A new 3-dimensional modulation-coding system

The classic problem of transmitting digital information with minimum probability of error in the presence of noise, fading and various interferences is investigated. The multi-gap shift keying MGSK technique is introduced and used in conjunction with the classic MFSK and MPSK techniques to increase the signal´s immunity to noise and interferences. The same bits of information will control the phase, frequency and gap location of a composite MGSK/MPSK/MFSK signal (word) and, at the composite receiver, maximum likelihood decisions will minimize the probability of word errors. Modest amount of convolution error correction is needed so that the total effective rate is not sacrificed. The average performance of the new 3-dimensional signaling scheme was analysed and the average probability of bit errors with and without coding in the presence of AWGN and Raleigh fading was determined.