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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
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Windowed Joint Detection and Decoding with IR-HARQ for Asynchronous SCMA Systems.

Mengsheng Guan1, Min Zhu1,2, Baoming Bai1

  • 1The State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China.

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Summary
This summary is machine-generated.

This study introduces a new windowed joint detection and decoding algorithm to enhance asynchronous Sparse Code Multiple Access (SCMA) systems. The proposed method improves decoding performance and system throughput over Additive White Gaussian Noise (AWGN) channels.

Keywords:
IR-HARQRC-LDPCSCMAwindowed joint detection and decoding

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Area of Science:

  • Wireless communication systems
  • Information theory
  • Signal processing

Background:

  • Asynchronous Sparse Code Multiple Access (SCMA) systems face challenges in decoding performance over Additive White Gaussian Noise (AWGN) channels.
  • Existing hybrid automatic repeat quest (HARQ) schemes with joint detection and decoding require improvement for efficiency.

Purpose of the Study:

  • To propose a novel windowed joint detection and decoding algorithm for rate-compatible (RC), LDPC code-based, incremental redundancy (IR) HARQ schemes in SCMA systems.
  • To enhance the decoding performance and overall throughput of asynchronous SCMA systems.

Main Methods:

  • Development of a windowed joint detection and decoding algorithm that facilitates iterative information exchange between decoders and previous detectors.
  • Implementation of this algorithm within a rate-compatible, LDPC code-based, incremental redundancy HARQ scheme.
  • Performance evaluation through simulations on asynchronous SCMA systems over AWGN channels.

Main Results:

  • The proposed sliding-window IR-HARQ scheme significantly outperforms the original IR-HARQ scheme in SCMA systems.
  • The windowed joint detection and decoding algorithm demonstrates superior decoding performance compared to existing methods.
  • An improvement in the overall throughput of the SCMA system is observed with the proposed IR-HARQ scheme.

Conclusions:

  • The novel windowed joint detection and decoding algorithm effectively enhances the performance of asynchronous SCMA systems.
  • The proposed IR-HARQ scheme offers a promising solution for improving decoding efficiency and system throughput in wireless communications.