urgentcomm » SMT

Does the digital radio standard come up short?

Published Sunday, April 01, 2001

A couple of years ago, I created a computer simulation of digital radios with some TIA-102 (a.k.a. Project 25) characteristics. I was motivated to create these computer simulations by information being passed around in some public safety radio circles that narrowband digital radios may have inadequate system coverage compared to analog FM. I wanted to understand if there was a theoretical basis that would contribute to this reduction. I specifically modeled a four-level, frequency-shift-keyed transmitter (similar to the current TIA-102 Phase-I C4FM digital modulator) and a π/4QPSK transmitter (similar to the future TIA-102 Phase II CQPSK digital modulator) ...

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