Patent ID: 6256336
Filing Date: 2001-07-03
Classification: H04B

Abstract:
A method for detecting items of information transmitted according to the DS/CDMA principle in a receiver apparatus, the method comprising the steps of:simultaneously transmitting items of information in transmission signals d.sub.k (t) dependent on time t, over several individual connections k via a frequency channel;forming reception signals e(t), received by the receiver apparatus by convolution of the transmission signals d.sub.k (t) with individual channel coefficients h.sub.k (t) representing transmission channels and with spread codes c.sub.k (t) of the individual connections k, wherein the spread codes c.sub.k (t) of at least two connections k are present and known in the receiver apparatus;converting the reception e(t) signals in a base band;separating items of information g.sub.k (t) related to the individual connections k to form a connection separation in a first step, wherein mutual interferences between the connections are taken into account, and wherein an expanded code matrix, with the spread codes c.sub.k (t) of at least two connections k and with additional indications, is used for separating the reception signals e(t), the code matrix being inverted and multiplied by the reception signals e(t); andindividually equalizing the items of information g.sub.k (t) related to the individual connections k in a second step which is subsequent to the first step of separating items of information.