Towards optimization of 5G NR transport over fiber links performance in 5G Multi-band Networks: An OMSA model approach.

• We propose a 5G NR- multiband for Radio over Fiber link outfitted with an optimized magnitude selective affine (OMSA) method to cover enhanced mobile broadband (eMBB) situations for 2.14 GHz and 10 GHz, correspondingly. • We show experimentally that OMSA further reduces the complexity with better or at least similar performance to that of MSA by using a weighted function as a nonlinear operator to accurately capture the nonlinear behaviour of the system being modelled, which can lead to a reduction in the number of segments and improvement in the accuracy of the model. This means that it will also lead to a reduction in the number of coefficients needed. This helps to make the model more efficient and simpler to use. • The experimental results demonstrate that the OMSA model has lower complexity than the MSA model while achieving a slightly better performance that is assessed in terms of computations, error vector magnitude (EVM) or adjacent channel power ratio (ACPR). The application of analog radio over fiber (A-RoF) systems for 5G new radio (NR) multiband waveforms presents challenges, including nonlinearity introduced by the Mach Zehnder Modulator and the dispersion and attenuation of the optical signal over long fiber lengths. To address these challenges, this paper proposes a new version of the magnitude-selective affine (MSA) model, named the optimized magnitude-selective affine (OMSA) model, which incorporates a power-reliant weighting function to improve performance while reducing complexity via Digital Predistortion (DPD). The OMSA model is tested using 5G NR signals at 10 GHz with 50 MHz and flexible-waveform signals at 2.14 GHz with a 20 MHz bandwidth, transmitted over a 10 km fiber length using a Mach Zehnder Modulator and a 1550 nm optical carrier. The performance of the OMSA model is compared to the MSA and generalized memory polynomial (GMP) models in terms of adjacent channel power ratio, error vector magnitude, and complexity. The results show that the OMSA model outperforms the MSA and GMP models in terms of performance reducing the error vector magnitude to 1.9% as compared to 4% and 3% in case of GMP and MSA respectively. Additionally, in terms of complexity measured via coefficients, OMSA is 168 times more efficient as compared to GMP and offers 1.93 times higher efficiency as compared to MSA while maintaining lower complexity. The experimental demonstration of 5G NR multiband waveforms over A-RoF links using the OMSA model represents a significant step towards the practical implementation of high-performance, low-complexity 5G NR systems over fiber-optic links and provides a promising solution to the challenges associated with DPD linearization for A-RoF systems. [ABSTRACT FROM AUTHOR]