Cognitive radio

The notion that through spread spectrum techniques, multiple senders and receivers can share the same radio frequencies, making far more efficient use of spectrum than the current system of allocating exclusive use of some set of frequencies to a single sender in a given region at a given time. For example, instead of granting a cellular phone carrier exclusive use of a block of frequencies, government could instead let a large number of carriers share the same frequencies. That would increase competition for phone traffic, leading to lower prices for users.