Frequency-domain decision feedback equalizing device and method
First Claim
1. A frequency-domain decision feedback equalizer device for single carrier modulation comprising:
- a first section configured to generate an output signal and includinga fast Fourier transformation circuit configured to perform a fast Fourier transformation on a first vector of signals inputted into said first section, and outputting a second vector of signals,a feed forward equalizer circuit configured and coupled to perform feed forward equalization by multiplying each of the components of said second vector of signals with equalization parameters, and outputting a third vector of signals, andan inverse fast Fourier transformation circuit configured and coupled to perform an inverse fast Fourier transformation on said third vector of signals, and outputting a fourth vector of signals; and
a second section includinga feedback filter circuit configured and coupled to perform linear filtering of a signal derived from an output signal of said second section,an adder circuit coupled to add the output signal of said feedback filter circuit to the output signal of said first section, anda detector circuit configured and coupled to receive the output signal of said adder circuit and generate said output signal of said second section by extracting samples from the output signal of said adding means.
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Abstract
A fast Fourier transformation is performed on a first vector of signals, and as a result a second vector of signals is provided. A feed forward equalization is performed by multiplying each of the components of said second vector with equalization parameters, and as a result a third vector of signals is provided. An inverse fast Fourier transformation is performed on said third vector, and as a result a fourth vector of signals is provided. An output signal of said first section is provided on the basis of said fourth vector of signals. In a second section a signal derived from an output signal of said second section is is filtered via linear feedback filtering and the filtered signal is added to said first section output signal, and an added signal is provided, and said second section output signal is generated by extracting samples from said added signal.
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Citations
28 Claims
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1. A frequency-domain decision feedback equalizer device for single carrier modulation comprising:
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a first section configured to generate an output signal and including a fast Fourier transformation circuit configured to perform a fast Fourier transformation on a first vector of signals inputted into said first section, and outputting a second vector of signals, a feed forward equalizer circuit configured and coupled to perform feed forward equalization by multiplying each of the components of said second vector of signals with equalization parameters, and outputting a third vector of signals, and an inverse fast Fourier transformation circuit configured and coupled to perform an inverse fast Fourier transformation on said third vector of signals, and outputting a fourth vector of signals; and a second section including a feedback filter circuit configured and coupled to perform linear filtering of a signal derived from an output signal of said second section, an adder circuit coupled to add the output signal of said feedback filter circuit to the output signal of said first section, and a detector circuit configured and coupled to receive the output signal of said adder circuit and generate said output signal of said second section by extracting samples from the output signal of said adding means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 26, 27, 28)
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14. A frequency-domain decision feedback equalizing method for single carrier modulation, preferably for use in a broadband communication system, comprising the steps of:
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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. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A frequency-domain decision feedback equalizer device for single carrier modulation, the device comprising:
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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.
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Specification