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To: Clarksterh who wrote (1213)	4/11/1999 7:37:00 PM
From: Bernard Levy	Read Replies (1) \| Respond to of 5853

Hi Clark: I do not agree with several of the points you make in your post: a) If UWB radio employs truly a very large BW (say of the order of a GHz), its interference effect on narrowband channels, such as TV channels, will be minimal, even with many users. b) It is true that theoretically, impulse radio with time hopping multiple access leads to the same processing gains as standard CDMA over a channel with the same BW. However, QCOM would find it impossible to make its CDMA work with a BW of one or more Ghz, while impulse radio has already been demonstrated to work (admittedly not commercially) in such situations. c) Impulse radio has a very good chance of being successful for indoor local area networks, i.e. for short ranges. I encourage all technically oriented readers to read the papers coming out of Robert Scholtz's research group at USC over the last few years. Most of the key issues associated to the systems design of UWB local area networks have been worked out. The key hurdle at this stage is regulatory, i.e., getting the FCC to agree with its deployment. The next hurdle will of course be financial and commercial, i.e., technically sound systems do not always find success in the market place. I find it rather ironic that the most strident critics of impulse radio should come out of the QCOM camp, given that QCOM was almost strangled by regulatory and standards setting opposition while it was in its infancy. Best regards, Bernard Levy