A multi-code code division multiple access system allows a user at a radio transmitter unit to dynamically change its source data bit rate. In response to a user input selecting one of the plurality of source bit rates, an adjustable coding circuit in the transmitter spreads and transmits the user's...http://www.google.de/patents/US5442625?utm_source=gb-gplus-sharePatent US5442625 - Code division multiple access system providing variable data rate access to a user
