Unlicensed ISM bands were allocated decades ago, far before the explosion in WLAN. These frequency bands in the 900MHz, 2.4GHz and 5GHz spectrum provide the total sum of available spectrum for WiFi for over 30 years. Similar to the explosion in mobile broadband has been the increase in utilization of WiFi on the ISM bands. With this popularity, spectrum crunches are now being felt as the ISM bands become overused and congested. With TV White Space (TVWS) new spectrum has become available to the WLAN market, although with some significant technical challenges. Operating in slices of spectrum in the old analog TV bands, TVWS has been designated by the FCC to be a non-interfering, secondary application. This has two important implications for devices being designed to use this new spectrum: frequency agility and a tight transmit spectral mask are required. To operate a device in TVWS, it must first access a spectrum database and determine which channels or frequencies are available. Second and even more challenging is the requirement that the adjacent channel emissions be better than 72dB down at the edge of the channel. This extremely tight spectral mask, coupled with the need for these devices to continue to support standard WiFi bands, has limited the introduction of TVWS products. The ARF Product Line with its high performance and low power consumption meet and exceed regulatory requirements while also providing access to the entire spectrum, enabling TVWS as a real and viable WiFi band.
Aviacomm Launches TV White Space in the Philippines
Aviacomm, along with partners HuwoMobility and FAST, launched the first of many coming TV White Space networks in the Philippines, having the goal of bringing Internet access to rural communities all across the country. See the video presentation here!