研究目的
To investigate an envelope detection scheme for a 16QAM single carrier signal in an IM/DD RoF system at Q-band, enabling down-conversion without a mixer at the user side.
研究成果
The envelope detection scheme successfully enables down-conversion of 16QAM signals in an IM/DD RoF system without a mixer, with acceptable performance over 25km fiber and 2.9m wireless links. Future work could focus on extending wireless range and optimizing for higher data rates.
研究不足
The wireless distance is limited to 2.9 meters due to experimental constraints. The system performance may degrade with higher symbol rates or longer distances, and SSBI can affect signal quality if not properly managed.
1：Experimental Design and Method Selection:
The experiment involves generating a 16QAM signal using an intensity modulator driven by an IF signal, coupling it with a continuous-wavelength lightwave, transmitting over fiber and wireless links, and using an envelope detector for down-conversion. Theoretical analysis based on square-law rule for signal-to-signal beat interference (SSBI) is included.
2：Sample Selection and Data Sources:
The signal is generated using a 24GS/s arbitrary waveform generator (AWG) with offline MATLAB programming for data mapping and filtering. No specific datasets are mentioned; synthetic signals are used.
3：List of Experimental Equipment and Materials:
Includes external cavity lasers (ECLs), intensity modulator (IM), optical coupler (OC), photodiode (PD), electrical amplifiers (EAs), envelope detector (ED), oscilloscope, horn antennas, standard single mode fiber (SSMF), and attenuators.
4：Experimental Procedures and Operational Workflow:
Steps involve generating optical signal, coupling, fiber transmission, photodetection, amplification, wireless transmission, reception, down-conversion with ED, sampling with oscilloscope, and offline processing with MATLAB.
5：Data Analysis Methods:
Performance is evaluated using bit error rate (BER) and error vector magnitude (EVM) metrics, analyzed through offline MATLAB processing.
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external cavity laser
ECL
Generates continuous-wavelength lightwaves for signal sources in the optical system.
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intensity modulator
IM
Modulates the optical signal with the IF 16QAM driving signal.
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optical coupler
OC
Combines optical signals from different sources.
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photodiode
PD
Converts optical signals to electrical signals through heterodyne beating.
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electrical amplifier
EA
Amplifies electrical signals before and after wireless transmission.
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envelope detector
ED
Down-converts the mm-wave signal to intermediate frequency without a mixer.
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oscilloscope
OSC
Samples the IF signal for offline processing.
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horn antenna
Transmits and receives wireless signals at Q-band.
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arbitrary waveform generator
AWG
Generates the driving signal for the intensity modulator.
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standard single mode fiber
SSMF
Transmits optical signals over distances up to 25km.
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attenuator
Controls the received optical power in the system.
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