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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
Summary
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.
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.
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