Abstract
This article introduces a digital private network of mobile communication dedicated chipset CMX7141 that used for the 4FSK modulation and demodulation in DCR system, and introduces the application of CMX7141 inthe DCR system. Focus research on the channel codec techniques of the chip and have a simulation on the channel coding and decoding. The simulation results indicate that, through channel error correction technique in CMX7141, the BER of DCR system reduces greatly and the transmission quality of DCR system is improved.
Highlights
With the development of the information age, people urgently request the intercom have the function such as voice encryption, data transmission, net dispatching and so on
This article introduces a digital private network of mobile communication dedicated chipset CMX7141 that used for the 4FSK modulation and demodulation in DCR system, and introduces the application of CMX7141 in the DCR system
Used international communication standard of digital radio such as: TETRA, DMR[1], digital Private Mobile Radio (dPMR)[2] and DCR standard[3], TETRA (Trans European Terrestrial Trunked Radio) Digital trunking communication system is professional mobile communication system based on TDMA digital technology; Digital mobile radio standard was released for professional radio users (PMR) by ETSI; DPMR is a digital radio protocol, it through provides user the low cost, use lowcomplexity technology realizes the advanced function
Summary
With the development of the information age, people urgently request the intercom have the function such as voice encryption, data transmission, net dispatching and so on. The traditional analog radio defect has been gradually reflected. Private wireless communications system is gradually transform from analog to digital. Digital intercom has received worldwide attention, research on digital intercom technology and the standardized work is prompting forward. ICOM、KENWOOD and many other Japanese manufacturers promulgated DCR standard for digital commercial interphone. It’s enacted based on digital Private Mobile Radio (dPMR). It’s conforming to ARIB’s T98 Digital Convenience Radio standard. It implements modulation and demodulation, channel coding and decoding, framing and frame disassembled, and many other key technologies in DCR standard. This paper focuses research on codec design in DCR system and punctured convolutional encoding and decoding analyze the BER of different codec mode and gives the Matlab simulation results
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