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Related Experiment Video

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Soft Pneumatic Robot Modulates Graph Theory Metrics of Brain Network for Hand Rehabilitation After Stroke
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OFDM with Index Modulation for Asynchronous mMTC Networks.

Seda Doğan1, Armed Tusha2, Hüseyin Arslan3,4

  • 1Department of Electrical and Electronics Engineering, Istanbul Medipol University, 34810 Istanbul, Turkey. sdogan@st.medipol.edu.tr.

Sensors (Basel, Switzerland)
|April 26, 2018
PubMed
Summary

Orthogonal Frequency Division Multiplexing with index modulation (OFDM-IM) addresses interference in asynchronous machine-type communications. A new Inner Subcarrier Activation scheme improves performance by prioritizing inner subcarriers for data transmission.

Keywords:
OFDM with Index Modulation (OFDM-IM)Orthogonal Frequency Division Multiplexing (OFDM)asynchronous transmissionmassive Machine-Type Communication (mMTC)

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Area of Science:

  • Wireless Communication Systems
  • Signal Processing

Background:

  • Next-generation wireless systems require massive Machine-Type Communications (mMTC).
  • Asynchronous transmissions in mMTC cause Inter-Carrier Interference (ICI) in Orthogonal Frequency Division Multiplexing (OFDM).
  • This interference challenges the provision of services to uncoordinated machine users.

Purpose of the Study:

  • To propose OFDM with index modulation (OFDM-IM) as a solution for mitigating ICI in asynchronous mMTC networks.
  • To introduce a novel subcarrier mapping scheme (SMS) called Inner Subcarrier Activation (ISA) to reduce adjacent user interference.

Main Methods:

  • OFDM-IM utilizes both modulated subcarriers and active subcarrier indices for data transmission.
  • Fractional subcarrier activation in OFDM-IM inherently reduces ICI compared to classical OFDM.
  • The proposed ISA scheme prioritizes activation of inner subcarriers to minimize inter-user interference.

Main Results:

  • OFDM-IM effectively alleviates ICI caused by asynchronous transmissions.
  • The proposed ISA scheme demonstrates superior performance in reducing inter-user interference compared to existing schemes.
  • Theoretical analysis and simulations validate the effectiveness of ISA in asynchronous OFDM-IM systems.

Conclusions:

  • OFDM-IM is a promising technology for handling asynchronous mMTC.
  • The Inner Subcarrier Activation scheme offers significant improvements for interference management in these systems.
  • The proposed ISA enhances the reliability and efficiency of wireless communication for mMTC applications.