Stochastic analysis and control of real-time systems with random time delays
Automatica (Journal of IFAC)
Feedback Control of Dynamic Systems
Feedback Control of Dynamic Systems
Performance analysis and enhancements for IEEE 802.11e wireless networks
IEEE Network: The Magazine of Global Internetworking
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This paper discusses a new approach for wireless motion control. Existing wireless techniques suffer from large closed loop delays of several milliseconds, which is unacceptable in precision motion systems. These large delays are mainly caused by the protocol used, since these are optimized for transferring large amounts of data, not to minimize transmission delay. A new protocol and wireless system are proposed that reduce the closed loop transmission delay to less than 300 microseconds. The system has been verified in a real control system, and measurements show the performance, which is more than ten times better than existing techniques.