New Teaching Techniques - Adaptive Interference Suppression

Following the development of science technology, technologies of education make more and more progress. Many new technologies such as multimedia, network, long distance communication are used in education. The uses of these technologies benefit education greatly. There are many problems must be resolved using these technology, one of which is interference canceling. Interference canceling are performed by interference chancellor. The function of normal interference is not very powerful and its performance is not quite good. In order to get better performance, we use adaptive interference chancellor. This paper researches the principal and normal structure of adaptive interference chancellor, discussing the LMS adaptive filter algorithm and it's anamorphosis algorithm that is used in adaptive interference chancellor. As to adaptive interference chancellor, this article analyzes two most widely used applications, that is: broadband interference in narrow band signal and narrow band interference in broadband signal. Firstly, it discusses the principle of adaptive interference chancellor, including broad band signal and narrow band signal; Secondly, it analysises one common algorithm used in adaptive interference chancellor, that is, LMS algorithm and its anamorphosis algorithm especially normalized LMS algorithm pointing out their relationship. After then, the paper talks about the structure and reality of canceling broad band noise in narrow band signal and narrow band noise in broad band signal and gives it's result simulation analyzing the factors affecting the power of the algorithm. In the last party, it gives the hardware design and assembly language software design using TMS32OC3 1, including the result of simulating.