Design and Implementation of LTE Transceiver on a Software Defined Radio Platform

Cloud-RAN is viewed as an architecture evolution based on a new base station architecture recently. Unlike conventional communication networks, it just needs to deploy antennas and RF modules in the serving area, and most baseband signal processing is centralized in baseband units using software to increase spectral efficiency and reduce operating costs. In this thesis, based on the concept of C-RAN, we realize the system of basestation and user equipment in physical layer on a software defined radio platform according to LTE standard. We use the NI-USRP 2932 as the transmitter to tansmit RF signal and the receiver to receive RF signal. Also, we utilize the API of Ettus Research and the functions of OpenLTE to develop the software transceiver in the Ubuntu enviromnet. Finally, we use the multi-cores computer that can run multi-threads program parallelly and propose the improved architecute to resist latency to achieve uplink or downlink communication and let real-time be feasible. To verify the system, combining the RF modules and software we developed, we do some demonstrations: In the downlink transmission, we can over-the-air transmit files with 1.92 MHz sample rate. Also, we can transmit files with uplink and downlink both ways. We proved that software defined radio in LTE is workable by demonstration.