研究目的
Investigating the transmission performance in hybrid fronthaul networks by taking into account SDN-enabled cross-layer resource allocation.
研究成果
The proposed SDN-enabled physical-layer adaptation scheme based on improved PAM-3 for supporting hybrid transceivers in optical C-RANs shows improved pre-FEC and post-FEC BER by 0.6 dB using coherent detection and less than 0.1 dB loss with direct detection compared to OOK and typical PAM-3 formats.
研究不足
The study is limited by the experimental setup's specific conditions, such as the use of a 25 Gbaud sampling rate and the particular LDPC codes employed. The transient noise in direct detection and the need for higher sampling rates in certain scenarios are also noted as challenges.
1：Experimental Design and Method Selection:
The study involves implementing an SDN-enabled adaptive resource allocation framework for mobile fronthaul networks using both CD and DD technologies. Phase-coded PAM-3 is proposed for multicast traffic delivery.
2：Sample Selection and Data Sources:
The experimental setup includes four 10 kHz-linewidth, continuous-wave, tunable sources and employs two LDPC codes for adaptive encoding.
3：List of Experimental Equipment and Materials:
Equipment includes Mach-Zehnder modulators, a 25 Gbaud sampling rate arbitrary waveform generator, variable optical attenuator (VOA), and direct detectors.
4：Experimental Procedures and Operational Workflow:
The setup involves generating PAM signals, attenuating ASE noise, and detecting signals simultaneously by receivers.
5：Data Analysis Methods:
The performance is evaluated based on pre-FEC and post-FEC BER under different modulation formats.
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