Electronic Thesis and Dissertation Repository

Thesis Format

Monograph

Degree

Doctor of Philosophy

Program

Electrical and Computer Engineering

Supervisor

Raveendra Rao

2nd Supervisor

Quazi Rahman

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) with Index Modulation (OFDM-IM) system with arbitrary and are suggested and investigated for data transmission over realistic fading and shadowing wireless communication channels. In these OFDM-IM systems, data is conveyed to the receiver using characteristics of signal mapper in the OFDM system and by using indices of active subcarriers dictated by the type of IM employed. Two types of index modulations, arbitrary and Look-Up Table (LUT), are described and examined for selection of active subcarriers in OFDM systems with OOK (ON-OFF Keying), M-QAM (M-ary Quadrature Amplitude Modulation), and M-PSK (M-ary Phase Shift Keying) signal mappers. Models of these systems are presented and described. A variety of receivers in OFDM-IM system are considered and their performances are evaluated. The OFDM-IM system metrics are introduced to measure its performance: i) Average Bit Error Probability (ABEP); ii) Outage Probability (

Pout ); iii) Energy Efficiency (EE); and iv) Spectral Efficiency (SE). Theoretical expressions for these metrics are derived and illustrated. Also, these metrics of OFDM-IM system are obtained using extensive computer simulations and are compared with theoretical results.

In general, it is observed that ABEP performance of OFDM-IM system is superior to that of conventional OFDM system without IM, for perfect Channel State Information (CSI) at the receiver. It is shown that OFDM-IM system with LUT method can offer an advantage of 3

dB in error performance over conventional OFDM system, which is equivalent to an enhancement of 0.33 bits/J of Energy Efficiency. Furthermore, it is observed that when adaptive modulation is employed in an OFDM-IM system with M-QM mapper, Spectral Efficiency can be improved by 1.5 bits/s/Hz. By using Maximal Ratio Combining (MRC) diversity receiver, the energy and spectral efficiencies of OFDM-IM system are determined by the number of independent channels between transmitter and receiver.

Summary for Lay Audience

Orthogonal Frequency Division Multiplexing (OFDM) with Index Modulation (OFDM-IM) system with arbitrary and are suggested and investigated for data transmission over realistic fading and shadowing wireless communication channels. In these OFDM-IM systems, data is conveyed to the receiver using characteristics of signal mapper in the OFDM system and by using indices of active subcarriers dictated by the type of IM employed. Two types of index modulations, arbitrary and Look-Up Table (LUT), are described and examined for selection of active subcarriers in OFDM systems with OOK (ON-OFF Keying), M-QAM (M-ary Quadrature Amplitude Modulation), and M-PSK (M-ary Phase Shift Keying) signal mappers. Models of these systems are presented and described. A variety of receivers in OFDM-IM system are considered and their performances are evaluated. The OFDM-IM system metrics are introduced to measure its performance: i) Average Bit Error Probability (ABEP); ii) Outage Probability (

Pout ); iii) Energy Efficiency (EE); and iv) Spectral Efficiency (SE). Theoretical expressions for these metrics are derived and illustrated. Also, these metrics of OFDM-IM system are obtained using extensive computer simulations and are compared with theoretical results.

In general, it is observed that ABEP performance of OFDM-IM system is superior to that of conventional OFDM system without IM, for perfect Channel State Information (CSI) at the receiver. It is shown that OFDM-IM system with LUT method can offer an advantage of 3

dB in error performance over conventional OFDM system, which is equivalent to an enhancement of 0.33 bits/J of Energy Efficiency. Furthermore, it is observed that when adaptive modulation is employed in an OFDM-IM system with M-QM mapper, Spectral Efficiency can be improved by 1.5 bits/s/Hz. By using Maximal Ratio Combining (MRC) diversity receiver, the energy and spectral efficiencies of OFDM-IM system are determined by the number of independent channels between transmitter and receiver.

Available for download on Friday, September 30, 2022

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