If I remember my communications theory classes from 35 years ago correctly, the effect of having many radios operating simultaneously in a code division multiplexed system will be a reduction in the signal-to-noise ratio for each user. So we should expect to see a reduction in range as the number of users increases.
Spread spectrum / CDM is no panecea. You can't cheat mother nature. Ultimately mother nature wins.
Last edited by JPMacG; 08-08-2013 at 01:20 PM.