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SSBI mitigation at 60GHz OFDM-ROF system based on optimization of training sequence.

Xin Wang1, Jianjun Yu, Zizheng Cao

  • 1Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, School of Information Science and Engineering, Hunan University, Changsha, China.

Optics Express
|June 7, 2011
PubMed
Summary
This summary is machine-generated.

We investigated subcarrier-signal beat interference (SSBI) in 60 GHz OFDM-ROF systems. Real-zero training OFDM frames with interleaving and lower modulation order demonstrated the best performance, minimizing SSBI.

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Area of Science:

  • Wireless communication systems
  • Optical fiber communication
  • Signal processing

Background:

  • Subcarrier-signal beat interference (SSBI) is a significant challenge in 60 GHz orthogonal frequency division multiplexing - radio-over-fiber (OFDM-ROF) systems.
  • SSBI degrades signal quality and limits system performance.

Purpose of the Study:

  • To theoretically and experimentally investigate the impact of SSBI in 60 GHz OFDM-ROF systems.
  • To compare the effectiveness of different OFDM training sequences in mitigating SSBI.

Main Methods:

  • Investigated SSBI effects in 60 GHz OFDM-ROF systems.
  • Compared four OFDM frame types: all-real, all-complex, complex-zero, and real-zero training sequences.
  • Conducted experiments over 20 km of standard single-mode fiber (SMF).

Main Results:

  • Power penalties at a Bit Error Rate (BER) of 1x10(-3) were 2.5 dB (all-real), 5.5 dB (all-complex), 4 dB (complex-zero), and 1 dB (real-zero).
  • The real-zero training OFDM frame with an interleave structure and lower modulation order exhibited the least SSBI.
  • This configuration showed the best overall performance.

Conclusions:

  • The choice of training sequence significantly impacts SSBI mitigation in OFDM-ROF systems.
  • Real-zero training, combined with interleaving and lower modulation orders, is an effective strategy to reduce SSBI.
  • Optimized frame structures are crucial for enhancing the performance of high-frequency radio-over-fiber systems.