Broadband millimeter-wave fiber-radio network incorporating remote up/downconversion

Fibre Radio Technology

“…This may also be a limitation when considering the ability to upgrade or reconfigure the radio network with the provision of additional radio channels or the implementation of required changes in RF frequency. The subsequent requirement for an LO at the antenna BS in mm-wave fibre-radio access networks employing IF-over-fibre signal transport schemes, can be overcome by remotely delivering the LO signal from the central office [36][37][38]. This also enables the control of the LO signals themselves to be centralized thereby simplifying the architecture of the BS.…”

“…This also enables the control of the LO signals themselves to be centralized thereby simplifying the architecture of the BS. This LO signal can be delivered as RF over fibre via OSSB þ C modulation in order to avoid fibre dispersion effects [37,38] or as IF over fibre in conjunction with a sub-harmonic mixer located at the antenna BS [36].…”

“…Several methods have been reported for recovery of the LO signal in fibre-radio systems employing remote LO delivery, which can be achieved using either electrical [34,36,37] or optical [38] filtering techniques. The more conventional technique of frequency conversion at the BS when using IF-over-fibre transport schemes, is detection of the IF signal and then electronic frequency up-conversion using an electronic mm-wave mixer and LO.…”

A V-band up-converting InP HEMT active mixer with low LO-power requirements

“…C OMBINING optical fibers and millimeter-wave radio is a very promising approach for the realization of 60 GHz transceivers for wireless LANs [1], [2]. Mixers are of critical importance in the transceiver up-conversion path because they influence both the overall design and the final system performance.…”

Reference frequency signal transmission over optical fiber for CDMA-based microcellular system

“…Milli-meter wave systems for the wireless local loop to provide broadband services to the wireless subsc-ribers may be another application area of this technology [4].…”