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To: Ramus who wrote (29419)5/7/1999 12:11:00 PM
From: D.J.Smyth  Read Replies (1) | Respond to of 152472
 
Walt, thanks for the reply <<Imagine, a la W-CDMA that every orthogonal channel has it's own asynchronous code word that has to be found by the matched filter each time a burst of data comes from that user. This represents an overhead constraint that is just simply not present in a coherent system. And it is a waste of system resources(data capacity)!>> that's exactly what I thought too. But, from a previous conversation, they claim it's a non-issue. There's a specialist in this area calling me later today to discuss this issue again and I will post his reply. Remember, it was GBT that was primarily instrumental in starting the 3G issues with the ITU. Q joined much later only after (I'm told) they considered it a threat. This was one attendee's claim.



To: Ramus who wrote (29419)5/8/1999 1:25:00 AM
From: engineer  Read Replies (2) | Respond to of 152472
 
Walt,

YOu should know that Walsh codes are only orthogonal if they are synchronous. the probolem is that the system assumptions break down when you got asynch Walsh codes.

If you do not maintain the orthgonality of the channels, then the users interfere with each other, hence they are not "white noise" to each other. Kind of like RF spurious being emitted all over the place, but in the digital domain.