Abstract
The achievable performance of subcarrier-index modulation (SIM) is analyzed in terms of its minimum Euclidean distance, constrained and unconstrained average mutual information, as well as its peak-to-average power ratio (PAPR). Our performance investigations identify the beneficial operating region of the SIM scheme over its conventional orthogonal frequency-division multiplexing (OFDM) counterpart, hence providing general design guidelines for the SIM parameters. More specifically, an SIM scheme is shown to be beneficial for the scenario of a relatively low transmission rate below 2 b/s/Hz. In addition, we demonstrate that the PAPR of the SIM scheme is comparable with that of its OFDM counterpart under the idealized simplifying assumption of having Gaussian input symbols.
Highlights
Orthogonal frequency-division multiplexing (OFDM) [1] has played a key role in numerous communication systems, such as cellular networks, local area networks, television broadcasting and in power line communications
THE bit-error ratio (BER) AND peak-to-average power ratio (PAPR) COMPARISONS IN UNCODED SCENARIOS First, in Figs. 8 and 9 we compared the BERs of the subcarrierindex modulation (SIM) and the conventional OFDM systems, which operated in uncoded scenarios
Based on the derived upper bound of the SIM scheme’s minimum Euclidean distance (MED), we provided design guidelines for the SIM parameters
Summary
Orthogonal frequency-division multiplexing (OFDM) [1] has played a key role in numerous communication systems, such as cellular networks, local area networks, television broadcasting and in power line communications Another appealing broadband concept is constituted by subcarrierindex modulation (SIM) [2]–[16], where not all subcarriers are modulated, the specific legitimate combination of the subcarrier indices of the activated subcarriers carry implicit information. The achievable bit-error ratio (BER) performance of the SIM scheme was evaluated by Abu-Alhiga and Haas [6], motivated by the development of the spatial modulation (SM) scheme [20]–[23], which relies on the index modulation concept applied in the spatial domain It was mentioned by Tsonev et al [8] that the SIM scheme is capable of attaining a lower PAPR than OFDM.
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