Lucas Costa Pereira Cavalcante

W-band photonic-wireless link with a Schottky diode envelope detector and bend insensitive fiber

The performance and potential of a W-band radio-over-fiber link is analyzed, including a characterization of the wireless channel. The presented setup focuses on minimizing complexity in the radio frequency domain, using a passive radio frequency transmitter and a Schottky diode based envelope detector. Performance is experimentally validated with carriers at 75-87GHz over wireless distances of 30-70m. Finally the necessity for and impact of bend insensitive fiber for on-site installation are discussed and experimentally investigated.

Low RF Complexity Photonically Enabled Indoor and Building-to-Building W-Band Wireless Link

We demonstrate W-band wireless transmission over distances covering both indoor and building-to-building scenarios with a setup of reduced complexity in the RF domain, employing a passive wireless transmitter and envelope detection at the receiver.

Channel characterization for high-speed W-band wireless communication links

We present and discuss results from an experimental characterization of the W-band indoor wireless channel, including both large and small scale fading phenomena as well as corresponding channel parameters and their impact on system performance.

Wavelet-Coded OFDM for Next Generation Mobile Communications

In this work, we evaluate the performance of Wavelet-Coding into offering robustness for OFDM signals against the combined effects of varying fading and noise bursts. Wavelet-Code enables high diversity gains with a low complex receiver, and, most notably, without compromising the systems spectral efficiency. The results show that the Wavelet-Coded OFDM system achieves a BER of 1E-3 with nearly 6 dB less SNR than the convolutional coded OFDM system in frequency selective channels with a normalized channel response variation rate of ζ=1E-4.The proposed system fits as a key enabler for the use of mm-wave frequencies in future generation mobile communication due to its robustness against multipath fading.

Requirements for bend insensitive fiber in millimeter-wave fronthaul systems

The impact of fiber bending on mm-wave radio-over-fiber transmission is investigated and the need for bend insensitive fiber for front-haul installation confirmed. A 70m W-band hybrid photonic-wireless link including bend insensitive fiber is demonstrated with BER<;10-6 at 5mm bending radius.

High capacity hybrid optical fiber-wireless links in 75–300GHz band

Seamless convergence of fiber-optic and the wireless networks is of great interest for enabling transparent delivery of broadband services to users in different locations, including both metropolitan and rural areas. Current demand of bandwidth by end-users, especially using mobile devices, is seeding the need to use bands located at the millimeter-wave region (30-300 GHz), mainly because of its inherent broadband nature. In our lab, we have conducted extensive research on high-speed photonic-wireless links in the W-band (75-110GHz). In this paper, we will present our latest findings and experimental results on the specific 81-86GHz sub-band. These include photonic generation of millimeter-wave carriers and transmission performance of broadband signals on different types of fibers and span lengths. We will also present our current work, where we propose an analysis framework that offers a multidimensional view of crucial parameters for millimeter-wave link design in the range of 75 GHz to 300 GHz.