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____ is a method used for calculating beamforming weights.

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____ is a method used for calculating beamforming weights.

(a) Sample matrix inversion

(b) Indirect matrix inversion

(c) Convolution

(d) Correlation

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This intriguing question comes from Smart Antenna in section Smart Antenna & Software Component Characteristics of Cognitive Radio

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The correct answer is (a) Sample matrix inversion

The explanation: Sample matrix inversion or direct matrix inversion is a method used for calculating beamforming weights based on a known training sequence of length L. Adaptive algorithms iterate the weights in accordance to the received training sequence. A final estimate is obtained at the end of the training sequence.

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