Adaptive known signal canceller
First Claim
1. A receiver comprising:
- a known signal canceller responsive to an input signal of a communication channel including known and unknown portions of information, said known signal canceller operative to generate a time domain unknown signal, and further operative to generate an estimated channel impulse response signal, the known signal canceller including a known signal canceller filter configured to utilize a signal from a known signal generator block to generate a filtered known signal, the known signal canceller further including a subtractor responsive to the input signal and operative to generate an output signal, the subtractor configured to subtract the filtered known signal from the input signal;
an equalizer coefficient computation block responsive to the estimated channel impulse response and operative to compute and generate time domain equalizer coefficients; and
a time domain equalizer responsive to the time domain equalizer coefficients and to the output signal, and operative to generate an equalized signal, the time domain equalizer configured to filter the output signal using the time domain equalizer coefficients to yield an equalized signal.
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Accused Products
Abstract
An adaptive known signal canceller comprising of a known signal canceller filter responsive to a known signal including a known portion of a transmitted signal, the known signal canceller filter operative to generate a filtered known signal, and a subtractor unit responsive to an input signal and operative to generate an output signal, the subtractor unit configured to subtract the filtered known signal from the input signal to generate an output signal, such that the known portion of the transmitted signal is substantially removed from the input signal. The adaptive known signal canceller further comprising of a known signal canceller update unit, responsive to a desired signal and an output signal and operative to continually adjust the coefficients of the known signal canceller filter based on the difference between the output signal and the desired signal, so that the filter coefficients substantially reflect the impulse response of a channel.
28 Citations
14 Claims
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1. A receiver comprising:
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a known signal canceller responsive to an input signal of a communication channel including known and unknown portions of information, said known signal canceller operative to generate a time domain unknown signal, and further operative to generate an estimated channel impulse response signal, the known signal canceller including a known signal canceller filter configured to utilize a signal from a known signal generator block to generate a filtered known signal, the known signal canceller further including a subtractor responsive to the input signal and operative to generate an output signal, the subtractor configured to subtract the filtered known signal from the input signal; an equalizer coefficient computation block responsive to the estimated channel impulse response and operative to compute and generate time domain equalizer coefficients; and a time domain equalizer responsive to the time domain equalizer coefficients and to the output signal, and operative to generate an equalized signal, the time domain equalizer configured to filter the output signal using the time domain equalizer coefficients to yield an equalized signal. - View Dependent Claims (2)
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3. A receiver comprising:
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a known signal canceller filter responsive to a known signal including a known portion of a transmitted signal, the known signal canceller filter operative to generate a filtered known signal; and a subtractor unit responsive to the channel and operative to generate an output signal, the subtractor unit configured to subtract the filtered known signal from an input signal to generate an output signal, such that the known portion of the transmitted signal is substantially removed from the input signal, wherein the known signal canceller is operative to perform channel estimation and to provide an output signal in response to an input signal and a known signal. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A receiver comprising:
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a known signal canceller filter responsive to a known signal including a known portion of a transmitted signal, the known signal canceller filter operative to generate a filtered known signal; a subtractor unit responsive to the channel and operative to generate an output signal, the subtractor unit configured to subtract the filtered known signal from an input signal to generate an output signal, such that the known portion of the transmitted signal is substantially removed from the input signal; and a known signal generator, operative to generate a known signal including a known portion of a transmitted signal, wherein said known signal generator is further operative to stop generating signals during a time corresponding to an unknown portion of a transmitted signal.
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Specification