Insert the following new paragraph at the end of 1.2: In addition, alternative physical layers (PHYs) for data communication devices with precision ranging, extended range, and enhanced robustness and mobility are specified.
IEEE 802.15.4a-2007
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IEEE Standard for Information technology– Local and metropolitan area networks– Specific requirements– Part 15.4: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for Low-Rate Wireless Personal Area Networks (WPANs): Amendment 1: Add Alternate PHYs