Opportunistic Multi-Layer Transmission over Unknown Channels

Ranjitha Gubbi Suresh, Leif R. Wilhelmsson, Saeedeh Moloudi, Michael Lentmaier

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review


We use the received bit information rate (RBIR) to analyze the performance of multi-layer transmission when combined with hybrid automatic repeat request (HARQ). The different layers are obtained from ordinary Gray-coded M-QAM and used for transmitting log2(M) codewords in parallel, exploiting that the different bits in Gray-coded M-QAM have very different reliability. The performance is analyzed when different layers are decoded in parallel (independently) as well as when successive decoding is used. In addition, we study how the RBIR can be used to select a suitable layer for a retransmission to further improve the performance. Simulation results based on a Wi-Fi like physical layer show that a significant gain compared to the standard approach can be achieved by using basic multilayer transmission, and also that using successive decoding and carefully selecting what layer to use for retransmission can give further gains.

Original languageEnglish
Title of host publication2021 IEEE 93rd Vehicular Technology Conference, VTC 2021-Spring - Proceedings
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728189642
Publication statusPublished - 2021
EventIEEE 93rd Vehicular Technology Conference 2021 - Helsinki, Finland
Duration: 2021 Apr 252021 Apr 28

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252


ConferenceIEEE 93rd Vehicular Technology Conference 2021
Abbreviated titleVTC-Spring 2021
Internet address

Subject classification (UKÄ)

  • Telecommunications

Free keywords

  • HARQ
  • hierarchical modulation
  • multi-layer transmission
  • RBIR
  • successive demodulation
  • Wi-Fi


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