Beam forming apparatus and method for an array antenna system
First Claim
1. A beam forming apparatus for an antenna diversity system with an array antenna having a plurality of antenna elements, the apparatus comprising:
- an interference and noise calculator for estimating interference power RDOA and spectral noise density N0 of a radio channel using a signal received through the radio channel, and calculating total noise power of the radio channel according to the interference power and the spectral noise density;
a channel estimator for calculating a phase matrix including phase factors associated with a predetermined number of direction-of-arrival (DOA) values and a directional channel impulse response matrix using the total noise power, and calculating a combined channel impulse response by combining the phase matrix with the directional channel impulse response matrix; and
a beam former for performing beam forming for transmission and reception through the array antenna using the combined channel impulse response.
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Abstract
A joint channel and Direction of Arrival (DOA) estimation apparatus and method simplified to efficiently estimate a channel impulse response associated with a spatially selective transmission channel occurring in a mobile radio channel are provided. To uniformly process all directions, angles associated with a beam are predetermined according to a preset method. This selection calculates a linear system model with regular spatial sampling using regular spatial separation of beam angles. The novel beam forming compensates for a difference between an adaptive array antenna and a sector type antenna using appropriate beam steering according to the calculated linear system model, thereby improving performance and facilitating implementation.
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Citations
16 Claims
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1. A beam forming apparatus for an antenna diversity system with an array antenna having a plurality of antenna elements, the apparatus comprising:
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an interference and noise calculator for estimating interference power RDOA and spectral noise density N0 of a radio channel using a signal received through the radio channel, and calculating total noise power of the radio channel according to the interference power and the spectral noise density;
a channel estimator for calculating a phase matrix including phase factors associated with a predetermined number of direction-of-arrival (DOA) values and a directional channel impulse response matrix using the total noise power, and calculating a combined channel impulse response by combining the phase matrix with the directional channel impulse response matrix; and
a beam former for performing beam forming for transmission and reception through the array antenna using the combined channel impulse response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A beam forming method for an antenna diversity system with an array antenna having a plurality of antenna elements, the method comprising the steps of:
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estimating interference power RDOA and spectral noise density N0 of a radio channel using a signal received through the radio channel, and calculating total noise power of the radio channel according to the interference power and the spectral noise density;
calculating a phase matrix including phase factors associated with a predetermined number of direction-of-arrival (DOA) values and a directional channel impulse response matrix using the total noise power, and calculating a combined channel impulse response by combining the phase matrix with the directional channel impulse response matrix; and
performing beam forming for transmission and reception through the array antenna using the combined channel impulse response. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification