Specifications

Interface Protocols
Operating Characteristics
August 08, 2000 68P81095E55-E 3-5
Radio Carrier Characteristics
Motorola has long been noted for an ability to provide clear and distinct frequency
channel definitions. This is accomplished with superior out-of-band rejection and a
narrow in-band frequency sensitivity at a precise frequency center. The iDEN
system provides high modulation efficiency, carrier sensitivity, optimal Carrier-to-
Interference Ratio trade-offs, with low adjacent carrier interference. The carrier fits
within the FCC digital emission mask (Figure 3-1). The mean power in either
adjacent carrier is greater than 60 dB below the mean output power in the desired
carrier. Filtering to prevent cellular interference is also performed.
Figure 3-1 Radio Carrier Definition showing Motorola Precision
Signal Processing
The iDEN system uses digital technologies to process and broadcast voice and data
communication information. Digital processing provides improved voice and data
quality when compared to analog because digital signals provide superior abilities to
filter out noise, compress data, and multiplex signals on a single carrier.
Noise filtering improves voice and data quality because the characteristics of non-
voice and spurious data signals can be identified and removed with digital filters.
The compression of voice and data streams allows the system to transmit more
information in a given timeframe.
Since data is compressed and digitized, the iDEN system can optimize system
resources by sharing the resources.