Power command enhancement in mobile communication systems using an embedded fuzzy unit

We propose a fuzzy logic-based power command enhancement scheme for the mobile station of a cellular phone system. By defining the necessary linguistic variables of the power commands and corresponding fuzzy inference rules, an embedded fuzzy unit (EFU) is set up. The role of our EFU is to produce appropriate digital power commands instead of one-bit discrete commands directly obtained from the base station. Simulations show that the EFU-based mobile station can generate considerably smoother received power at the base station. The overshoot and channel tracking error are also small. In addition, our method has the advantage of simplicity, and is thus easy to be realized by hardware.