Bipolar binary shift pulse keying modulation and demodulation method

The present invention discloses a bipolar binary shift pulse keying modulation and demodulation method. The method is characterized by carrying out the pulse modulation on a symbol 0 having the reverse polarity with the pulse modulation of a symbol 1 on the basis of a binary shift pulse keying modulation mode in a uniform orthogonal binary shift keying modulation and demodulation method and in the initial information modulation interval of each symbol cycle, thereby greatly reducing and even completely eliminating the all discrete line spectrums containing a carrier frequency, and substantially expanding the constellation point distances among the symbols. By adopting a dual matching filtering method of impact filtering-multiplying coherent carrier-low pass filtering or band-pass filtering- related demodulation to demodulate, and by utilizing the dual filtering noise reduction removing interference capability of the impact filtering and the low pass filtering or band-pass filtering and the dual symbol energy maximization effect of the coherent demodulation and related demodulation, a received signal to noise ratio and an energy utilization rate can be improved remarkably, and the noise restraint anti-interference performance of a system can be enhanced substantially.