Research And Implementation Of Uplink Physical Channel In B-Trunc System

In the information age,the Internet of everything is interwoven into a huge communication network.The huge amount of data puts new demands on the communication speed and communication quality of this giant network.Public services such as high-definition voice call and real-time video monitoring urgently need a new generation of trunking communication technology support,Broadband Trunking Communication(B-TrunC)came into being.This paper mainly studies the link composition and communication synchronization of B-TrunC uplink physical channel,implements the function of uplink based on multi-core DSP platform of TMS320C6670,tests two important interface Serial Rapid Input/Output(SRIO)and Ethernet port in the prototype system,completes the preliminary integrated debugging between MAC sublayer and physical layer.This paper analysis the physical protocol of B-TrunC,studies the data processing and key modules of Physical Uplink Shared Channel(PUSCH),establishes the simulation link based on MATLAB platform and obtains the performance curve of Gauss Channel and Rayleigh Channel,analysis the effect of synchronization on link performance,the simulation results shows that the accuracy of time synchronization and frequency synchronization is required to maintain the acceptable performance of the system in the presence of synchronization delay and frequency offset residuals.Based on the TMS320C6670 multi-core DSP platform,the paper studies the system flow and implementation of PUSCH in 20 MHz bandwidth.Aiming at the special requirements of the police system,the process under 8MHz bandwidth is designed and implemented,this paper explores the process of core timing,the design of key modules and the configuration of coprocessors,tests time/computational complexity of typical parameter conditions under two bandwidths.By comparing the performance of fixed-point-level implementation with that of floating-point simulation,the simulation results show that the performance loss of the system is less than 0.5dB.The performance curves of different platforms under the same conditions are obtained by simulation,which verifies the reliability of the B-TrunC implementation system for tolerance of time delay and frequency offset residuals.This paper studies the hardware structure and composition framework of B-TrunC private network system,introduces the basic principle of SRIO interface.By testing the rate for channel of different configuration,the connectivity between physical layer and MAC layer,the function for using switch networking communication,and analyzing the receiver mechanism,we verify the feasibility of the SRIO interface interaction logic in the B-TrunC private network system and prove that this interface can support the system required rate of 1966 Mbps.This paper introduces the related principles of Ethernet port communication.Through the addition of the TCP/IP protocol stack on the DSP side,the connectivity and throughput test of the Ethernet communication between the host computer and the DSP,the rationality of the Ethernet port interaction logic in the B-TrunC private network system is verified and tested.The interface can support the full load rate of 100 Mbps required by the system.Although we Optimize the task processing model of DSP in Ethernet port receiving.The preliminary system-level joint debugging test of the MAC layer and the physical layer of the B-TrunC private network system was completed,and the correctness of the physical layer software design of the entire private network prototype was verified.