An improved system and method for rate detection of transmitted signals is disclosed
for use in a IS-95 CDMA downlink. For each speech frame, one of four possible bit
rates is used to encode the frame according to the standard. The present invention
describes a receiver and various processes that are able to detect which rate was
sent without the aid of flag bits or other mode indication information. According
to various embodiments of the invention different rate detection processes which
can exploit additional code information, such as CRC checks and convolutional coding,
are disclosed.
