DESIGN AND PERFORMANCE ANALYSIS OF AN ADVANCED, NARROW-BAND INTEGRATED VOICE DATA MOBILE RADIO SYSTEM

Private land mobile communications have experienced significant demand for increased capacity and for new services, but congestion within th e currently allocated 450 and 800 MHz bands has severely limited the c apability of present-generation systems to meet this demand. This pape r proposes a narrowband integrated voice/data mobile radio system whic h triples current voice traffic capacity and simultaneously provides c apacity for mobile data communications such as mobile data terminals, automatic vehicle location, and mobile facsimile by utilizing the sile nce gaps inherent in speech. The system is designed to fit within the narrowband 25 kHz channels in the 450 and 800 MHz frequency bands, and thus the system can replace existing private land mobile radio system s with minimum impact. The centerpiece of the system design is an evol utionary multiplexing and access control technique known as Packetized Data, Voice Dedicated (PDVD) Burst Switching which allows transmissio n of data within the silence gaps inherent in speech. Simulation resul ts for various voice and data traffic loads show the flexibility and e fficiency of the proposed narrowband integrated voice/data mobile radi o system.