Abstract
We propose a modulation-based adaptive power allocation (MBAPA) technique for nonlinear distortion mitigation in intermediate frequency over fiber (IFoF) systems. The technique allocates the spectral power of each IF band according to the required signal-to-noise power ratio (SNR) of the modulation format. To demonstrate the performance of the technique, transmission experiments were performed in 10 km and 20 km with 24-IF bands using OFDM signals. The feasibility of the proposed MBAPA technique was experimentally verified by reducing inter-modulation distortion (IMD) power and enhancing channel linearity.
Highlights
Since the common public radio interface (CPRI) signal is converted to the orthogonal frequency-division multiplexing (OFDM) signal at Because of using an analog signal in intermediate frequency over fiber (IFoF) transmission, the power of the nonlinear component affected by the signal power can be considered as the main distortion, and the generated intermodulation distortion (IMD) is amplified without being removed from the radio units (RU) stage, which can continuously affect the signal distortion
The signal spectral power was allocated for each IF band according to modulation order, which is dependent on the required signal-to-noise power ratio (SNR), the RU,can thebe noise is not considered the mobile fronthaul network (MFN)
In MFN using CPRI, the signal modulation format is determined by the signal degradation by the wireless channel between RU-Device and the fixed additive white gaussian noise (AWGN) in the entire channel, and the signal power is allocated by the water-pouring algorithm as shown in Figure 3 [17]
Summary
Fiber Transmission Using ModulationBased Adaptive Power Allocation. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Since the CPRI signal is converted to the OFDM signal at Because of using an analog signal in IFoF transmission, the power of the nonlinear component affected by the signal power can be considered as the main distortion, and the generated IMD is amplified without being removed from the RU stage, which can continuously affect the signal distortion. The signal spectral power was allocated for each IF band according to modulation order, which is dependent on the required signal-to-noise power ratio (SNR), the RU,can thebe noise is not considered the MFN using CPRI, and the transmitted which converted from the error in vector magnitude (EVM). EVM can be considered as the main distortion, and the generated is amplified without of the received signal This technique was briefly proposed at the Asian communication being removed from the RU stage, which can continuously affect the signal distortion. WeAdaptive propose aPower spectral power allocation technique dependent on the
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