研究目的
To demonstrate the generation and transmission of UF-OFDM signals for 5G millimeter-wave small cell radio access networks, evaluating performance through BER measurements and determining the optimum modulation point.
研究成果
The experimental demonstration achieved a UF-OFDM signal transmission at 60 GHz with a data rate of 3.2 Gbps and a BER of 10^-3 at the optimum driving power of 3 dBm, satisfying the FEC limit. UF-OFDM's high suppression of out-of-band emission and better spectral efficiency make it suitable for future 5G wireless high-data-rate transmission.
研究不足
The setup includes a mixer, RF amplifier, and broadband amplifier that add extra electronics noise, reducing SNR. Amplifiers with better flatness in frequency response could improve results. SNR might be improved by using an analog envelope detector instead of LO and mixer.
1：Experimental Design and Method Selection:
The experiment involves generating UF-OFDM signals using MATLAB for offline processing, transmitting them over an optical fiber system with Mach-Zehnder modulators (MZMs), converting to mm-wave at 60 GHz, and receiving with digital signal processing (DSP) for BER evaluation.
2：Sample Selection and Data Sources:
A data stream of 12288 bits is used, mapped to 16-QAM format.
3：List of Experimental Equipment and Materials:
Includes a DFB laser, MZMs, EDFA, AWG, RF amplifier, photodiode, broadband amplifier, mixer, LO, real-time scope, and MATLAB for DSP.
4：Experimental Procedures and Operational Workflow:
The UF-OFDM signal is generated offline, uploaded to AWG, modulated optically, amplified, converted to mm-wave, down-converted to IF, captured by scope, and processed with DSP for BER calculation.
5：Data Analysis Methods:
BER is measured by direct bit comparison, with equalization using RLS and zero-forcing frequency domain equalization.
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Mach-Zehnder modulator
Modulates optical signals; one MZM is used for optical carrier suppression and another for UF-OFDM signal modulation.
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arbitrary waveform generator
Generates and outputs the UF-OFDM signal for modulation.
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RF amplifier
Amplifies the UF-OFDM signal before applying to the modulator.
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broadband amplifier
Amplifies the mm-wave signal at the receiver.
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photodiode
Converts optical signals to electrical mm-wave signals.
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mixer
Down-converts the mm-wave signal to intermediate frequency.
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real-time scope
Captures the received IF signal for offline DSP processing.
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DFB laser
Provides the optical carrier for modulation.
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EDFA
Amplifies the optical signal to compensate for power loss.
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