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Digital Mobile Fronthaul Based on Adaptive Differential Pulse Code Modulation
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DOI：10.1109/JLT.2024.3522462.png)
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Abstract
En 中文
A novel signal quantization scheme based on adaptive differential pulse code modulation (ADPCM) is proposed and experimentally demonstrated. By adaptively adjusting the quantization step size using a small number of quantization bits (QBs), the spectral efficiency (SE) can be improved by a factor of 3 similar to 5 while maintaining a high signal-to-quantization-noise ratio (SQNR), compared to the methods based on PCM and DPCM used in Common Public Radio Interface (CPRI)/ enhanced CPRI (eCPRI) architectures. A proof-of-concept experiment is conducted to verify the feasibility. After applying 3-bit and 4-bit quantization to an OFDM RF signal at 5 GHz with a bandwidth of 500 MHz, the resulting SQNR are 24.9 dB and 30.81 dB, respectively. Compared to PCM and DPCM methods, the ADPCM 3-bit and 4-bit schemes provide 14 dB and 7.5 dB improvements in SQNR, respectively. The bitstream generated by the ADPCM 3-bit and 4-bit quantization schemes are transmitted 10 km using 4-level Pulse Amplitude Modulation (PAM4) with intensity modulation/direct detection (IM/DD), and then transmitted over 2m via RF wireless transmission. Additionally, the flexibility of the proposed scheme is also evaluated.
Keywords:
Quantization (signal)
Radio frequency
Pulse modulation
Optical filters
Encoding
Band-pass filters
RF signals
Optical pulses
OFDM
Codes
Adaptive differential pulse-code modulation (ADPCM)
digital radio-over-fiber (DRoF)
high-fidelity quantization
mobile fronthaul
spectral efficiency (SE)
Journal
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4.8
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Citations:
3.8W