Race R2005: microwave optical duplex antenna link

Personal communications access networks using subcarrier multiplexed optical links

“…This is one of the most difficult problems in designing relatively large microcells with poor LOS coverage using SCMOL. Because of that, thousands of smaller pic0 cells (less than 100 m radius cell) with good LOS coverage i s seriously considered at higher frequencies, like 60 GHz [24]. This phenomenon rarely happens in big macro cells.…”

Received Power performance in downlink architecture of Radioover-Fiber Transmission system using OSSB Techniquedue to chromatic dispersion and laser linewidth

“…The high-power radiating base station antenna is replaced by a divided antenna system connected to the base station via optical fiber [3]. However, the performance of RoF systems depends on the method used to generate the optically modulated radio frequency (RF) signal, power degradation due to fiber chromatic dispersion, nonlinearity due to an optical power level, and phase noises from a laser and an RF oscillator [4][5][6][7][8][9][10][ [12][13][14][15][16][17][18].There are two techniques to generate the optically modulatedRF signal: Direct and External modulation. The direct modulation scheme is simple but suffers from a laser-frequency chirp effect, and this chirp effect results in severe degradation of the system performance.…”

Outdoor and indoor applications for broadband local loop with fibre supported mm-wave radio systems

“…This technical solution has been introduced in MODAL project by partners of previous RACE I1 fundings by European Community [3]. Block diagram is presented in fig 1. The optical carrier is splitted in two.…”