Patent ID: 6449266
Filing Date: 2002-09-10
Classification: H04B,H04J

Abstract:
Data transmission method in a system which utilizes a CDMA method, in which several users communicate simultaneously on the Same frequency band, and in which each user has at least one corresponding broad-band information channel, and in which the information channel capacity of at least one user differs from the capacity of the other users, wherein the parameters of each information channel depend on the desired capacity and transmission quality, and that each information channel is detected by taking into account correlations between different channels corresponding to different users, wherein an effect of correlation arising from different spreading codes of the different channels is removed, and wherein: different users have data symbols of different length; the data symbol lengths of different users are selected in such a way that the symbol lengths used are fractions of the length of a specific given super symbol, the spreading code sequences that modulate the data symbols of the users recur at intervals of the given super symbol, during detection the interference between the users is decreased by taking into account the mutual correlations between the received signals, detection is implemented in such a way that a desired number of signals are received and correlation terms over the super symbol to be detected are calculated, and these correlation terms are utilized in the detection in such a way that the mutual interference between the signals to be transmitted with different data symbol rates is eliminated.