Aravind Chamarti

MIMO radio signals over fiber in picocells for increased WLAN coverage

We show that separating base station antennas in an optically-fed 2×3 MIMO WLAN system increases the overall coverage area in picocells. A peak throughput of 130 Mb/s was measured for antenna spacings of both 16 cm and 7 m.

RFID tag readability for tracking fiber optic connections in Data Centers

Data Centers have a very large number of optical fiber cables and connections, and there is a need to track the connectivity of these to assure proper network interconnection among the servers, switches, routers, and storage equipment. RFID tags integrated into the optical fiber cable connectors and the adapters into which they fit can be used to accomplish this tracking automatically. For patch panel fields, the resulting density of RFID tags is very high, but by proper antenna design it is possible to read all 456 UHF RFID tags in a typical patch panel field with 6 dB power margin, even at densities as great as 4.2 tagged components per square inch of patch panel surface area.

802.11a/g WLAN Radio Transmission at 1.3 pm over 1.1 km Multi-mode and ≫30 km Standard Single-mode Fiber Using InP VCSEL

We demonstrate WLAN radio transmission at 2.4GHz and in 5GHz band over a record distance of 1.1km multimode and ≫30km standard single-mode fibers with low EVM ≪4.9%rms using a 1310nm high-speed single-mode AlGaInAs/InP VCSEL.

Accuracy of UWB Ranging over Multimode Fiber With and Without In-Band WLAN Interference

Remote positioning of the ultra wide band (UWB) wireless technology based ranging systems using the radio over multimode fiber (RoMMF) technology is investigated here. The ranging accuracy of such a system with various fiber lengths is studied. Another aspect of the study involves the evaluation of the impact of a coexistent in-band wireless local area network (WLAN) signal (802.11a) on the accuracy of UWB ranging capabilities. The impact of a co-existent UWB signal on 802.11a WLAN performance is also evaluated using error vector magnitude (EVM) measurements.