IEEE Pervasive Computing
The application of the IMBE speech coder to mobile communications
ICASSP '91 Proceedings of the Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
SEC'11 Proceedings of the 20th USENIX conference on Security
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APCO Project 25 (P25) is the digital communications standard that has widespread deployment amongst emergency first-responders in several different countries. This paper describes the implementation of a low-cost software-defined radio receiver for APCO Project 25 signals. The OP25 Receiver has been developed as part of an investigation into the security of the P25 protocol suite and provides low-level access to the actual message traffic using the WireShark packet sniffer. The proposed OP25 Receiver is a useful diagnostic and security analysis tool. Our initial experience suggests that the flexibility of the software-defined radio approach is well-suited to meeting the varying needs of public-safety radio communications.