The demand for high data rate communication is continuously increasing. To address this, studies on bit error rate improvements, cooperative diversity and transmit diversity have been topics of interest. In this paper, a novel Quad State- Paired QPSK (QS-PQPSK) modulation scheme is proposed. The proposed technique is simulated and compared with other main PSK-based modulation schemes. Preliminary simulation results show that in the presence of only Additive White Gaussian Noise (AWGN), QS-PQPSK performs better than 8-PSK in terms of symbol error rate and effective throughput. In a Rayleigh flat fading channel with AWGN, QS-PQPSK outperforms 8-PSK in terms of bit and symbol error rates and effective throughput. The performance of the proposed method also surpasses the other main PSK-based methods in most cases. This highlights the proposed QS-PQPSK technique as a viable spectrally efficient modulation technique for high data rate applications.