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A system and method for determining the transmission rate of a data signal at a receiver of a variable rate communications system. A vocoder at a transmitter encodes a frame of data into symbols according to one of a set of discrete data rates. When the data rate is lower than the maximum, each symb

A system and method for determining the transmission rate of a data signal at a receiver of a variable rate communications system. A vocoder at a transmitter encodes a frame of data into symbols according to one of a set of discrete data rates. When the data rate is lower than the maximum, each symbol is repeated a number of times as required to achieve a constant number of symbols in each frame. The data signal is transmitted at a power proportional to the data rate of the frame. A reference signal is also transmitted. The reference signal is transmitted at a constant power. Further, the data signal has the same carrier frequency as a reference signal so that they exhibit the same fading characteristics as they are transmitted through the channel. At a receiver, the power of the data signal and the power of reference signal are measured as received. The ratio of the power of the data signal to the power of the reference signal is compared with a predetermined ratio of the power of a maximum rate data signal to the power of the reference signal. The result of the comparison will indicate the encoded data rate of the received frame of data. The rate determined by the rate determination system is then used to properly decode the frame of data. A vocoder at the receiver further processes the data for interface with the user.

대표청구항 ▼

[ I claim:] [1.] In a variable rate communications system, a system for determining, at a receiver, the data rate of a received traffic signal, comprising:means for measuring the power of said traffic signal, and for providing a signal indicative of said measured traffic power;means for measuring th

[ I claim:] [1.] In a variable rate communications system, a system for determining, at a receiver, the data rate of a received traffic signal, comprising:means for measuring the power of said traffic signal, and for providing a signal indicative of said measured traffic power;means for measuring the power of a pilot signal, and for providing a signal indicative of said measured pilot power; andrate determination means for receiving said traffic power signal and said pilot power signal, determining the data rate of said traffic signal in accordance with a ratio of said traffic power signal and said pilot power signal, and providing a selected data rate for said traffic signal.