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Error-control coding for P25 radios

Published Wednesday, March 01, 2006

Project 25 is a digital radio airlink standard designed to create interoperability on 12.5 kHz and 6.25 kHz channels. Although Project 25 radios can pass voice or data communications, this article will focus strictly on error-control coding for voice communications. P25 modulation comes in two flavors, Compatible 4 FM (C4FM) and Compatible Quadrature Phase Shift Keying (CQPSK) [1]. C4FM is intended for Phase I P25 systems that operate on 12.5 kHz channels, while CQPSK is intended for Phase II P25 systems that will operate on 6.25 kHz channels. In both cases, the signaling rate is 4.8 k symbols ...

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