A protocol for rapid symbol duration adaptation and feedback in CDMA networks

We present a closed-loop architecture and protocols for rapid dynamic spreading gain adaptation and fast feedback between a transmitter and a receiver communicating with each other in CDMA networks. This protocol does not require the transfer of an explicit control message indicating the change of CDMA spreading gain from transmitter to receiver. Also, according to this protocol, the transmitter can change the spreading gain symbol-by-symbol as opposed to frame-by-frame, and feedback information (e.g., the fast-varying channel condition) can be exchanged almost as frequently as the symbol rate; thus, faster adaptation to the time-varying channel conditions of wireless networks, and/or the rate variation of traffic, is possible than with the existing frame-by-frame approach.