Abstract
Orthogonal frequency division multiplexing (OFDM-IM) is a multicarrier transmission technology that modulates information bits not just onto subcarriers by means of M-ary constellation mapping but also onto selected (active) subcarrier indices. Consequently, errors can occur in OFDM-IM systems indices in addition to the errors of M-ary symbols. This paper analyzes the error scenarios and derives mathematical expressions for the error performance based on the maximum likelihood (ML) detection. In evaluating the bit error rate (BER) in the additive white Gaussian noise (AWGN) channel, some assumptions are made and our analytical result show that the BER of OFDM-IM system is a weighted sum of exponential functions and Q-functions. Our general BER expression has been shown to be in excellent agreement with numerical simulation and proven to be accurate and can serve as a reference for the design and evaluation of any arbitrary size and configuration of OFDM-IM systems.
Highlights
OFDM is the most popular multicarrier transmission technology adopted in many recent broadband wireless standards such as 802.11a/g (Wi-Fi), 802.16 (WiMAX), Long Term Evolution (LTE), Digital Audio and Video Broadcasting (DAB and DVB)
If the Orthogonal Frequency Division Multiplexing with Index Modulation’ (OFDM-IM) vectors have equal joint A Priori Probability (AP), which is the case in the example shown in Table (1), the receiver becomes equivalent to the (ML)
Note that most of the OFDM-IM bit error rate (BER) expressions in the literature depend on pair wise error analysis, which usually result in tight performance at high SNR region, our expressions model the closely tight BER performance across the whole SNR region
Summary
MAHMOUD ABDULLAHI 1, AIJUN CAO1, ADNAN ZAFAR 1,2, PEI XIAO 1, (Senior Member, IEEE), AND IBRAHIM A. Engineering and Physical Sciences Research Council under Grant EP/P03456X/1, and in part by the University of Surrey 5GIC (http://www.surrey.ac.uk/5gic) members for this work
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