The null() returns empty vector, how can I loose it
in [Matlab]
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From: Donya Gozar on 30 May 2010 05:33 > Nobody is going to be able to help you, because you haven't provided enough information for anyone to know what this code is meant to accomplish I am trying to implement a Matlab code of a paper regarding to TWRC (two way relay channel)(system contains K pairs) using the method Block-Diagonalization. The Matrix (H_k) is a random channel matrix for the kth pair, so obviously it is non singular, then the author defines a matrix H_tilda_k which is define as H_tilda_k=[H_1 …H_k-1 H_k+1…H_K], After that he defines Orthogonal basis for the null space of the matrix H_tilda_k as ( U_(H_tilda_k)). Then multiple it( U_(H_tilda_k)) with H_k… Hope up to here is clear, my problem is now, U_tilda is always an empty vector, so how can I implement further??? Am I doing sth wrong? Is there any Idea? tnx
From: Bruno Luong on 30 May 2010 05:47
"Donya Gozar" <dgozar(a)yahoo.com> wrote in message <httbcj$7tk$1(a)fred.mathworks.com>... > > Nobody is going to be able to help you, because you haven't provided enough information for anyone to know what this code is meant to accomplish > > I am trying to implement a Matlab code of a paper regarding to TWRC (two way relay channel)(system contains K pairs) using the method Block-Diagonalization. > The Matrix (H_k) is a random channel matrix for the kth pair, so obviously it is non singular, then the author defines a matrix H_tilda_k which is define as > H_tilda_k=[H_1 …H_k-1 H_k+1…H_K], > After that he defines Orthogonal basis for the null space of the matrix H_tilda_k as ( U_(H_tilda_k)). > Then multiple it( U_(H_tilda_k)) with H_k… > Hope up to here is clear, my problem is now, U_tilda is always an empty vector, so how can I implement further??? Am I doing sth wrong? Is there any Idea? It seems H_tilda_k is (K-1) x (K) matrix by removing kth row. Such "horizontal" matrix always has a non-empty null space. You must try to understand the notation in the paper. Nobody here can likely to help you on this aspect. Bruno |