Reduced Subcarrier Index Modulation Scheme in OFDM System for Next-Gen Wireless Networks

Orthogonal frequency division multiplexing (OFDM) has proved itself as a proficient multicarrier transmission technique to be successfully utilized in 5G and next-generation wireless communication. However, conventional OFDM suffers from the limitation of high peak-to-average-power ratio (PAPR). Subcarrier index modulation (SIM) has already been established as one of the efficient techniques to mitigate this high PAPR problem. In this work, we have proposed a novel modulation algorithm named as reduced subcarrier index modulation-OFDM (RIM-OFDM), which offers further considerable reduction in PAPR value and improved bandwidth utilization. In this paper, this newly proposed scheme has been mathematically established and block diagram for its realistic implementation has been described in detail. PAPR performance along with improvement in spectral efficiency of this technique, over SIM, has been investigated. Bit error rate (BER) performance is also studied and compared with that of classical OFDM. The results reveal that RIM-OFDM has come up as an optimized scheme, in terms of PAPR mitigation, bandwidth efficiency enhancement and low BER, for future wireless communication.