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Wireless communications at 2.4 GHz is subject to packet loss due to multi-path interference. This is especially severe in an indoor environment due to reflections from walls and fading due to other objects (e.g. people moving about). Some 2.4 GHz protocols such as Bluetooth use frequency hopping to combat multi-path, which is frequency selective. They are therefore relatively robust, only suffering from the occasional loss of a single packet. 802.15.4, on the other hand, is more sensitive to multi-path since it uses a fixed channel. A normal communication link between a pair of network nodes will use acknowledgements and retransmissions to recover lost packets. A receive-only element such as protocol analyzer, on the other hand, has no way of asking for a retransmission.

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Format:PDFSize:45 KB
Date:Mar 2008
Pages:2

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