US 2008/0075208 A1Published application

Frequency domain equalizer with one dominate interference cancellation for dual antenna radio

AssigneeBroadcom Corporation, a California Corporation

InventorsJunqiang Li, Nelson R. Sollenberger, Joseph Boccuzzi, Li Fung Chang

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Abstract

A Radio Frequency (RF) receiver includes a RF front end and a baseband processing module coupled to the RF front end that is operable to receive a time domain signal that includes desired signal and interfering signal time domain training symbols and time domain data symbols. The baseband processing module includes a channel estimator operable to process the desired signal and interfering signal time domain training symbols to produce a respective time domain channel estimates, a Fast Fourier Transformer operable to convert the time domain channel estimates to the frequency domain to produce frequency domain channel estimates, a weight calculator operable to produce frequency domain equalizer coefficients based upon the frequency domain channel estimates, an Inverse Fast Fourier Transformer operable to convert the frequency domain equalizer coefficients to the time domain to produce time domain equalizer coefficients, and an equalizer operable to equalize the time domain data symbols using the time domain equalizer coefficients.

Claims26

Dependent claims

A method for operating a Radio Frequency (RF) receiver comprising:

for a first diversity path that operates upon a first time domain signal:
producing a first desired signal time domain channel estimate and converting the first desired signal time domain channel estimate to the frequency domain to produce a first desired signal frequency domain channel estimate;
and
producing a first interfering signal time domain channel estimate and converting the first interfering signal time domain channel estimate to the frequency domain to produce a first interfering signal frequency domain channel estimate;
and
for a second diversity path that operates upon a second time domain signal:
producing a second desired signal time domain channel estimate and converting the second desired signal time domain channel estimate to the frequency domain to produce a second desired signal frequency domain channel estimate;
and
producing a second interfering signal time domain channel estimate and converting the second interfering signal time domain channel estimate to the frequency domain to produce a second interfering signal frequency domain channel estimate;
and
for a second diversity path of the RF receiver:
producing first frequency domain equalizer coefficients and second frequency domain equalizer coefficients based upon the first desired signal frequency domain channel estimate, the first interfering signal frequency domain channel estimate, the second desired signal frequency domain channel estimate, and the second interfering signal frequency domain channel estimate;
converting the first frequency domain equalizer coefficients to the time domain to produce first time domain equalizer coefficients;
converting the second frequency domain equalizer coefficients to the time domain to produce second time domain equalizer coefficients;
equalizing first desired signal time domain data symbols of the first time domain signal using the first time domain equalizer coefficients;
and
equalizing second desired signal time domain data symbols of the second time domain signal using the second time domain equalizer coefficients.

14 more elements

A method for operating a Radio Frequency (RF) receiver comprising:

receiving a time domain signal that includes desired signal time domain training symbols and data symbols and interfering signal time domain training symbols and data symbols;
processing the desired signal time domain training symbols to produce a desired signal time domain channel estimate;
processing the interfering signal time domain training symbols to produce an interfering signal time domain channel estimate;
converting the desired signal time domain channel estimate to the frequency domain to produce a desired signal frequency domain channel estimate;
converting the interfering signal time domain channel estimate to the frequency domain to produce an interfering signal frequency domain channel estimate;
producing frequency domain equalizer coefficients based upon the desired signal frequency domain channel estimate and the interfering signal frequency domain channel estimate;
converting the frequency domain equalizer coefficients to the time domain to produce time domain equalizer coefficients;
and
equalizing the desired signal time domain data symbols using the time domain equalizer coefficients.

6 more elements

A Radio Frequency (RF) receiver comprising:

a RF front end;
and
a baseband processing module coupled to the RF front end comprising:
a first diversity path operable to:
produce a first desired signal time domain channel estimate and convert the first desired signal time domain channel estimate to the frequency domain to produce a first desired signal frequency domain channel estimate;
and
produce a first interfering signal time domain channel estimate and convert the first interfering signal time domain channel estimate to the frequency domain to produce a first interfering signal frequency domain channel estimate;
a second diversity path operable to:
produce a second desired signal time domain channel estimate and convert the second desired signal time domain channel estimate to the frequency domain to produce a second desired signal frequency domain channel estimate;
and
produce a second interfering signal time domain channel estimate and convert the second interfering signal time domain channel estimate to the frequency domain to produce a second interfering signal frequency domain channel estimate;
an equalizer weight calculation module operable to produce first frequency domain equalizer coefficients and second frequency domain equalizer coefficients based upon the first desired signal frequency domain channel estimate, the first interfering signal frequency domain channel estimate, the second desired signal frequency domain channel estimate, and
the second interfering signal frequency domain channel estimate;
the first diversity path further operable to:
convert the first frequency domain equalizer coefficients to the time domain to produce first time domain equalizer coefficients;
and
equalize first desired signal time domain data symbols of the first time domain signal using the first time domain equalizer coefficients;
the second diversity path further operable to:
convert the second frequency domain equalizer coefficients to the time domain to produce second time domain equalizer coefficients;
and
equalize second desired signal time domain data symbols of the second time domain signal using the second time domain equalizer coefficients.

18 more elements

A Radio Frequency (RF) receiver comprising:

a RF front end;
and
a baseband processing module coupled to the RF front end, operable to receive a time domain signal that includes desired signal time domain training symbols and data symbols and interfering signal time domain training symbols and data symbols, and comprising:
at least one channel estimator operable to process the desired signal time domain training symbols to produce a desired signal time domain channel estimate and to process the interfering signal time domain training symbols to produce an interfering signal time domain channel estimate;
at least one Fast Fourier Transformer operable to convert the desired signal time domain channel estimate to the frequency domain to produce a desired signal frequency domain channel estimate and to convert the interfering signal time domain channel estimate to the frequency domain to produce an interfering signal frequency domain channel estimate;
a weight calculator operable to produce frequency domain equalizer coefficients based upon the desired signal frequency domain channel estimate and the interfering signal frequency domain channel estimate;
an Inverse Fast Fourier Transformer operable to converting the frequency domain equalizer coefficients to the time domain to produce time domain equalizer coefficients;
and
an equalizer operable to equalize the time domain data symbols using the time domain equalizer coefficients.

6 more elements

Dependencies are inferred from the claim text.