Cascade-mode-based quaternary minimum-shift keying ( MSK) modulation method and device
A quaternary, mode technology, applied in the direction of frequency modulation carrier system, etc., can solve the problem that the anti-interference ability is not as good as phase shift keying and differential phase shift keying, etc., and achieve the effect of constant envelope, small bandwidth and continuous phase
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[0016] Such as figure 1 As shown, the current symbol symbol a to be sent k 101 is divided into upper and lower channels through serial-to-parallel conversion b k 102 and c k 103,b k 102 and c k 103 After XOR operation, get d k 104:c k 103 The other path passes through the 2FSK module 110 to obtain a frequency interval of 1 / T s The 2FSK signal is connected to the 2MSK module 111 after passing through the bandpass filter 108 . d k 104 is differentially encoded to obtain e k 105,e k Then through the serial-to-parallel conversion, the upper branch passes through the delayer 106 to obtain q k 107 is connected with the same direction component of 2MSK module 111, and the lower branch is p k 109 is connected to the quadrature component terminal of the 2MSK module 111. The output end of the 2MSK module 111 is connected to the bandpass filter 112 to output a 4MSK signal. Among them, the 2FSK system is a process of splitting the carrier frequency in one level. In the proces...
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