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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here

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To: Hatim Zaghloul who wrote (5774)	11/1/1999 12:04:00 AM
From: ftth	Read Replies (1) of 12823

Hello Hatim, perhaps you can elaborate on a few things, as well as describing some of the differences between say a DVB-T implementation of COFDM, versus WOFDM(I couldn't find any data on the WiLAN website for the questions below): Wideband-OFDM.....wideband meaning? The carrier spacing is?....and the number of carriers is.... ? The guardband is...? If it's the carrier spacing that is broadening, it would seem the basic premise of OFDM is violated. Perhaps you could address this. When you say >>"too many carriers to lock on only one" are you referring to higher susceptibility to phase noise, and the reduction thereof due to a system with fewer total carriers? When you say <<"Wi-LAN introduced the concept of using an estimate of the frequency response of the channel as means to remove the effects of selective fading. This aspect is the main claim in the US and Canadian patens.">> This is another I'm having a bit of trouble with. From the wording, it sounds as though you're claiming as IP the introduction of channel estimation for the purpose of adaptive equalization? >>Wi-LAN has filed another patent on the use of the channel estimator to improve the performance of the forward error corrector. This is in lieu of(or as a substitute for) soft-decision decoding? And/or as a way to eliminate frequency-interleaved replication of symbols? Care to offer any performance improvement metrics? Also, if you are able to disclose this, please elaborate on the processing time for the channel estimator, including pilot recovery time and time to calculate the channel characteristics and compensation coefficients, as well as the update rate of this calculation. You probably see where I'm going with this, but if you can't comment I understand. dh

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