Abstract
This paper proposes a 2x2 MIMO OFDM Radio-over-Fiber scheme based on optical subcarrier multiplexing and 60-GHz MIMO wireless transmission. We also schematically investigated the principle of optical subcarrier multiplexing, which is based on a dual-parallel Mach-Zehnder modulator (DP-MZM). In our simulation result, combining two MIMO OFDM signals to drive DP-MZM gives rise to the PAPR augmentation of less than 0.4 dB, which mitigates nonlinear distortion. Moreover, we applied a Levin-Campello bit-loading algorithm to compensate for the uneven frequency responses in the V-band. The resulting system achieves OFDM signal rates of 61.5-Gbits/s with BER of 10(-3) over 25-km SMF transmission followed by 3-m wireless transmission.
Highlights
Increasing demand for high-definition video and interactive on-line services has made it necessary to provide broadband wireless at the multi-Gbits/s rate
We schematically investigated the principle of optical subcarrier multiplexing, which is based on a dual-parallel MachZehnder modulator (DP-MZM)
In our simulation result, combining two MIMO OFDM signals to drive DP-MZM gives rise to the PAPR augmentation of less than 0.4 dB, which mitigates nonlinear distortion
Summary
Increasing demand for high-definition video and interactive on-line services has made it necessary to provide broadband wireless at the multi-Gbits/s rate. Multi-input multi-output (MIMO) technology can improve spectral efficiency by transmitting multiple signals within the same bandwidth. This has led to the widespread adoption of modulation formats with high spectral efficiency and MIMO technology in communication systems. In [2], a direct-detection (DD) RoF system with PDM was presented; polarizing variations of the optical carrier can induce signal fading after the polarization beam splitter (PBS) and photodetector (PD). This paper systematically outlines the concept on which the proposed system is based and evaluates wireless performance at 60 GHz. Using bit-loading technology, the proposed system achieved OFDM signals as high as 61.5-Gbits/s with a bit error rate (BER) below the forward error correction (FEC) threshold of 10−3 over 25-km single-mode fiber (SMF) followed by 3-m wireless transmission
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