WCDMA technology has generally conducted on a global scale use. The WCDMA technology for the development is more and more important. WCDMA technology is not perfect, however, the code of the interference is one of its shortcomings. First, the article on third generation mobile communications were discussed on the WCDMA mobile communication systems and the development of China's third generation mobile communications research;the paper discussed on forming a base-band filter technology and digital filtering technology;the code of interference and its solution were discussed.It is proposed to form a filter paper for the WCDMA solution to solve the communication system in the code of the interference problem. In view of the power of MATLAB,the design of methods used to achieve a window function,bilinear transformation, directly or cosine law FDAtool design and methods. Finally that is based on MATLAB on various methods to be compared and analyzed the characteristics of the various methods, that the best design methods.
KEY WORDS :WCDMA,Baseband forming technology,Digital Filter