QAM UWB-Impulse Radio Using Optical Pulses Position Modulation for Optical Fiber-Wireless Links

We report on investigations conducted into the improvement in quality achieved using a 5 Gb/s Quadrature Amplitude Modulation (QAM) Ultra Wide Band-Impulse Radio (UWB-IR) on fiber, which was realized using optical pulse-position modulation and its corresponding demodulation method using two-step down-conversion. The experimental results obtained indicate that a Q factor > 3 is realized over a radio transmission distance of 1.5 m following 10 km optical fiber transmission. Further, investigations via simulations into whether any enhancements can be achieved from QAM UWB-IR Multiple-Input/Single-Output using plural antennas show that communication quality is improved.