KEYWORDS: Receivers, Radio over Fiber, Signal detection, Heterodyning, Hybrid fiber radio, Frequency conversion, Phase shift keying, Digital signal processing, Forward error correction, Signal to noise ratio
The effects of in-phase/quadrature-phase (IQ) imbalances are evaluated with a direct IQ down-converter in the W-band (75–110 GHz). The IQ imbalance of the converter is measured within a range of ±10 degrees in an intermediate frequency of DC–26.5 GHz. 1–8-G-baud quadrature phase-shift keying (QPSK) signals are transmitted successfully with observed bit error rates within a forward error correction limit of 2×10-3 using radio over fiber (RoF) techniques. The direct down-conversion technique is applicable to next-generation high-speed wireless access communication systems in the millimeter-wave band.
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