Impact Statement:We for the first time propose and investigate a hybrid SDMA/QOMA scheme for MU-UVLC systems. By dividing the closely located users into groups, SDMA is used to support mu...Show More
Abstract:
Due to severe inter-beam interference and high cost of conventional full space division multiple access (SDMA)-based multi-user underwater visible light communication (MU...Show MoreMetadata
Impact Statement:
We for the first time propose and investigate a hybrid SDMA/QOMA scheme for MU-UVLC systems. By dividing the closely located users into groups, SDMA is used to support multiple user groups by configuring the same number of light beams, while QOMA is adopted to serve users with similar channel conditions within each light beam. Simulation and experimental results demonstrate the feasibility and superiority of the proposed hybrid SDMA/QOMA scheme over other benchmark schemes in MU-UVLC systems.
Abstract:
Due to severe inter-beam interference and high cost of conventional full space division multiple access (SDMA)-based multi-user underwater visible light communication (MU-UVLC) systems, partial SDMA has been considered to substantially reduce inter-beam interference and costs by enabling closely located users to share the same light beam. Moreover, non-orthogonal multiple access (NOMA) is generally adopted to multiplex users in the same beam. However, for users with similar channel gains, the use of NOMA may suffer from severe error propagation. To this end, we propose and demonstrate a hybrid SDMA and quasi-orthogonal multiple access (QOMA) scheme for performance enhancement of partial SDMA-based MU-UVLC systems. Simulation and experimental results show that, in two-user UVLC system applying hybrid SDMA/QOMA, the bit error rate (BER) performance of the near user can be substantially improved and a much wider range of effective power allocation ratio can be achieved compared with that using conventional hybrid SDMA/NOMA.
Published in: IEEE Photonics Journal ( Volume: 15, Issue: 4, August 2023)