Digital FM receiver for recovering FM digital data frame in mobile communication system

摘要

There is provided a digital data receiver for recovering at least one message word signal from a digital data frame. The digital receiver includes a digital FM demodulator for receiving frequency modulated signals, and for demodulating a dotting sequence signal, a word sync signal and a message word signal of each sub-frame which is in digital data frame, a dotting detector for detecting a dotting sequence signal of at least one sub-frame among the signals demodulated by the digital FM demodulator, based upon a predetermined signal which is shorter than the length of each dotting sequence signal of the each sub-frame, detecting means for determining the termination of receiving of the digital data frame after the dotting detector detects the dotting sequence signal, and for detecting a new digital data frame followed by the digital data frame; and a message processor means for recovering a message word signal in the digital signal frame which is related to the dotting sequence signal detected by the dotting detector. A method for recovering at least one message word signal from a digital data frame is also disclosed.