Granted Patent B2

US 7,764,705 · App. 11/808,902 · Granted Jul 27, 2010

Abstract

Claims (57)

1. An apparatus, comprising:

a processor; and

a memory including computer program code,

the memory and the computer program code configured to, with the processor, cause the apparatus at least to

determine a channel estimate from interleaved frequency division multiple access input signals,

determine an error covariance matrix of the input signals,

determine weight factors on the basis of the channel estimate and the error covariance matrix and weighting and combining the input signals, and

remove unwanted frequency bins from the input signals prior to the error covariance calculation.

2. The apparatus of claim 1 , wherein the apparatus comprises an adjustable comb filter.

3. The apparatus of claim 1 , wherein the memory and the computer program code are further configured to, with the processor, cause the apparatus at least to:

determine a fast fourier transform for the input signals;

filter the unwanted frequency bins from the fast fourier transform; and

calculate an inverse fast fourier transform for the filtered fast fourier transform.

4. The apparatus of claim 1 , wherein the input signals comprise a desired signal on a first set of frequency bins and one or more unwanted signals each on a second set of frequency bins, wherein the first and second sets of frequency bins are orthogonal with each other.

5. A method, comprising:

providing, by a processor, a multitude of frequency bins;

determining, by the processor, a channel estimate from an interleaved frequency division multiple access input signals;

determining, by the processor, an error covariance matrix of the input signals;

determining, by the processor, weight factors on the basis of the channel estimate and the error covariance matrix and weighting and combining the input signals; and

removing, by the processor, unwanted frequency bins from the input signals prior the error covariance calculation.

6. The method of claim 5 , further comprising:

determining a fast fourier transform for the input signals in a first calculation unit;

filtering the unwanted frequency bins from the output signal of the first calculation unit;

calculating an inverse fast fourier transform for the filtered signal;

filtering the unwanted frequency bins from the output signal of the first calculation unit; and

calculating an inverse fast fourier transform for the output signal of a frequency bin selection unit with a second unit.

7. An apparatus, comprising

a processor; and

a memory including computer program code,

the memory and the computer program code configured to, with the processor, cause the apparatus at least to

receive two or more interleaved frequency division multiple access input signals, and having a multitude of frequency bins,

determine a channel estimate from the input signals,

determine an error covariance matrix of the input signals,

determine weight factors on the basis of the channel estimate and the error covariance matrix and weighting and combining the input signals, and

remove unwanted frequency bins from the input signals prior to the error covariance calculation.

8. An apparatus, comprising:

first determining means for determining a channel estimate from interleaved frequency division multiple access input signals;

second determining means for determining an error covariance matrix of the input signals;

third determining means for determining weight factors on the basis of the channel estimate and the error covariance matrix and weighting and combining the input signals; and

removing means for removing unwanted frequency bins from the input signals prior to the error covariance determination.

9. A non-transitory computer-readable storage medium encoded with instructions configured to control a processor to perform a process, the process comprising:

determining a channel estimate from interleaved frequency division multiple access input signals;

determining an error covariance matrix of the input signals;

determining weight factors on the basis of the channel estimate and the error covariance matrix and weighting and combining the input signals: and,

removing unwanted frequency bins from the input signals prior to the error covariance calculation.

10. The computer-readable storage medium of claim 9 , wherein the computer readable medium comprises at least one of a program storage medium, a record medium, a computer readable memory, a computer readable software distribution package, a computer readable signal, a computer readable telecommunications signal, and a computer readable compressed software package.

11. An apparatus, comprising:

channel estimating means for determining a channel estimate from interleaved frequency division multiple access input signals;

matrix calculator means for determining an error covariance matrix of the input signals;

estimator means for determining weight factors on the basis of the channel estimate and the error covariance matrix and weighting and combining the input signals; and

preprocessing means for removing unwanted frequency bins from the input signals prior to the error covariance calculation.

12. An apparatus, comprising:

a radio frequency receiving means for receiving two or more interleaved frequency division multiple access input signals, comprising a multitude of frequency bins;

a channel estimator means for determining a channel estimate from the input signals;

a matrix calculator means for determining an error covariance matrix of the input signals;

an estimator means for determining weight factors on the basis of the channel estimate and the error covariance matrix and weighting and combining the input signals; and

a preprocessor means for removing unwanted frequency bins from the input signals prior to the error covariance calculation.

Assignments (7)