CD-Aware Precoder Based on the Sparse ZC Sequence for OFDM-NOMA-PON

Emerging reconfigurable point-to-multipoint fronthaul architecture requires a dynamic connection between optical network units and multiple optical line terminals and joint optimization between the optical and mobile wireless ends, resulting in rapidly time-varying channel state information (CSI). T...

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Vydáno v:IEEE photonics technology letters Ročník 38; číslo 1; s. 13 - 16
Hlavní autoři: Wang, Geyang, Chen, Lian-Kuan
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.01.2026
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Complexity
Frequency division multiplexing
NOMA
non-orthogonal multiple access (NOMA)
Nonorthogonal multiple access
OFDM
Optical attenuators
optical communication
Optical feedback
Optical network units
Optimization
Orthogonal Frequency Division Multiplexing
Orthogonal frequency division multiplexing (OFDM)
passive optical network (PON)
Passive optical networks
Precoding
Signal to noise ratio
ISSN:1041-1135, 1941-0174
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Shrnutí:Emerging reconfigurable point-to-multipoint fronthaul architecture requires a dynamic connection between optical network units and multiple optical line terminals and joint optimization between the optical and mobile wireless ends, resulting in rapidly time-varying channel state information (CSI). Traditional schemes such as adaptive bit and power loading techniques relying on periodic CSI updating thus become prohibitively complex. Channel-independent precoding schemes, designed to circumvent CSI feedback, offer simpler alternatives; however, their effectiveness deteriorates significantly under chromatic dispersion (CD)-induced spectral nulls in intensity-modulation direct-detection passive optical networks (PONs) systems. To address these limitations, we propose a low-complexity, CD-aware precoding technique based on sparse Zadoff-Chu (SZC) sequences for orthogonal frequency division multiplexing (OFDM)-based non-orthogonal multiple access (NOMA) PON. The SZC scheme not only achieves a flatter SNR profile compared to conventional precodings but also eliminates complex subcarrier-level optimizations. Experimental demonstrations confirm data rates of ~50 and ~70 Gbit/s over 20-km transmission, achieving receiver sensitivity improvements of ~4 dB and ~2 dB over the conventional OFDM-PON and the optimized alternative schemes in the 70-Gbit/s system, respectively.
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ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2025.3614380