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Radio-over-fibre transmission of multi-carrier 64-QAM radio signal at 18 GHz

Radio-over-fibre transmission of multi-carrier 64-QAM radio signal at 18 GHz. Hejie Yang , Maria Garcia Larrode, Gert-Jan Rijckenberg, Eduward Tangdiongga and A.M.J. Koonen Electro-optics communication group COBRA Institute Eindhoven University of Technology. Higher radio frequency .

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Radio-over-fibre transmission of multi-carrier 64-QAM radio signal at 18 GHz

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  1. Radio-over-fibre transmission of multi-carrier 64-QAM radio signal at 18 GHz Hejie Yang, Maria Garcia Larrode, Gert-Jan Rijckenberg, Eduward Tangdiongga and A.M.J. Koonen Electro-optics communication group COBRA Institute Eindhoven University of Technology Hejie Yang – BroadBand Europe, Dec, 2007

  2. Higher radio frequency Smaller cell size More antenna, even more expensive! Motivation: Why radio-over-fibre? Current problem? Growing traffic volume Hejie Yang – BroadBand Europe, Dec, 2007

  3. Motivation: Why radio-over-fibre? Future wireless access network employing radio-over-fibre techniques in home: Move radio processing to the central office, simplify the radio access unit (RAU) Central office: possible to process multi-standard signal, and support multiple RAUs Hejie Yang – BroadBand Europe, Dec, 2007

  4. Outline: • Motivation: Why radio-over-fibre? • Introduction to radio-over-fibre (RoF) techniques • RoF system using optical frequency multiplication (OFM) • Transmission of multi-carrier signal using OFM • Conclusion Hejie Yang – BroadBand Europe, Dec, 2007

  5. Introduction to radio-over-fibre (RoF) techniques Required services: GSM (900/1800 MHz), UMTS (2 GHz), WiFi (2.4 GHz), WiMAX (10-66 GHz), UWB (3.6-10 GHz), etc … • RoF transmission techniques: • Direct modulation of Laser source (simple, cost-low, low-frequency) • Heterodyning two optical signals to generate microwave signal (high frequency, phase locking needed, complex) • Frequency up-conversion by operating Mach-Zehnder modulator at null-point. (require high frequency electronics) Proposed optical frequency multiplication (OFM): dispersion-tolerant, low-cost and effective (no LO, no high frequency electronics) Hejie Yang – BroadBand Europe, Dec, 2007

  6. RoF system using OFM • - flexible when choosing output RF frequency  multi-standard system • low frequency electronics  low-cost solution • very pure RF carrier (<100 Hz)  good performance • dispersion tolerant where n is the order of harmonics generated by frequency sweeping Hejie Yang – BroadBand Europe, Dec, 2007

  7. Outline: • Motivation: Why radio-over-fibre? • Introduction to radio-over-fibre (RoF) • RoF system using optical frequency multiplication (OFM) • Transmission of multi-carrier signal using OFM • Conclusion Hejie Yang – BroadBand Europe, Dec, 2007

  8. e.g. WiMAX standard, OFDM and OFDMA with up to 2048 sub-carriers, 100 Mbit/s and beyond 10 GHz… P f Over 4.4 km MMF, different number of sub-carriers are investigated, each sub-carrier is modulated by 64-QAM. (silica 50um, GI-MMF) Transmission of multi-carrier signal using OFM (1) • Trends of wireless access network: • high frequency • high data rate • - multi-carrier format Hejie Yang – BroadBand Europe, Dec, 2007

  9. Transmission of multi-carrier signal using OFM (2) For a fixed total symbol rate (18 and 9 MS/s), number of carriers varies from 1, 3, 5, 10 Total bit rate can achieved 108 Mbit/s with EVM value below 3.4 % better performance compared with single carrier, due to decreased symbol rate per carrier EVM: error vector magnitude, smaller EVM corresponds to larger SNR Hejie Yang – BroadBand Europe, Dec, 2007

  10. Transmission of multi-carrier signal using OFM (3) For a fixed total symbol rate 18 MS/s: a trade-off between number of carriers and symbol rate per carrier can be observed total symbol rate (18 MS/s) = number of carriers x symbol rate per carrier Hejie Yang – BroadBand Europe, Dec, 2007

  11. Transmission of multi-carrier signal using OFM (4) For the same NC: increasing of SR  larger EVM. (because of the wider spectral bandwidth) For the same SR: increasing of NC  larger EVM (because of more cross-talk interference between carriers) (dispersion robust..) Hejie Yang – BroadBand Europe, Dec, 2007

  12. System performance doesn’t depend on number of carriers in this case Transmission of multi-carrier signal using OFM (5) EVM versus totalsymbol rate, for different number of carriers approx. linear relation 210 Mbit/s achieved when EVM < 6% (7.94% for 64-QAM in WiFi standard) Hejie Yang – BroadBand Europe, Dec, 2007

  13. Conclusion • feasibility of transmitting multi-carrier 64-QAM signal at 18.3 GHz over 4.4 km MMF has been demonstrated • more than 210 Mbit/s QAM data is transmitted while keeping the EVM value within the standard range (<6%) • trade-off between number of carrier and symbol rate per carrier • system performance does not depend on number of carriers, if the total symbol rate is investigated, therefore give rise to more possibilities of system design. Hejie Yang – BroadBand Europe, Dec, 2007

  14. Q & A … Thank you for your attention! Acknowledge for MUSE projectand IOP GenCom! Hejie Yang – BroadBand Europe, Dec, 2007

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