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Distributed base station's basic structure is very different from the integration of traditional base station. It will be divided into two parts, base-band part (BBU) and the RF part (RRU). This distributed architecture with flexible configuration, convenient cheap nike shoes construction, environmental adaptability, etc., applied more widely. In order to standardize the interface between the BBU and RRU, CPRI (Common Public Radio Interface) protocol came into being.In this paper, we discuss CPRI protocol applied in WCDMA system. It based on General Interface Circuit to ralph lauren polo shirts consider the specific requirements of how to use FPGA to achieve CPRI protocol. The author's main work focuses on uplink IQ Framing module, IQ Solutions downlink frame module, Serdes interface module, codec modules, as well as some control status display module. Baseband and RF board Lacoste Shirts unit should exchange digital signals in a special frame format. Uplink IQ Framing module is to complete the digital signal into the requirements of the CPRI frame format, and then use the optical fiber to transmit it chi flat iron to the baseband processing board. Similarly, the function of IQ Solutions downlink chi hair straighteners frame module is to divide the IQ data from the CPRI frame and send it to RF board for further processing. The cheap ralph lauren polo shirts function of Serdes interface module is to exchange data between FPGA chip and Serdes chip, which are in two different clock domains. Codec module is to complete 8B/10B codec in order to meet the needs of fiber transmission. The function of alarm display module is that when the link fails it can provide a number of warning instructions immediately, including signal ralph lauren polo shirts loss instruction and CPRI frame loss indication.In this paper, we also give a full simulation to all function modules. Most of the functional modules have been successfully applied in practical circuits.
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