@conference {111, title = {Using Complementary Sets of Sequences for Direct Channel Estimation in Asynchronous Systems}, booktitle = {4th IEEE International Symposium on Intelligent Signal Processing (WISP2005)}, year = {2005}, month = {09/2005}, pages = {1-6}, address = {Faro, Portugal}, isbn = {0-7803-9031-8}, author = {Fernando J. {\'A}lvarez and Ure{\~n}a, J. and {\'A}lvaro Hern{\'a}ndez and Manuel Mazo and J.J. Garcia and Carlos De Marzziani and Jos{\'e} Manuel Villadangos and Ana Jimenez} }