Feedback delay effect on the performance of closed loop power control in CDMA system

Fahri, Filiyal (2010) Feedback delay effect on the performance of closed loop power control in CDMA system. Other thesis, Universitas Al Azhar Indonesia.

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Abstract

This final study is aimed to evaluate the effect of feedback delay on the performance of closed loop power control in CDMA System. Even though power control can mitigate the problem fluctuation due to fading, however due to the feedback delay, that advantage is invisible if this parameter is not decreased. Feedback delay is the total time that is taken by the power control from the mobile transmit signal is estimated at base station until power update command is received again at the mobile to do the transmission power update. Feedback delay make worse the performance of closed loop power control. To see this effect of feedback delay, in this study we will evaluate the system of closed loop at three delay interval, i.e. 1Tp, 2Tp and 3Tp. From the simulation the feedback cause the performance of system is degraded even at feedback delay=3Tp, the performance is drop until the system performance without power control. In addition, the increasing on fading rate may cause the performance get worse if we can not select the step size properly.

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