| 摘要 |
A method for equalization of a signal propagating in a hybrid TD-CDMA system where U users transmit simultaneously with a receiver having a given CDMA signature sequence for generating a detected symbol which estimates a transmitted symbol comprises the steps of performing the DTF of each vector <i>d</i> output from the "matched filter" bank to find U vectors D to which to apply a transformation represented by a matrix GAMMA <-1> (for ZF-BLE) or a matrix [ sigma <2>MIM+ GAMMA ]<-1> (for MMSE-BLE) to find U vectors R<(1)>,..,R<(U)> und perform the IDFT for each vector R<(1)>,..,R<(u )> to find U vectors to be used as estimation vectors r<(1)>,...;r<(u)>. In ccordance with the method an equalizser comprises a matched filter bank (13) at the input of which is applied the received signal. The matched filter bank has in output U vectors <i>d</i> which are sent to a plurality of DTF calculation blocks (14) to find at the output of each block a corresponding vector D. Transformation means (15) perform on the vectors D the transformation represented by a matrix GAMMA <-1> if a ZF-BLE equalization is wanted or a matrix [ sigma <2>NIn + POUND g(G)]-1 if an MMSE-BLE equalization is wanted so as to give at thier output corresponding U vectors R<(i)>,...,R<(u)>. Each IDFT calculation block (16) receives one of the vectors R<(i)>,...,R<(u)> to supply at output a corresponding vector r. These vectors r are the sought estimation vectors r<(i)>,...,r<(u)>. |
