研究目的
Investigating the development of novel spectrally-efficient subband index techniques for multiband carrierless amplitude and phase modulation (m-CAP) to improve the power/spectral efficiency of conventional m-CAP in short range optical data links using step-index plastic optical fibre (SI-POF).
研究成果
The proposed subband index schemes significantly improve the power/spectral efficiency of the conventional m-CAP in short range optical data links, offering design flexibility and superior performance. The low complexity detector (LCD) achieves maximum likelihood solution with linear complexity, making the benefits of the subband index schemes accessible without much increase in system complexity.
研究不足
The complexity of the subband index schemes increases with the constellation size, potentially limiting their application for very large constellation sizes without further optimization.
1：Experimental Design and Method Selection:
The study involves the development of subband index (SI) techniques for m-CAP, including enhanced SI-CAP (eSI-CAP) that employs a dual constellation to improve spectral efficiency. A low complexity detector (LCD) achieving maximum likelihood solution is developed for the subband index schemes.
2：Sample Selection and Data Sources:
Experimental demonstrations are performed in a short range optical data link using step-index plastic optical fibre (SI-POF).
3：List of Experimental Equipment and Materials:
Equipment includes an arbitrary waveform generator (AWG, Agilent 33600 series), LED driver, resonant-cavity LED, SI-POF (HFBR-RUD500Z), PIN-based photo-receiver (PDA10A), and a digital oscilloscope (Agilent 7000B Series).
4：Experimental Procedures and Operational Workflow:
Signals corresponding to each scheme are generated on a computer, sent to an AWG, fed to an LED driver with added DC bias, used to modulate the intensity of the LED, transmitted through SI-POF, received by a photo-receiver, and captured by a digital oscilloscope for offline post-detection processing.
5：Data Analysis Methods:
The performance is evaluated based on bit error rate (BER) and spectral efficiency, defined as the bit rate divided by the link's 3 dB bandwidth.
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