Frequency-domain decision feedback equalizing device and method

A frequency-domain decision feedback equalizing method for single carrier modulation, preferably for use in a broadband communication system, comprising the steps of:

• in a first section providing an output signal of said first section by:
• performing a fast Fourier transformation on a first vector of signals inputted, and as a result providing a second vector of signals,
• performing a feed forward equalization by multiplying each of the components of said second vector of signals with equalization parameters, and as a result providing a third vector of signals,
• performing an inverse fast Fourier transformation on said third vector of signals, and as a result providing a fourth vector of signals, and
• providing an output signal of said first section on the basis of said fourth vector of signals;
• and
• in a second section:
• performing a linear feedback filtering of a signal derived from an output signal of said second section, and providing a filtered signal,
• adding said filtered signal to said output signal of said first section, and providing an added signal, and
• generating said output signal of said second section by extracting samples from said added signal.

A frequency-domain decision feedback equalizer device for single carrier modulation, the device comprising:

• a first section including
• a fast Fourier transformer to perform a fast Fourier transformation on a first vector of single carrier signals inputted into said first section, and to output the transformed signals as a second vector of signals,
• a feed forward equalizer to perform a feed forward equalization by generating equalization parameters using a fast Fourier transformation estimation of a channel impulse response of an output single carrier signal of said first section, multiplying each of the components of said second vector of signals with the generated equalization parameters to reduce the signal-noise ratio of the signals, and outputting the multiplied signals as a third vector of signals, and
• an inverse fast Fourier transformer to perform an inverse fast Fourier transformation on said third vector of signals, and to output the inversely transformed signals as a fourth vector of signals that is the output signal of the first section;
• and
• a second section including
• a feedback filter to linearly filter a signal derived from an output signal of said second section,
• an adder to add the output signal of said feedback filter to the output signal of said first section, and
• a detector to receive the output signal of said adder and generate said output signal of said second section by extracting samples from the output signal of said adder.