DragonWave today announced it has concluded field tests and confirmed the functionality of higher modulation modes of up to 2048 QAM on its Horizon packet microwave products. The field tests were conducted in Odessa, Ukraine. Deployments and analysis for the field test were done in coordination with DragonWave’s in-country partner UKRCOM and their customer, Intertelecom, one of the largest wireless service providers in the country.
To date, DragonWave has shipped over 800 Horizon links to Intertelecom.
Field testing the higher modulation sceme demonstrated the radios’ ability to transport up to 37 percent more data through existing microwave channels, which lowers the operator’s cost per bit. This testing was combined with dual channel operation and DragonWave’s unique Bandwidth Accelerator feature. The combination of these two features and the higher modulation, offered an increase in capacity of greater than three times to more than 1.3 Gbps in this test.
DragonWave is the first packet microwave supplier to offer 2048 QAM radios. This new capability can be added to existing links through a simple software download. All Horizon packet microwave radios support Hitless Automatic Adaptive Modulation, for increased capacity by using higher modes when link properties permit—even on existing links that have been designed for lower modulation modes.
Quadrature Amplitude Modulation conveys two digital bit streams, by changing (modulating) the amplitudes of two carrier waves. The two carrier waves are out of phase with each other by 90° and are thus called quadrature carriers.
The most common forms are 16-QAM, 64-QAM and 256-QAM. By moving to a higher-order constellation, it is possible to transmit more bits per symbol. However, if the mean energy of the constellation is to remain the same (by way of making a fair comparison), the points must be closer together and are thus more susceptible to noise and other corruption