Hybrid Index and Number Modulation

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier transmis sion technique used in many high data rate and wide bandwidth wireless communi cation systems including cellular telecommunications and Wi-Fi. Data is transmitted using parallel subcarriers with in an OFDM symbol. It has many advantages like im munity to selective fading, resilience to interference, resilient to narrow band effects, simpler channel equalization, etc. which makes it a promising candidate for future wireless systems. In this thesis, Hybrid Index and Number modulation (HIN) technique is proposed for enhancing both Energy Efficiency (EE) and Spectrum Efficiency (SE) by effectively transmitting additional data bits by changing both the number and index of activated sub carriers with in an OFDM subblock. A low complexity threshold based detector is also proposed which detects the activation pattern, decodes information bits and demodulate the pulse amplitude modulation symbols on activated subcrriers. The SE and Bit Error Rate (BER) performance analysis for the proposed OFDM-HIN technique are carried out using Monte Carlo simulation study. The proposed OFDM-HIN scheme offers better BER and throughput performance in comparison to OFDM-Index Modulation, OFDM-Subcarrier Number Modulaion, and classical OFDM with equivalent SE and power at mid to high SNR values.