Proc. SPIE. 9772, Broadband Access Communication Technologies X
KEYWORDS: Signal to noise ratio, Digital signal processing, Radio over Fiber, Receivers, Phase shift keying, Heterodyning, Frequency conversion, Forward error correction, Signal detection, Hybrid fiber radio
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.