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How Bluetooth, UWB, and 802.11 stack up on power consumption

4/15/2008 11:00 AM EDT
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Santhoff
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re: How Bluetooth, UWB, and 802.11 stack up on power consumption
Santhoff   4/17/2008 5:02:44 PM
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UWB does indeed have the lowest power consumption of any wireless technology available today at the PHY Layer. What is meant by at the "PHY Layer" is the actual radiated Radio Frequency energy used to close a link budget. What the article does not say in the case of the WiMedia implementation is the huge complexity and associated power consumption inherent in both the Transmitter and Receiver design of WiMedia devices. The Transmitter requires a 6 bit DAC at 1+ GHz to generate the OFDM symbol and the Receiver requires two (For I/Q RF) ADC's using 4 to 6 bits at 1+ GHz to process the received RF. These by themselves are highly power consumptive now add the digital baseband processing to feed and process the DAC and two ADC's and you really start getting into some power. (We haven't even talked about the FEC processing yet) Bottom line, UWB over the air PHY interface is the lowest power wireless technology available today. HOWEVER, I am not aware of ANY WiMedia implementation that is less than 2 Watts which is a long way from the claimed 250mW.

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