In order to work out the problem of blind estimation by the subspace method, we need to estimate the accurate length of channel impulse response from the received signals. Although many methods to solve this problem have been proposed, any method have a disadvantage about estimation accuracy or computation. In this paper, we propose two methods to overcome this problem. One is the method focussing on the property of the eigen values of the autocorelation matrix of the received signals and AIC (Akaike Information Criterion) The other is the method using the relation of the product of the vector of each subspace and the autocorerlation matrix.
展开▼
