U.S. Phillips Corporation

Com-research Gmbh

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Robert Schober

Marco Breiling

Johannes B Huber

Christian Rohde

Wolfgang Gerstacker

Raimund Meyer

Wing Kwan Ng

J&uuml;rgen Petersen

A method for interference suppression for TDMA and/or FDMA transmission, which at least approximately can be described as pulse amplitude modulation, with an arbitrary number of receive antennas. The method comprises filtering of at least one complex-valued received signal r[k] of one receive antenna with a filter with complex-valued coefficients f[k] for generation of at least one output signal y[k], forming at least one projection of at least one output signal y[k] onto a vector pwhich is assigned to this output signal y[k], summing of a majority, especially all of the output signals y[k] for forming a sum signal s[k], and feeding the sum signal s[k] into a device for detection, especially equalization. A system for interference suppression for TDMA and/or FDMA transmission is also disclosed.

Method for interference suppression for TDMA -and/or FDMA transmission

The invention relates to a receiver for a digital transmission system with an incoherent transmission method, which receiver includes an equalizer for forming estimates for a sequence of symbols a&lsqb;k&rsqb; transmitted by a transmission channel from received symbols r&lsqb;k&rsqb; by means of an impulse response h&lsqb;k&rsqb; that describes the transmission properties. For improving the receiving quality in an incoherent transmission method and transmission channels having intersymbol interference, it is proposed that the equalizer performs an incoherent maximum likelihood sequence estimation (MLSE) method to determine the estimates &acirc;&lsqb;k&rsqb; for the sequence of transmitted symbols a&lsqb;k&rsqb;. In channels having intersymbol interference, the incoherent MLSE method provides clearly better results than all the known incoherent receiving methods. As against frequency and phase offset, the incoherent MLSE method is considerably more robust than all the known coherent receiving methods. An expensive frequency and phase control may be omitted in this manner.

Receiver for a digital transmission system

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Erlangen, Germany

Robert Schober