GPU를 이용한 소프트웨어 기반의 2X2 MIMO LTE 기지국 시스템 구현

Abstract

In this paper, we demonstrate a software-based base station for LTE mobile communications providing the functionality of software-based reconfiguration. In many conventional systems, SDR technology has been implemented using Digital Signal Processor (DSP) and/or Field Programmable Gate Array (FPGA). However, the problem with DSP and FPGA is that operation processing speed is very limited in DSP and FPGA needs too much development time especially the debugging procedure. We implement a SDR-based LTE modem using Graphic Processing Unit (GPU) which resolves all the defects of DSP and FPGA. GPU is a high-speed parallel processor which provides very important advantage of using a very powerful C-based programming environment that is Compute Unified Device Architecture (CUDA). The implemented software-based base station system processes baseband signals through GPU. It utilizes USRP2 as its RF transceiver. In order to guarantee a real-time processing of LTE baseband signals, we have adopted well-known signal processing algorithms such as scrambling, frame synchronization algorithms, channel estimation, etc. using GPU operating in parallel processing.