Telsima has successfully demonstrated a 50km (30mile) WiMAX system using the 450 MHz band with a 3 MHz channel under near line of sight conditions.
Telsima says their Sub-GHz solution is able to accommodate any carrier frequency from 400MHz to 1000MHz, enabling operators to rapidly deploy a tunable solution to suit their allocated frequency band.
The tests, conducted over a period of several days in the months of February and March of 2008 in Slovenia, stimulated significant commercial interest for using 450MHz and other sub-GHz frequencies. The base station used a vertically polarized antenna with 10.15 dBi gain. The subscriber station, using a Yagi antenna with a 10.65 dBi gain, was installed in a car that drove across terrain that included dense foliage and wooded hills.
At a distance of 50 km, the WiMAX system communication link yielded excellent results; modulating at 64QAM in the downlink and 16QAM in the uplink; providing over 6Mbps throughput over the wireless link, says Telsima.
Burcak Beser, chief technology officer of Telsima, explained, “These lower frequencies perform better in wooded and hilly environments because of their superior wave propagation characteristics enabling large sectors and wave diffraction around interfering objects such as hills and buildings.
Telsima’s 450/700 MHz solution includes Base Stations, Subscriber Stations, NMS and Service Provisioning. Telsima’s Sub-GHz systems are able to deliver Internet, Voice and Multimedia services over a wireless broadband connection to remote users where coverage is more important than initial system capacity. This solution was unveiled in December 2007 and is expected to be in commercial deployments in the second half of 2008.
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