Abstract
Quantum-dot cellular automata (QCA) are a prospective nanotechnology with striking performance for complementing complementary metal oxide semiconductor (CMOS) based integrated circuit technique. For applications in communications, serial concatenated convolutional codes (SCCCs) have been investigated due to their negligible error floor for deep space communication. Using a combination of top-down and bottom-up approaches, we design and implement an SCCC encoder in QCA technology. In this work, a Bose–Chaudhuri–Hocquenghem (BCH) code encoder with the ability for correcting burst errors, a pseudo random interleaver for permuting signal bits, and a convolutional code encoder for correcting random errors are logically connected in series for composing the SCCC encoder. Specifically, inspired by the idea for a divider design, a layout for (n, k, t) BCH code encoders is proposed and implemented with QCA cells. For using the four-phase clock mechanism, we also devise the serial-to-parallel and parallel-to-serial converters for constructing the interleaver. In addition, (u, f, K) convolutional code encoders with various constraint lengths are designed as well. The functionalities and validity of the proposed circuit design are verified by using QCADesigner.
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