| abstract |
A wireless combination time, frequency and spectral shaping communications method that transmits data in convolution unit matrices (data frames) of NxN (N2), where generally either all N2 data symbols are received over N spreading time intervals (each composed of N time slices), or none are. To transmit, the N2 sized data frame matrix is multiplied by a first NxN time-frequency shifting matrix, permuted, and multiplied by a second NxN spectral shaping matrix, thereby mixing each data symbol across the entire resulting N x N matrix (TFSSS data matrix). Columns from this N2 TFSSS data matrix are selected, modulated, and transmitted, on a one element per time slice basis. At the receiver, the replica TFSSS matrix is reconstructed and deconvoluted, revealing the data. The method can accommodate multiple users at once, can adapt to changing channel conditions, and is particularly useful for coping with channel impairments such as Doppler shifts. |