Why Modulation is Important on Your Wireless Link

By    November 21, 2013

QAM (Quadrature Amplitude Modulation) is widely used for digital radio communication. Variants of QAM are also used for many wireless and cellular technology applications. The advantage of using QAM is the ability to carry more bits of information per symbol. As higher modulations are used, more and more data can be packed into the frame.  Throughput increases as modulations go up: from 16-QAM to 64-QAM and now to 256-QAM. We can increase the data rate of a link by selecting a higher order of QAM.

While higher order modulation levels offer much faster data rates and higher levels of spectral efficiency for wireless broadband systems, the use of these types of modulation comes at a price. They are less resistant to interference and noise and need to be constantly adapted to current RF conditions. As a result, radio communication systems started to implement dynamic adaptive modulation techniques. These methods test channel conditions periodically and adapt a modulation scheme to obtain the highest data rate for a given set of conditions.

At Cambium Networks we are committed to the highest quality on your wireless link. Our newly released PMP 450 Access Point is designed using dynamic 256-QAM which is a higher modulation rate than the currently offered 64-QAM.  Higher capacity offers wireless service providers a unique opportunity to use the new PMP 450 solution for IPTV. Among other advantages, the new PMP 450 is interoperable with existing 430 SMs, offering the full benefits of the latest PMP 450 APs – higher capacity (125 Mbps) and an easier migration path to the latest platform.