In this paper,an Interference Alignment and Cancellation(IAC)based transmission and scheduling scheme is proposed for an infrastructured Cognitive Radio(CR)Multiple-Input Multiple-Output(MIMO)system with multiple seco...In this paper,an Interference Alignment and Cancellation(IAC)based transmission and scheduling scheme is proposed for an infrastructured Cognitive Radio(CR)Multiple-Input Multiple-Output(MIMO)system with multiple secondary users.With the cooperation of Primary Base Station(PBS)and Secondary Base Station(SBS),a signal processing procedure is designed to guarantee the priority of the primary transmission.As a reward for offering help to the PBS,the SBS is granted communication opportunity.The transmission difference of various spatial channels is exploited in Secondary User(SU)scheduling.With the proposed scheme,interferencefree concurrent transmission of both PBS and SBS is implemented.Spatial channel resources can be effectively utilised compared with a traditional Interference Alignment(IA)based strategy.Simulation results show that the achievable data for primary transmission is enhanced by cooperative signal processing at the SBS.With respect to the SBS,its data rate grows with an increasing number of SUs by exploiting the multiuser diversity gain.展开更多
基金supported by the National Natural Science Foundation of China under Grants No. 61102057,No. 61231008the National Key Basic Research Program of China (973 Program) under Grant No. 2009CB320404+4 种基金the National Science and Technology Major Project under Grant No. 2012ZX-03003005-005the 111 Project under Grant No.B08038the Program for Changjiang Scholars and Innovative Research Team in University under Grant No. IRT0852the ISN Project under Grant No. ISN1103005the Fundamental Research Funds for the Central Universities under Grant No. K5051301014
文摘In this paper,an Interference Alignment and Cancellation(IAC)based transmission and scheduling scheme is proposed for an infrastructured Cognitive Radio(CR)Multiple-Input Multiple-Output(MIMO)system with multiple secondary users.With the cooperation of Primary Base Station(PBS)and Secondary Base Station(SBS),a signal processing procedure is designed to guarantee the priority of the primary transmission.As a reward for offering help to the PBS,the SBS is granted communication opportunity.The transmission difference of various spatial channels is exploited in Secondary User(SU)scheduling.With the proposed scheme,interferencefree concurrent transmission of both PBS and SBS is implemented.Spatial channel resources can be effectively utilised compared with a traditional Interference Alignment(IA)based strategy.Simulation results show that the achievable data for primary transmission is enhanced by cooperative signal processing at the SBS.With respect to the SBS,its data rate grows with an increasing number of SUs by exploiting the multiuser diversity gain.
