Research And Implementation Of Bit Synchronization In DMR System

DMR is the latest digital mobile communication standard which is developed by the ETSI. As a system of two-slot TDMA structure, fast and accurate synchronization and timing is essential. This paper simulates and implements bit synchronization technology based on the baseband modulation signal of 4FSK in DMR system. First, this paper simulates the digital filter and square timing algorithm and the maximum mean power algorithm, compares their bit error ratio and timing jitter. Then, this paper accomplishes the super frame transmission by programming the filter and square algorithm on the chip TMS320VC5510. In addition, this paper proposes some improvement program to adapt the property of the RF module. Finally, simplex and duplex baseband and RF communication tests are carried out as well as the system with bit synchronization module, and the performance measurement of the whole transmission system is presented.