Equalizers for Transmultiplexers Inorthogonal Multiple Carrier

ORTHOGONAL MULTIPLE CARRIER DATA TRANSMISSION Thomas Wiegand1 and Norbert J. Fliege2 1Telecommunications Institute University of Erlangen-Nuremberg Cauerstr. 7/NT, 91058 Erlangen, Germany [email protected] 2Telecommunications Institute Hamburg University of Technology Eissendorfer Str. 40, 21071 Hamburg, Germany [email protected] ABSTRACT Orthogonal multiple carrier data transmission systems are e ciently realized using modi ed DFT transmultiplexer lter banks. In data transmission applications, a non-ideal transmission channel causes distortions such as intersymbol interference and crosstalk between the subrate bands of the transmultiplexer. Hence, in order to equalize these distortions, subband equalizers, which a ect the intersymbol interference and crosstalk behavior, are considered for implementation. The special structure of modi ed DFT transmultiplexers requires a discussion concerning the various possibilities of placing the subband equalizers at the receiver. Wiener solutions and LMS adaptive algorithms for various new subband equalizer structures are derived and compared by means of simulation results.