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BIA Transmission in Rate Splitting-based Optical Wireless Networks

Ahmad Adnan Qidan, Khulood Alazwary, Taisir El-Gorashi, Majid Safari, Harald Haas, Richard V. Penty, Ian H. White, Jaafar M. H. Elmirghani

TL;DR

A novel strategy is derived, referred to as blind interference alignment-rate splitting (BIA-RS), to fully coordinate the transmission among the optical APs, while determining the precoding matrices of multiple groups of users formed beforehand, which can be implemented within each group to manage MUI.

Abstract

Optical wireless communication (OWC) has recently received massive interest as a new technology that can support the enormous data traffic increasing on daily basis. In particular, laser-based OWC networks can provide terabits per second (Tbps) aggregate data rates. However, the emerging OWC networks require a high number of optical access points (APs), each AP corresponding to an optical cell, to provide uniform coverage for multiple users. Therefore, inter-cell interference (ICI) and multi-user interference (MUI) are crucial issues that must be managed efficiently to provide high spectral efficiency. In radio frequency (RF) networks, rate splitting (RS) is proposed as a transmission scheme to serve multiple users simultaneously following a certain strategy. It was shown that RS provides high data rates compared to orthogonal and non-orthogonal interference management schemes. Considering the high density of OWC networks, the application of RS within each optical cell might not be practical due to severe ICI. In this paper, a new strategy is derived referred to as blind interference alignment-rate splitting (BIA-RS) to fully coordinate the transmission among the optical APs, while determining the precoding matrices of multiple groups of users formed beforehand. Therefore, RS can be implemented within each group to manage MUI. The proposed BIA-RS scheme requires two layers of power allocation to achieve high performance. Given that, a max-min fractional optimization problem is formulated to optimally distribute the power budget among the groups and the messages intended to the users of each group. Finally, a power allocation algorithm is designed with multiple Lagrangian multipliers to provide practical and sub-optimal solutions. The results show the high performance of the proposed scheme compared to other counterpart schemes.

BIA Transmission in Rate Splitting-based Optical Wireless Networks

TL;DR

A novel strategy is derived, referred to as blind interference alignment-rate splitting (BIA-RS), to fully coordinate the transmission among the optical APs, while determining the precoding matrices of multiple groups of users formed beforehand, which can be implemented within each group to manage MUI.

Abstract

Optical wireless communication (OWC) has recently received massive interest as a new technology that can support the enormous data traffic increasing on daily basis. In particular, laser-based OWC networks can provide terabits per second (Tbps) aggregate data rates. However, the emerging OWC networks require a high number of optical access points (APs), each AP corresponding to an optical cell, to provide uniform coverage for multiple users. Therefore, inter-cell interference (ICI) and multi-user interference (MUI) are crucial issues that must be managed efficiently to provide high spectral efficiency. In radio frequency (RF) networks, rate splitting (RS) is proposed as a transmission scheme to serve multiple users simultaneously following a certain strategy. It was shown that RS provides high data rates compared to orthogonal and non-orthogonal interference management schemes. Considering the high density of OWC networks, the application of RS within each optical cell might not be practical due to severe ICI. In this paper, a new strategy is derived referred to as blind interference alignment-rate splitting (BIA-RS) to fully coordinate the transmission among the optical APs, while determining the precoding matrices of multiple groups of users formed beforehand. Therefore, RS can be implemented within each group to manage MUI. The proposed BIA-RS scheme requires two layers of power allocation to achieve high performance. Given that, a max-min fractional optimization problem is formulated to optimally distribute the power budget among the groups and the messages intended to the users of each group. Finally, a power allocation algorithm is designed with multiple Lagrangian multipliers to provide practical and sub-optimal solutions. The results show the high performance of the proposed scheme compared to other counterpart schemes.

Paper Structure

This paper contains 16 sections, 32 equations, 8 figures, 1 table.

Table of Contents

  1. Introduction
  2. Related Works
  3. Main contributions
  4. System Model
  5. Transmitter and receiver
  6. Eye safety
  7. A Novel Rate Splitting-based Interference Management Scheme
  8. Motivational example of BIA-RS
  9. General framework of BIA-RS
  10. Power Allocation in BIA-RS transmission
  11. Problem formulation
  12. Sub-optimal solution
  13. Optimality at $\beta^{[k]}_{g}$ and $\nu_{g}$ values
  14. Optimality at $\lambda_{g}$ and $\xi_{g}$ values
  15. performance evaluation
  16. ...and 1 more sections

Figures (8)

  • Figure 1: An OWC network composed of a number of optical APs serving multiple users.
  • Figure 2: An OWC use case where $L=2$ APs serving $G=2$ groups, each group $g$ with $K_{g}=2$ users. The users of each group receive the same signal.
  • Figure 3: The sum rate of the proposed BIA-RS scheme after power allocation under different constraints. SNR= 30 dB and $K=20$.
  • Figure 4: The sum rate of the proposed BIA-RS scheme versus SNR compared with benchmark schemes. $K=20$.
  • Figure 5: The sum rate of the proposed BIA-RS scheme versus $K$ users compared with benchmark schemes.
  • ...and 3 more figures