Patent ID: 6240143
Filing Date: 2001-05-29
Classification: H04J

Abstract:
A transmission method in a communications system having an orthogonal vector and a quasi orthogonal masking function for obtaining a quasi orthogonal vector from the orthogonal vector and transmitting message signals according to the quasi orthogonal vector, comprising:receiving the quasi orthogonal masking function;determining a first block within the quasi orthogonal masking function, wherein the first block has an initial size;determining a second block within the quasi orthogonal masking function, wherein the second block has said initial size;swapping the positions of the first and second blocks within the quasi orthogonal masking function;determining the correlation with the orthogonal vector of the quasi orthogonal vector obtained with the further quasi orthogonal masking function;determining further blocks having a length larger than the initial length according to the correlation;swapping the positions of the further blocks within the quasi orthogonal masking function;changing the position of at least one of the first and second blocks within the quasi orthogonal masking function;permuting the quasi orthogonal masking function to provide a further quasi orthogonal masking function wherein said permuting comprises reflecting the quasi orthogonal masking function;applying the further quasi orthogonal masking function to the orthogonal vector to provide a further quasi orthogonal vector; andapplying the further quasi orthogonal vector to the message signal to provide an encoded message signal for transmitting the encoded message signal within the communications system.