TY - JOUR
T1 - Building robust wireless LAN for industrial control with the DSSS-CDMA n cell phone network paradigm
AU - Wang, Qixin
AU - Liu, Xue
AU - Chen, Weiqun
AU - Sha, Lui
AU - Caccamo, Marco
N1 - Funding Information:
The research of this paper is supported by MURI N00014-01-0576, US National Science Foundation (NSF) ANI 02-21357, NSF CCR-0237884, NSF CCR-0325716, NSF CCR 02-09202, ONR N00014-02-1-0102, and by a Vodafone Fellowship (for the first author). The authors highly appreciate the advice by Professor Venugopal Veeravalli, Professor Bruce Hajek, Professor Christoforos Hadjicostis, Professor Rong Zheng, Ms. Tanya Crenshaw, and the anonymous reviewers. The completion of this paper is also owed a good deal to Mr. Qingbo Zhu for his assistance on using high-performance computer clusters and Mr. Zhaoyu Zhou for improving the technical writing.
PY - 2007/6
Y1 - 2007/6
N2 - Wireless LAN for Industrial Control (IC-WLAN) provides many benefits, such as mobility, low deployment cost, and ease of reconfiguration. However, the top concern is robustness of wireless communications. Wireless control loops must be maintained under persistent adverse channel conditions, such as noise, large-scale path loss, fading, and many electromagnetic interference sources in industrial environments. The conventional IEEE 802.11 WLANs, originally designed for high bandwidth instead of high robustness, are therefore inappropriate for IC-WLAN. A solution lies in the Direct Sequence Spread Spectrum (DSSS) technology: By deploying the largest possible processing gain (slowest bit rate) that fully exploits the low data rate feature of industrial control, much higher robustness can be achieved. We hereby propose using DSSS-CDMA to build IC-WLAN. We carry out fine-grained physical layer simulations and Monte Carlo comparisons. The results show that DSSS-CDMA IC-WLAN provides much higher robustness than IEEE 802.11/802.15.4 WLAN, so that reliable wireless industrial control loops become feasible. We also show that deploying larger processing gain is preferable to deploying more intensive convolutional coding. The DSSS-CDMA IC-WLAN scheme also opens up a new problem space for interdisciplinary study, involving real-time scheduling, resource management, communication, networking, and control.
AB - Wireless LAN for Industrial Control (IC-WLAN) provides many benefits, such as mobility, low deployment cost, and ease of reconfiguration. However, the top concern is robustness of wireless communications. Wireless control loops must be maintained under persistent adverse channel conditions, such as noise, large-scale path loss, fading, and many electromagnetic interference sources in industrial environments. The conventional IEEE 802.11 WLANs, originally designed for high bandwidth instead of high robustness, are therefore inappropriate for IC-WLAN. A solution lies in the Direct Sequence Spread Spectrum (DSSS) technology: By deploying the largest possible processing gain (slowest bit rate) that fully exploits the low data rate feature of industrial control, much higher robustness can be achieved. We hereby propose using DSSS-CDMA to build IC-WLAN. We carry out fine-grained physical layer simulations and Monte Carlo comparisons. The results show that DSSS-CDMA IC-WLAN provides much higher robustness than IEEE 802.11/802.15.4 WLAN, so that reliable wireless industrial control loops become feasible. We also show that deploying larger processing gain is preferable to deploying more intensive convolutional coding. The DSSS-CDMA IC-WLAN scheme also opens up a new problem space for interdisciplinary study, involving real-time scheduling, resource management, communication, networking, and control.
KW - Industrial control
KW - Real-time and embedded systems
KW - Reliability and robustness
KW - Wireless communication
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U2 - 10.1109/TMC.2007.1018
DO - 10.1109/TMC.2007.1018
M3 - Article
AN - SCOPUS:34247599452
SN - 1536-1233
VL - 6
SP - 706
EP - 719
JO - IEEE Transactions on Mobile Computing
JF - IEEE Transactions on Mobile Computing
IS - 6
ER -