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A Novel Expectation-Maximization-Based Blind Receiver for Low-Complexity Uplink STLC-NOMA Systems.

Ki-Hun Lee1, Bang Chul Jung1

  • 1Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea.

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Summary
This summary is machine-generated.

This study introduces a low-complexity space-time line coded non-orthogonal multiple access (STLC-NOMA) system for Internet-of-things (IoT) networks. The novel system achieves better bit-error-rate (BER) performance with reduced computational complexity.

Keywords:
Gaussian mixture model (GMM)Internet-of-things (IoT)amplitude-shift keying (ASK)blind decoderclusteringexpectation-maximization (EM)low-complexity transceiverspace-time line code (STLC)uplink non-orthogonal multiple access (NOMA)

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Area of Science:

  • Wireless Communication
  • Signal Processing
  • Internet of Things (IoT)

Background:

  • Non-orthogonal multiple access (NOMA) is crucial for enhancing spectral efficiency in wireless networks.
  • Existing space-time line coded NOMA (STLC-NOMA) systems face challenges with high receiver complexity.
  • Internet-of-things (IoT) networks require efficient and low-complexity communication solutions.

Purpose of the Study:

  • To propose a novel, low-complexity STLC-NOMA system for uplink IoT networks.
  • To reduce the computational complexity at the access point (AP) for decoding signals.
  • To analyze the bit-error-rate (BER) performance and develop an efficient blind energy estimation (BEE) algorithm.

Main Methods:

  • Utilizing amplitude-shift keying (ASK) modulators with symbols aligned to in-phase and quadrature axes.
  • Employing space-time line coding (STLC) to compensate for phase distortion.
  • Implementing a single-user maximum-likelihood (ML) detector at the AP.
  • Developing an expectation-maximization (EM)-based blind energy estimation (BEE) algorithm for power and channel gain estimation.

Main Results:

  • The proposed system achieves lower computational complexity compared to conventional STLC-NOMA.
  • Mathematical analysis confirms the exact BER performance of the novel system.
  • The EM-based BEE algorithm effectively estimates transmit power and channel gain, even in short-packet scenarios.
  • The proposed architecture demonstrates superior BER performance, particularly with high-order modulation.

Conclusions:

  • The novel uplink STLC-NOMA system offers a significant reduction in receiver complexity.
  • The system provides improved BER performance over conventional STLC-NOMA.
  • The developed BEE algorithm enhances system efficiency by eliminating the need for pilot signals.