Sorry, Steve
CDMA IS everyone babbling at the same time (not possible w/o some very complicated circuitry). The only way a 0 and 1 communications system can work reliably is with a master or a scheduler (master if indeed a central point exist, scheduler if not, otherwise the same). The problem with detecting scrambled comms is that the feedback may be scrambled too. I once had to rework someone elses syatem based on the shut u8p if scrambled - NEVER AGAIN.
enjoy the long weekend, Erik