Abstract
Non-orthogonal multiple access (NOMA) is considered as a promising technique in visible light communication (VLC) systems for performance enhancement. In order to improve the system’s energy efficiency, we carry out transceiver design for an NOMA VLC system. We develop an optimal power allocation scheme for the system based on finite-alphabet inputs, and we propose a joint detection and decoding (JDD) algorithm for signal detection. Comprehensive simulation results demonstrate that our proposed NOMA strategy can achieve significant performance gains over the time division multiple access (TDMA) scheme, and our designed JDD algorithm outperforms the conventional successive interference cancellation (SIC) algorithm for NOMA.
Highlights
As an adjunct or alternative to radio frequency (RF) communications and as a promising technology for 5G systems, visible light communications (VLC) has become a very important area of research [1,2,3,4,5,6,7,8] due to its advantage of low cost, ultra-high bandwidth, freedom from spectral licensing issues, etc.Considering the realistic application, the VLC systems are generally expected to support multiple users, and multiple access strategies are essential for VLC systems
Since different users are allocated orthogonal resources in either the code, time or frequency domain, these methods cannot provide sufficient resource reuse. In contrast to these OMA methods, a novel multiple access strategy called non-orthogonal multiple access (NOMA), which has been proposed as a promising solution for the 5G wireless networks [9,10,11,12], allows multiple users simultaneously to utilize the entire available code, time and frequency resources by multiplexing users in the power domain using superposition coding at the transmitter and successive interference cancellation (SIC) at the receiver
Intended for the optimal power allocation scheme we have proposed in the last subsection, in this subsection, we are committed to developing an efficient demodulation and decoding algorithm
Summary
As an adjunct or alternative to radio frequency (RF) communications and as a promising technology for 5G systems, visible light communications (VLC) has become a very important area of research [1,2,3,4,5,6,7,8] due to its advantage of low cost, ultra-high bandwidth, freedom from spectral licensing issues, etc. Since different users are allocated orthogonal resources in either the code, time or frequency domain, these methods cannot provide sufficient resource reuse In contrast to these OMA methods, a novel multiple access strategy called non-orthogonal multiple access (NOMA), which has been proposed as a promising solution for the 5G wireless networks [9,10,11,12], allows multiple users simultaneously to utilize the entire available code, time and frequency resources by multiplexing users in the power domain using superposition coding at the transmitter and successive interference cancellation (SIC) at the receiver. We develop an optimal power allocation strategy with finite-alphabet inputs for the transmitter and propose a joint detection and decoding (JDD) algorithm for the receiver.
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