the system is reduced.