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To: Peter Ecclesine who wrote (27625)	8/1/2008 1:48:47 PM
From: Peter Ecclesine	Respond to of 46821

Hi, >>Single-channel 802.11n still requires more processing than single channel 802.11g, because of advanced features like STBC and LDPC, but STBC and LDPC are amenable to hardware implementation (which reduces their power demand), and these and other advanced features of 802.11n improve “rate at range,” meaning that the transmitter is active for shorter times, and can transmit at lower power"<< Two comments: STBC and LDPC bloat voice packets, and in a busy system, time on the channel is a major concern. There is an interesting tradeoff between robustness and time on the medium, which leads to voice using plain convolutionally coded OFDM, so the resulting packets take less time on the medium. >>"But the Wi-Fi Alliance (WFA) has waived the MIMO requirements for handsets,<< Regarding certifications, one could expect that the WiMAX Forum would not require a feature that Intel did not implement ;-) Similarly, the Wi-Fi Alliance uses a low-bar to testing interoperability, so low that any of several can veto requiring a "feature" of the standard ;-) petere