关键词: 云无线接入网络（C-RAN）, 现场可编程门阵列（FPGA）, 通用公共无线接口（CPRI）, 预处理, 长期演进（LTE）

Abstract: This paper presents C-RAN（Cloud Radio Access Network） front-end processing based on LTE by altera FPGA. Motivation of the research work is to accelerate the CRAN. The software stack is running on BBU（BaseBand Unit） pool servers, together with the FPGA front-end processing board, emulates the whole baseband signal processing flow. The FPGA board integrates rich communication interface, including PCI Express, 10 Gb/s Ethernet, CPRI（Common Public Radio Interface） optical connection etc., which enable it to bridge traditional telecom domain and IT data center domain. As an accelerator, the FPGA implements many key algorithm units required by baseband signal processing, which increases the system computing power greatly. Most importantly, with the innovative data pre-processing algorithms（Cyclic Prefix removal） the front-end processing can address the critical system bottleneck on host memory bandwidth and IO throughput. Front-end processing has been verified and tested.

Key words: Cloud Radio Access Network（C-RAN）, Field Programmable Gate Array（FPGA）, Common Public Radio Interface（CPRI）, pre-processing, Long Term Evolution（LTE）