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To: Clarksterh who wrote (24619)	3/22/1999 9:49:00 AM
From: John Stichnoth	Read Replies (1) \| Respond to of 152472

<whether Cinecomm is tied to CDMA?> The central issues for Cinecomm and CDMA are the same: 1. Encryption/Privacy 2. Compression/Capacity 3. Quality/Noise 4. Cost I'll be the first to say I don't know the specs of the Cinecomm transmission system, nor really (from an engineer's viewpoint) why CDMA is better than TDMA/GSM. I do know that CDMA is the technical winner in the wireless market, and the same factors that drive wireless are present in the film distribution question. Thus, a lot of the CDMA techniques could be brought to bear on Cinecomm. Is there any reason a separate encryption scheme (eg., PGP) couldn't be overlaid on top of CDMA in transmitting information? I wish the Hughes/Cinecomm site had a more rigorous explanation. Best, John

To: Clarksterh who wrote (24619)	3/22/1999 10:30:00 AM
From: Ramus	Respond to of 152472

Clark, -I am reasonably sure that the Walsh codes are not used to separate channels on the reverse link. Instead they are used to code the data stream and a mobile will use most of the different Walsh codes in any one second (thus it cannot be used to separate the various mobiles). The reason that the Walsh codes are not used as channels on the reverse link is that the Walsh codes do not 'work' when not time synched with each other and this is difficult to control on the reverse link. Your're correct. In the mobile transmitter the Walsh covers are applied then the long code and then the spreading!! I'm partially awake now! Walt

To: Clarksterh who wrote (24619)	3/22/1999 10:45:00 PM
From: Drew Williams	Read Replies (1) \| Respond to of 152472

<<I am reasonably sure that the Walsh codes are not used to separate channels on the reverse link. Instead they are used to code the data stream and a mobile will use most of the different Walsh codes in any one second (thus it cannot be used to separate the various mobiles). The reason that the Walsh codes are not used as channels on the reverse link is that the Walsh codes do not 'work' when not time synched with each other and this is difficult to control on the reverse link. Just FYI.>> Not being an engineer, I have been really confused about these "Walsh codes." Suddenly, though, I understood how the San Francisco 49's have been so successful over the last twenty years or so -- Joe Walsh hid little CDMA radios in their helmets! <g>