The Research And Realization Of WCDMA Base Band Signal Generator

In the process of WCDMA system's research and test, how to get the ideal WCDMA base band signal is a key question. There are few instruments that can generate the ideal WCDMA base band signal in the market. As a result, a WCDMA base band signal generator that used for the test of WCDMA base station is urgently needed by the market. The purpose of this paper is to meet this need, that is to design a base band signal generator based on WCDMA downlink.After a careful study of 3GPP protocol, the paper introduces the configuration of the WCDMA base band signal generator and explains the arithmetic of each module, including CRC, channel coding, interleaving, rate matching, spreading and filtering. Then, the paper realizes each module, and generate the ideal WCDMA base band signal. At the end of the paper, we would found the waveform in time domain and in frequency domain, They agree with the demand of WCDMA system.