Frequency domain training of prefilters for receivers
First Claim
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1. A method for operating a receiver to recover data contained in a signal received from a communications channel, the method comprising:
- determining a frequency response of a conditioned channel without reference to a prefilter, wherein the conditioned channel has a delay spread that is shorter than a delay spread of the communications channel;
determining a frequency response of the communications channel;
computing a frequency response of the prefilter from the frequency response of the conditioned channel and the frequency response of the communications channel;
receiving the signal transmitted across the communications channel;
applying the prefilter to the received signal; and
processing the prefiltered signal to estimate the data contained in the signal.
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Abstract
A prefilter is trained as follows. The frequency response B of a conditioned channel is determined without reference to the prefilter, and the frequency response W of the prefilter is computed from the frequency response B of the conditioned channel.
14 Citations
50 Claims
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1. A method for operating a receiver to recover data contained in a signal received from a communications channel, the method comprising:
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determining a frequency response of a conditioned channel without reference to a prefilter, wherein the conditioned channel has a delay spread that is shorter than a delay spread of the communications channel; determining a frequency response of the communications channel; computing a frequency response of the prefilter from the frequency response of the conditioned channel and the frequency response of the communications channel; receiving the signal transmitted across the communications channel; applying the prefilter to the received signal; and processing the prefiltered signal to estimate the data contained in the signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A receiver for receiving a signal transmitted across a communications channel, the signal containing data, the receiver comprising:
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a training module comprising; a first module for determining a frequency response of a conditioned channel without reference to a prefilter, wherein the conditioned channel has a delay spread that is shorter than a delay spread of the communications channel; and a second module for computing a frequency response of the prefilter from the frequency response of the conditioned channel and a frequency response of the communications channel; a prefilter module coupled to the training module for applying the prefilter to the received signal transmitted across the communications channel; and circuitry for recovering data from the prefiltered signal. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A receiver for receiving a signal transmitted across a communications channel, the signal containing data, the receiver comprising:
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means for determining a frequency response of a conditioned channel without reference to a prefilter, wherein the conditioned channel has a delay spread that is shorter than a delay spread of the communications channel; means for computing a frequency response of the prefilter from the frequency response of the conditioned channel and a frequency response of the communications channel; and means for applying the prefilter to the received signal; and means for recovering data from the prefiltered signal.
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Specification