Patent ID: 6956910

Claim:
A method of differential modulating, spreading, over-sampling and filtering of a stream of data bits forming symbols for transmission, the method comprising: determining an in-phase component I i and a quadrature component Q i for each symbol S i using differential modulation with respect to an I i−1 and a Q i−1 of a previous symbol S i−1 wherein i is an integer. indexing a row of an I matrix for the in-phase components using two of I i−1 /Q i−1 , I i /Q i , and S i and providing samples in the indexed row as a spread, over-sampled, filtered output of I i ; and indexing a row of a Q matrix for the quadrature components using two of I i−1 /Q i−1 , I i /Q i , and S i and providing samples in the indexed row as a spread, over-sampled, filtered output of Q i .