1MITOLA J. Cognitive radio for flexible mobile multimedia communi-cation[A].San Diego,USA,1999.3-10.
2ZHOU H C,RATNARAJAH T. A novel interference draining scheme for cognitive radio based on interference alignment[A].Singa-pore,2010.1-6.
3FRANCESCO N,IRFAN G,DIRK T M. Spatial interweave for a MIMO secondary interference channel with multiple primary users[A].Barcelona,Spain,2011.1-5.
4NOSRAT-MAKOUEI B,ANDREWS J G,HEATH R W. A simple SINR characterization for linear interference alignment over uncertain MIMO channels[A].Austin,USA,2010.2288-2292.
5SHYAMNATH G,SAMUEL D P,DINA K. Interference alignment and cancellation[A].Barcelona,Spain,2009.159-170.
6PERLAZA S M,DEBBAH M,LASAULCE S. Opportunistic interference alignment in MIMO interference channels[A].Cannes,France,2008.1-5.
7PERLAZA S M,FAWAZ N,LASAULCE S. From spectrum pooling to space pooling:opportunistic interference alignment in MIMO cognitive networks[J].{H}IEEE Transactions on Signal Processing,2010,(07):3728-3741.
8KRIKIDIS I. A SVD-based location coding for cognitive radio in MIMO uplink channels[J].IEEE Communications Let ers,2010,(10):912-914.
9AMIR M,EL-KEYI A,NAFIE M. Constrained interference alignment and the spatial degrees of freedom of MIMO cognitive networks[J].{H}IEEE Transactions on Information Theory,2011,(05):2994-3004.
10ZHOU H C,RATNARAJAH T,LIANG Y C. On secondary network interference alignment in cognitive radio[A].Aachen,Germany,2011.637-641.