Method and System of Communicatons
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Abstract
The present invention relates to wireless communications, and more specifically it relates to a method and system of relaying of wireless communications. Particularly, it relates to suppression and elimination of self-induced interference and oscillations in such systems, thereby facilitating repeaters with increased amplification gain providing extended communication range and improved performance in terms of data rates. Preferred embodiments specify antenna element weighting providing such interference suppression. The invention is, e.g., useful for spatial multiplexing and MIMO communications.
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Citations
38 Claims
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1-20. -20. (canceled)
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21. A method of interference mitigation for a repeater station, the repeater station comprising at least one antenna with two or more antenna elements with which the repeater station is configured to communicate signals wirelessly, said method comprising:
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determining a channel representation of a feedback channel from an output connection of the repeater station to an input connection of the repeater station, wherein the channel representation comprises a channel matrix of matrix elements, and wherein the feedback channel is represented by a transfer function or impulse response corresponding to various antenna elements of the at least one antenna; setting weights for the various antenna elements based upon the channel representation, to suppress signal transfer from the output connection to the input connection of the repeater station, said weights being amplifying or delaying signals to or from the various antenna elements, to suppress signal transfer from the output connection to the input connection of the repeater equipment; and wherein the weights are determined to correspond to;
elements of a weight matrix in the null space of the matrix representation of the feedback channel;
or elements of a weight matrix in the null space of the matrix representation of the feedback channel multiplied by a predetermined receive matrix;
or elements of a matrix in a predefined extension of the null space of the matrix representation of the feedback channel, the predefined extension being determined by a number representing a particular number of singular vectors achieved from a singular value decomposition of the matrix representing the feedback channel;
or elements of a matrix in a predefined extension of the null space of the feedback channel multiplied by a predetermined receive matrix, the predefined extension being determined by a number representing a particular number of singular vectors achieved from a singular value decomposition of the matrix representing the feedback channel multiplied by a predetermined receive matrix; andfurther wherein said weights are determined so that the rank of the communications channel provided by the repeater station is greater than one. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A repeater equipment for a repeater station for wireless communications, said repeater station comprising at least one antenna with two or more antenna elements with which the repeater station is configured to communicate signals wirelessly, and said repeater equipment comprising one or more processing circuits configured to:
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determine a channel representation of a feedback channel from an output connection of the repeater station to an input connection of the repeater station, wherein the channel representation comprises a channel matrix of matrix elements, and wherein the feedback channel is represented by a transfer function or impulse response corresponding to various antenna elements of the at least one antenna; and set weights for the various antenna elements based upon the channel representation, to suppress signal transfer from the output connection to the input connection of the repeater station, said weights being amplifying or delaying signals to or from the various antenna elements; and wherein said one or more processing circuits are configured to set the weights so that the weight elements correspond to;
elements of a weight matrix in the null space of the matrix representation of the feedback channel;
or elements of a weight matrix in the null space of the matrix representation of the feedback channel multiplied by a predetermined receive matrix;
or elements of a matrix in a predefined extension of the null space of the matrix representation of the feedback channel, wherein the one or more processing circuits are configured for determining the predefined extension by a number representing a particular number of singular vectors achieved from a singular value decomposition of the matrix representation of the feedback channel;
or elements of a matrix in a predefined extension of the null space of the matrix representation of the feedback channel multiplied by a predetermined receive matrix, wherein the one or more processing circuits are configured for determining the predefined extension by a number representing a particular number of singular vectors achieved from a singular value decomposition of the matrix representation of the feedback channel multiplied by the predetermined receive matrix; andfurther wherein the one or more processing circuits are configured to set the weights so that the rank of the communications channel provided by the repeater station is greater than one. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification