NDLI: Hybrid trellis coded modulation (HTCM) for visible light communications

Content Provider	IET Digital Library
Author	Ndjiongue, Alain Richard Ferreira, Hendrik C.
Abstract	The radio frequency spectrum has become very congested and scarce. A response to this dilemma is the implementation of visible light communications (VLC) technology, which is enabled by the dramatic development of light emitting diodes (LEDs) and laser diodes (LDs). VLC has become the most popular emerging telecommunication technology. This is due to the interesting advantages that it provides, which include an unlicensed and large bandwidth, a high throughput capability and a low implementation cost. VLC needs a pivot network in medium and long distance transmissions. The amplify-and-forward scenario between the backbone network and VLC is cost-effective owing to its simplicity when compared to the decode-and-forward scenario. MPSK-CSK is a typical example of cascaded systems in AF scenario with VLC where the backbone channel utilises PSK to convey the message. In this paper, we investigate a forward error correction scheme for cascaded MPSK-CSK systems. A convolutional encoder is added to the MPSK-CSK scheme to construct the hybrid trellis coded modulation scheme. Selected 8HTCM systems using set partitioning are investigated and results for a Gaussian channel are presented. Numerical results reveal that 8HTCM achieves up to 2.129 dB of asymptotic coding gain when compared to the corresponding un-coded MPSK-CSK system.
Starting Page	85
Ending Page	92
Page Count	8
ISSN	17518628
Volume Number	13
e-ISSN	17518636
Issue Number	Issue 1, Jan (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/13/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2018.5324
Journal	IET Communications
Publisher Date	2018-10-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AF Scenario Amplify And Forward Communication Amplify-and-forward Scenario Asymptotic Coding Gain Backbone Channel Backbone Network Cascaded MPSK–CSK System Code Convolutional Codes Convolutional Encoder Decode And Forward Communication Decode-and-forward Scenario Forward Error Correction Forward Error Correction Scheme Free Space Optical Communication Free Space Optical Link Gaussian Channel High-throughput Capability HTCM Hybrid Trellis Coded Modulation Scheme Laser Diode Light Emitting Diode Long-distance Transmissions Low-implementation Cost M-aray Phase-shift-keying–colour-shift-keying Mapping Medium-distance Transmissions Phase Shift Keying Pivot Network Radio Frequency Spectrum Radio Spectrum Management Selected 8HTCM System Semiconductor Laser Set Partitioning Telecommunication Technology Trellis Coded Modulation Uncoded MPSK–CSK System Visible Light Communication Technology VLC
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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