Development History

Within wireless communication systems, to cover shadow areas, expand coverage, and disperse call traffic, the repeater concept was introduced. Conventional RF (Radio Frequency) repeaters receive signals through the air from the Base Station or node B, amplify the signals and then transmit the amplified signals to the target/coverage area.  However, there were serious technical problems which interfered with the entire wireless network system.  If the required isolation (separation between donor antenna and coverage antenna) is not satisfied, the transmitted signal from the coverage antenna feeds back into the donor antenna and it causes signal oscillation. To prevent this oscillation problem, many solutions have been introduced including optical repeaters, frequency shift repeaters, microwave repeaters, and laser repeaters. But those solutions produced other problems such as high implementation and maintenance costs, frequency occupation and weather related problems.

To overcome all of these problems, RF Window developed and introduced ICS (Interference Cancellation System) technology to repeaters.  The ICS repeater is able to distinguish the feedback signals from the original source signals and cancel the interfering feedback signals using DSP (Digital Signal Processing) avoiding oscillation.  With ICS repeaters, the service provider can expand coverage, minimize shadow areas, and solve many customer complaints with an economical solution.

Since RF Window introduced the first model to the market in 2004, ICS repeaters have evolved to a smaller size with better performance at a lower price. Within 4 years, RF Window has developed ICS repeaters approximately half the size at one quarter the price with 9 times better performance.