No abstract

Balancing theoretical analysis and practical advice, this book describes all the underlying principles required to build high performance indoor optical wireless communication (OWC) systems based on visible and infrared light, alongside essential techniques for optimising systems by maximising throughput, reducing hardware complexity and measuring performance effectively. It provides a comprehensive analysis of information rate-, spectral- and power-efficiencies for single and multi-carrier transmission schemes, and a novel analysis of non-linear signal distortion, enabling the use of off-the-shelf LED technology. Other topics covered include cellular network throughput and coverage, static resource partitioning and dynamic interference-aware scheduling, realistic light propagation modelling, OFDM, optical MIMO transmission and nonlinearity modelling. Covering practical techniques for building indoor optical wireless cellular networks supporting multiple users and guidelines for 5G cellular system studies, in addition to physical layer issues, this is an indispensable resource for academic researchers, professional engineers and graduate students working in optical communications.

No abstract

In this paper, a low-complexity symbol-based equalizer that performs non-linear distortion cancellation is proposed for application at the user terminal in the DVB-S2X satellite forward link. The channel is comprehensively modelled, including the non-linear travelling wave tube amplifier (TWTA) characteristics, the input-multiplexing (IMUX) and output-multiplexing (OMUX) filter responses at the satellite transponder, and the phase noise at the user terminal, according to the very-small aperture terminal (VSAT) reference scenario. Two detectors in the cancellation loop are considered, comparing the packeterror rate (PER) performance of simple maximum likelihood (ML) demodulation with hard decision to soft information exchange with low-density parity-check (LDPC) decoder, and showing only marginal improvement with the latter solution. The PER performance is compared against a number of predistortion techniques at the transmitter, such as dynamic data pre-distortion, successive data pre-distortion, and static data predistortion. The novel receiver demonstrates superior performance even with one iteration of distortion cancellation, while the joint application of successive data pre-distortion and iterative symbol-based equalization shows up to 4.95-dB energy efficiency gain for 32-level amplitude and phase-shift keying (32-APSK). The computational complexity is also evaluated. The improved receiver is particularly suitable for application with higher order modulation, a wide-band carrier, and low roll-off factors.

No abstract