The Minimum Mean Square Precoding Method for Eliminating Asynchronous Interferences in Cognitive Radio System
Jingxue Ran · International Journal of Future Generation Communication and Networking · 2014
If there is a certain distance between the primary users and the second, there are asynchronous interferences because of existing nonsynchronous signals.And the interferences do not influence only the primary user system, but they could also affect second user system and increase interference.To solve this problem and to eliminate interference to primary and secondary asynchronous users among which there are influences in wireless communication system, a novel kind of precoding method based on the minimum mean square error is put forward in this paper.In this method, asynchronous interferences are eliminated in the precoding process and this process also satisfies users' server quality.Analysis and simulation show that the proposed scheme effectively ,under the condition of the limitation of interferences in main user system, enhance the second user system capacity and improve the reliability of the transmission system of second users system.