U.S. Philips Corporation

Com-research Gmbh

Raimund Meyer

Wolfgang Gerstacker

Johannes B Huber

Peter Schramm

Robert Fischer

Stefan Muller

Robert Schober

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 digital transmission system comprising a receiver, in which system a trellis-based estimation method (3) with a number of states reduced as a result of feedback (5) of at least one feedback value (.xi.) forms estimates (a) for a received signal (r) by means of an estimated impulse response (h) of a transmission system (1), a feedback value (.xi.) being determined from at least one estimate (a). With reduced-state estimation methods for the digital transmission, the problem consists of the additional noise components caused by the feedback of preliminary false symbol decisions. To achieve optimum estimates (a) for the received signal (r) despite a reduced number of states due to feedback, the receiver forms the feedback value (.xi.) from at least one intermediate value (a.sub.SDF). In digital transmission systems, the transmit symbols (a) and the estimates (a) have the values -1 or 1 in the receiver. In the receiver according to the invention, intermediate values (a.sub.SDF) having a value in the range from -1 to 1 can be fed back, so that a better feedback value (.xi.) and thus better estimates (a) for the received signal (r) may be achieved.

Digital transmission system with a trellis-based, reduced-state

Equalizer with a sequence estimation method with state reduction for a

Equalizer with extended channel estimation for a receiver in a digital

Growing community of inventors

Nurnberg, Germany

Raimund Meyer