Parity generators in QCA nanotechnology for nanocommunication systems

The conventional complementary metal oxide semiconductor (CMOS) technology faces scalability and secondary effects issues in deep nanoscale regime. Therefore, many possible technologies are being explored to boost the current electronic industry. Quantum-dot cellular automata (QCA) is the possible technology to overcome the issues of conventional CMOS technology. QCA technology gives the advantages of area-efficient, low-power, and high-speed logic implementation in deep nanoscale regime. Exclusive-OR (XOR) gate is the fundamental logic required for different applications. Therefore, a reliable 3-input XOR gate using QCA technology is proposed in the paper. In communication system, the XOR gate can be utilized for the generation of parity bits. Hence, the proposed XOR gate is applied to develop the 2, 3, 4, and 5-input even and odd parity generators. The developed designs are more efficient in comparison with the existing designs. Any input parity generator can easily be developed using the proposed XOR gate. The number of cells, cell area, layout area, and design cost are improved for the proposed 3-input XOR gate as compared to the existing designs. The proposed 4-input parity generator consists of only 16 QCA cells and improves 76% design cost as compared to the best-reported work in the literature. Energy dissipation analysis is also presented for the proposed designs using the QCA Designer-E and QCA Pro. The proposed 4-input parity generator reduces 87.97% of total energy dissipation at a 1.5 Kink energy level as compared to the existing work.