Index Modulation for Modulation on Conjugate-Reciprocal Zeros (IM-MOCZ)

Abstract

This paper investigates the application of Index Modulation (IM) to Modulation on Conjugate-Reciprocal Zeros (MOCZ) to enhance spectral efficiency (SE) in short packet communications. The proposed IM-MOCZ scheme splits an $N$-bit message into two streams: $N-K$ bits select one of $2^{N-K}$ uniquely designed codebooks, while the remaining $K$ bits are transmitted with conventional binary-MOCZ (BMOCZ) using the selected codebook. At the receiver, Root Finding Minimum Distance (RFMD) or Direct Zero-Testing (DiZeT) detectors evaluate all candidate codebooks and compute penalty metrics, with a majority vote rule selecting the most confident codebook and recovering the transmitted message. The proposed IM-MOCZ can provide higher SE gains than conventional BMOCZ at the cost of increasing the computational complexity, with simulations demonstrating improved bit error rate (BER) and block error rate (BLER) performance for larger $K$ relative to $N$, when compared to conventional BMOCZ.