Ternary phase shift keying and its performance

An important class of digital modulation is phase shift keying (PSK). Ternary phase shift keying (TPSK) has not been focused upon until now because it is not suitable for transmitting binary information signals. However, it has theoretically excellent features for mobile communication systems, that is, it has splendid error rate characteristics and minimum amplitude fluctuation among all of the PSK schemes. The latter feature is very appealing for usage in mobile terminals in which nonlinear amplifiers have to be used. A new class of convolutional codes is proposed in order to use the TPSK scheme in practical systems. The TPSK scheme with the new convolutional code is suitable for transmitting binary signals and it improves the error rate characteristics without bandwidth expansion.