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Multiple Access in Wireless Digital Networks

Norman Abramson, IEEE/U. Hawaii

One-line summary: Spread ALOHA is equivalnt to CDMA with a common spreading code for all users, so ALOHA techniques can be carried over to spread-spectrum systems.

Overview/Main Points


We can get the noise immunity of spread-spectrum together with the queueing behavior of TDMA, by implementing wideband CDMA with a single spreading code for all users but offsetting the channel bit sequences in time rather than by using orthogonal codes.


It's not clear to me why the "special case" for which plain old slotted ALOHA is asymptotically optimal is an important special case.
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