Page 4 - NEXEDGE-Ability

Digital
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6.25 kHz
Digital
Can you read me?
Distance
®
Intelligibility
NEXEDGE uses the AMBE+2TM VOCODER, a state-of-the-art voice digitization and compression technology offering enhanced Forward Error Correction (FEC) and noise reduction so you get superior clarity at varying signal strengths for all digital call features.
Loud & Clear – Thanks to Advanced Digital Processing
A key element of the NXDN air interface is the AMBE+2TM vocoder which digitizes speech while retaining natural voice nuances, performs noise reduction, introduces FEC and compresses voice data to accommodate land mobile radio spectrum bandwidth and data rates. Next, the radio’s digital signal processor (DSP) protocol packages the vocoder, signaling, control, and FEC data together, converting it to a uniquely filtered 4-Level FSK digital waveform that modulates the transmitter. This results in a low bit-error-rate (BER) digital air interface so you get robust communications even in weak signal strength areas.
[ Coverage differences in fringe areas ]
Superior Audio Clarity with Extended Coverage
As RF signal strength weakens with distance, analog reception becomes increasingly noisy and intermittent. The low BER of NXDN improves reception in fringe areas, thereby effectively increasing coverage by as much as 20% over FM analog, resulting in a 50% increase in coverage area for digital 6.25 kHz. Compared to digital 12.5 kHz bandwidth operation such as
DMR, the narrower 6.25 kHz bandwidth enabled by the FDMA technology of NXDN extends range by 15%. Receiver filters are narrower and can thus reduce noise. The net result is superior clarity over a 30% wider coverage area.
Analog
Can you read me?
Digital
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Can you read me?
Distance
Can you read me? Can you read me?
Can you read me?
12.5 kHz
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Can you read me?
Distance Can you read me?
Distance Can you read me?
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Can you read me?
Can you read me?