期刊
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
卷 64, 期 5, 页码 1766-1778出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2014.2334494
关键词
IEEE 802.15.4; industrial wireless sensor network (WSN); interference; link quality; link quality indicator (LQI); received signal strength (RSS)
资金
- Swedish Knowledge Foundation under the COINS Project
The ease of acquiring hardware-based link quality indicators (LQIs) is an alluring property for fast channel estimation in time-and safety-critical wireless sensor network (WSN) applications, such as closed-loop control and interlocking. The two rudimentary hardware-based channel quality metrics, i.e., received signal strength (RSS) and LQI, are the key constituents of channel estimation and a plethora of other WSN functionalities, from routing to transmit power control. Nevertheless, this paper highlights three deficient aspects of these two indicators: 1) Overall deceptiveness, i.e., the inability to reveal the presence of interference, falsely indicating excellent channel conditions in an unacceptably high fraction of cases; 2) the burstiness of missed detection which compromises the attempts to eliminate the deceptiveness by averaging; and 3) high mutual discrepancy of the two indicators, which is observed in 39%-73% of packets, throughout different scenarios. The ability of RSS and LQI to indicate IEEE 802.11 interference is scrutinized in a variety of scenarios in typical industrial environments using commercial-off-the-shelf hardware and realistic network topologies, giving the findings of this paper high general validity and practical relevance.
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