ABSTRACT
This chapter describes the theoretical framework for designing the dual purpose exponentially weighted moving average (EWMA) filter for both delay and packet dropout compensation of wireless networked control systems. This is to improve the control performance of the wireless process plant by applying the filter at the plant's actuator input. The Wireless highway addressable remote transducer network is modeled with both upstream and downstream delay components. The design takes into consideration both delay and packet dropout which are key elements that affect control performance of a system. Since packet dropout occurs, the control signal can be lost, and if the control signal is lost, the parameter's role in providing good current control signal is void. The modified filter has a response slower than that of the unmodified one to reduce the effect of packet dropout on the scheduled control signals generated by the filter. Therefore, it is suitable for maintaining the recently used control signals longer.
