August 2002 Newsletter. ELVA-1.

ELVA-1 Millimetre Wave Division Newsletter 08/2002

Contents:

45Mbps Wireless Internet Broadcasting System was tested at 42GHz

As our telecom products development continued, in July-August 2002 we have tested a new high-speed wireless Internet broadcasting system, based on ELVA's set of Microwave Transmitter/Receiver Stations for Ground-based Video Distribution System (http://www.elva-1.com/products/telecom/mvds.html). The test was done with collaboration with Centermedia communication operator from St.Petersburg, Russia.

Figure 1. A flow block schema of the test

During the test, the 42GHz Base Station with antenna to cover 90-degree sector was installed on the house-top of the high 22-floor building. Two client receivers with 30cm-dish antennas of 38.5 dB were located on distances of 2km and 13km, so we also tested the max range of the wireless channel and the propagation of the signal. To organize downstream IP channel we used Linux Server with IP-Incapsulator software running. ELVA's own software IP Incapsulator was used instead of expensive third-party hardware IP Incapsulator to bring down the total cost of the solution. The server output was connected to DVB modulator and at last point - to the 42GHz transmitter on the house-top.

Each of the client receivers was connected to Celeron 433MHz personal computer with a satellite tuner card installed. To generalize the test, we used a basic 100USD value satellite tuner card that is widely available in many PC stores.

During the test the base station had a dial-up return link to ISP while to organize upstream channel to ISP we used ELVA's PPC 100 Wireless LAN Bridge for Client1 and fiber-optic link for Client2 (see Fig.2). In general, an architecture of the wireless Ineternet broadcasting is an asymmetric network, where the downstream channel has a much higher bandwidth allocation (faster data rate) than the upstream (return link) to ISP. So, the architecture of return links that we used at the test was not typical for Internet broadcasting. But we wanted to prove the system is operative even at worst non-standard case of return links architecture.

Figure 3. A schema of return links at the test

The results we got were as following - max file download speed on either of distances for Celeron433 client was 10Mbps, that is perfect to see live video
with DVD quality. When we replaced Celeron 433 PCs to newer Celeron 1200 PCs the download speed went up to 30Mbps.

The test confirmed that the link is operative far beyond of the guaranteed link range of 7km. The signal on 13km-distance client was with SNR>12dB that means all equipment of this wireless channel have outstanding specs so works at the apparent limit of noise-immunity.

The test also proved that even when we used the low-speed dial-up as return link, ELVA's Base Station and Client Stations allows to build a network to broadcast a video-on-demand by IP. Form marketing viewpoint, our equipment would have a demand on the growing market of home cinema TV and satellite TV services.

For asymmetric IP and ground-based video broadcasting, the network providers and their clients can benefit from very low cost of equipment to organize and use the broadcasting service compare to satellite-based solution. More over, because of smaller time delays at upstream links, this leads to a higher speed of the overall downstream IP throughput. Another market opportunity grows for a first time for an up-market clients who own home cinema TV at their premises. They could start to watch DVD movie from a video library connected to Base Station immediately after they requested it from home PC.

For more info and specs requests please email sales@elva-1.com

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