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Distributed multi-user MIMO transmission using real-time sigma-delta-over-fiber for next generation fronthaul interface

Chia-Yi Wu (UGent) , Haolin Li (UGent) , Olivier Caytan (UGent) , Joris Van Kerrebrouck (UGent) , Laurens Breyne (UGent) , Johan Bauwelinck (UGent) , Piet Demeester (UGent) and Guy Torfs (UGent)
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  • ATTO (A new concept for ultra-high capacity wireless networks.)
Abstract
To achieve the massive device connectivity and high data rate demanded by 5G, wireless transmission with wider signal bandwidths and higher-order multiple-input multiple-output (MIMO) is inevitable. This work demonstrates a possible function split option for the next generation fronthaul interface (NGFI). The proof-of-concept downlink architecture consists of real-time sigma-delta modulated signal over fiber (SDoF) links in combination with distributed multi-user (MU) MIMO transmission. The setup is fully implemented using off-the-shelf and in-house developed components. A single SDoF link achieves an error vector magnitude (EVM) of 3.14% for a 163.84 MHz-bandwidth 256-QAM OFDM signal (958.64 Mbps) with a carrier frequency around 3.5 GHz transmitted over 100 m OM4 multi-mode fiber at 850 nm using a commercial QSFP module. The centralized architecture of the proposed setup introduces no frequency asynchronism among remote radio units. For most cases, the 2 x 2 MU-MIMO transmission has little performance degradation compared to SISO, 0.8 dB EVM degradation for 40.96 MHz-bandwidth signals and 1.4 dB for 163.84 MHz-bandwidth on average, implying that the wireless spectral efficiency almost doubles by exploiting spatial multiplexing. A 1.4 Gbps data rate (720 Mbps per user, 163.84 MHz-bandwidth, 64-QAM) is reached with an average EVM of 6.66%. The performance shows that this approach is feasible for the high-capacity hot-spot scenario.
Keywords
PERFORMANCE, FREQUENCY, DIVERSITY, ANTENNA, RAN, OFDM, MIMO communication, Training, Sigma-delta modulation, Baseband, Bandwidth, Radio frequency, Distributed antenna system, multi-user, multiple-input multiple-output, next generation fronthaul interface, radio-over-fiber, sigma-delta modulation

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Citation

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MLA
Wu, Chia-Yi, et al. “Distributed Multi-User MIMO Transmission Using Real-Time Sigma-Delta-over-Fiber for next Generation Fronthaul Interface.” JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 38, no. 4, 2020, pp. 705–13.
APA
Wu, C.-Y., Li, H., Caytan, O., Van Kerrebrouck, J., Breyne, L., Bauwelinck, J., … Torfs, G. (2020). Distributed multi-user MIMO transmission using real-time sigma-delta-over-fiber for next generation fronthaul interface. JOURNAL OF LIGHTWAVE TECHNOLOGY, 38(4), 705–713.
Chicago author-date
Wu, Chia-Yi, Haolin Li, Olivier Caytan, Joris Van Kerrebrouck, Laurens Breyne, Johan Bauwelinck, Piet Demeester, and Guy Torfs. 2020. “Distributed Multi-User MIMO Transmission Using Real-Time Sigma-Delta-over-Fiber for next Generation Fronthaul Interface.” JOURNAL OF LIGHTWAVE TECHNOLOGY 38 (4): 705–13.
Chicago author-date (all authors)
Wu, Chia-Yi, Haolin Li, Olivier Caytan, Joris Van Kerrebrouck, Laurens Breyne, Johan Bauwelinck, Piet Demeester, and Guy Torfs. 2020. “Distributed Multi-User MIMO Transmission Using Real-Time Sigma-Delta-over-Fiber for next Generation Fronthaul Interface.” JOURNAL OF LIGHTWAVE TECHNOLOGY 38 (4): 705–713.
Vancouver
1.
Wu C-Y, Li H, Caytan O, Van Kerrebrouck J, Breyne L, Bauwelinck J, et al. Distributed multi-user MIMO transmission using real-time sigma-delta-over-fiber for next generation fronthaul interface. JOURNAL OF LIGHTWAVE TECHNOLOGY. 2020;38(4):705–13.
IEEE
[1]
C.-Y. Wu et al., “Distributed multi-user MIMO transmission using real-time sigma-delta-over-fiber for next generation fronthaul interface,” JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 38, no. 4, pp. 705–713, 2020.
@article{8657348,
  abstract     = {{To achieve the massive device connectivity and high data rate demanded by 5G, wireless transmission with wider signal bandwidths and higher-order multiple-input multiple-output (MIMO) is inevitable. This work demonstrates a possible function split option for the next generation fronthaul interface (NGFI). The proof-of-concept downlink architecture consists of real-time sigma-delta modulated signal over fiber (SDoF) links in combination with distributed multi-user (MU) MIMO transmission. The setup is fully implemented using off-the-shelf and in-house developed components. A single SDoF link achieves an error vector magnitude (EVM) of 3.14% for a 163.84 MHz-bandwidth 256-QAM OFDM signal (958.64 Mbps) with a carrier frequency around 3.5 GHz transmitted over 100 m OM4 multi-mode fiber at 850 nm using a commercial QSFP module. The centralized architecture of the proposed setup introduces no frequency asynchronism among remote radio units. For most cases, the 2 x 2 MU-MIMO transmission has little performance degradation compared to SISO, 0.8 dB EVM degradation for 40.96 MHz-bandwidth signals and 1.4 dB for 163.84 MHz-bandwidth on average, implying that the wireless spectral efficiency almost doubles by exploiting spatial multiplexing. A 1.4 Gbps data rate (720 Mbps per user, 163.84 MHz-bandwidth, 64-QAM) is reached with an average EVM of 6.66%. The performance shows that this approach is feasible for the high-capacity hot-spot scenario.}},
  author       = {{Wu, Chia-Yi and Li, Haolin and Caytan, Olivier and Van Kerrebrouck, Joris and Breyne, Laurens and Bauwelinck, Johan and Demeester, Piet and Torfs, Guy}},
  issn         = {{0733-8724}},
  journal      = {{JOURNAL OF LIGHTWAVE TECHNOLOGY}},
  keywords     = {{PERFORMANCE,FREQUENCY,DIVERSITY,ANTENNA,RAN,OFDM,MIMO communication,Training,Sigma-delta modulation,Baseband,Bandwidth,Radio frequency,Distributed antenna system,multi-user,multiple-input multiple-output,next generation fronthaul interface,radio-over-fiber,sigma-delta modulation}},
  language     = {{eng}},
  number       = {{4}},
  pages        = {{705--713}},
  title        = {{Distributed multi-user MIMO transmission using real-time sigma-delta-over-fiber for next generation fronthaul interface}},
  url          = {{http://dx.doi.org/10.1109/JLT.2019.2947786}},
  volume       = {{38}},
  year         = {{2020}},
}

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