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This paper proposes a novel coding technique that aims to reduce the Transmission Bandwidth (BT) and Bit Error Rate (BER) vis-a-vis Conventional Differential Phase Shift Keying (CDPSK) in digital band pass transmission. In CDPSK two successive bits are used for encoding. The proposed method encodes information with respect to the consecutive two bits b(t-Tb) and b(t-2Tb). The encoded data is keyed on to the phase. The received signal is demodulated by using the present phase ?(t) and the two phases ?(t-Tb) and ?(t-2Tb). Comparative analysis between the two techniques reveals the advantages of the proposed technique.
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