Advantages of DMR Digital Radio
Digital Mobile Radio (DMR) is a digital radio standard specified for professional mobile radio (PMR) users developed by the European Telecommunications Standards Institute (ESTI), and first ratified in 2005.
Here are some of the advantages of DMR technology.
Higher spectrum efficiency
One of the key benefits of DMR is that it enables a single 12.5 kHz channel to support two simultaneous and independent calls. The DMR is backward compatible to legacy analog 12.5 kHz system. Both can exist in the same allocated spectrum, which means there is no need for re-banding or re-licensing, and at the same time doubling the capacity of the channel when operated in the new DMR system. Furthermore, there is no need for extra RF supporting equipment, and customer can keep the legacy analog system.
Longer battery life
For a two slots TDMA system, each call uses only one of the two available time slots, Therefore, it draws only half the amount of energy from the battery cell. This saves up to 40% of battery life when compared with legacy analog or FDMA systems.
With the combined application of low rate codec and digital error-correction technologies, DMR products provide superior voice performance compared to analog systems. It provides crystal clear audio quality even to the edge of coverage, which gives an impression that the caller is close by, and greatly improves user experience.
Having two slots in one 12.5 kHz channel offers the flexibility of supporting voice on Slot One while Slot Two can be simultaneously used for advanced control features such as priority calls, call interrupt or simply an additional voice channel. FDMA systems cannot deliver similar features, as they are limited to one function per 6.25 kHz channel spacing. DMR also extends traditional audio improvement to data channel, thus allowing more data applications to be integrated with DMR system.