Method and apparatus for forming a beam
AssigneeSamsung Electronics Co., Ltd.
InventorKil-Hyen Ryu
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Abstract
In a method of forming a beam, data signals and pilot signals are generated by despreading signals that are received by a plurality of antennas, the received signals including a modulated data signal and a modulated pilot signal, respectively. A first covariance matrix is calculated for the pilot signals. A second covariance matrix is calculated for averages of the pilot signals. A weight vector is calculated based on the first and second covariance matrices. A beam forming output signal for forming a beam is generated based on the data signals and the weight vectors. Therefore, an optimal beam may be accurately formed.
Claims10
A method of forming a beam by a beamforming apparatus in a communication system, the method comprising:
- generating demodulated data signals and demodulated pilot signals by despreading received signals received at a plurality of antennas, each of the received signals including a modulated data signal and a modulated pilot signal;
- calculating a first covariance matrix for the demodulated pilot signals generated at a first time;
- calculating a second covariance matrix for averages of accumulated demodulated pilot signals generated over a time interval;
- calculating a weight vector based on a difference between the first covariance matrix and second covariance matrix;
- and
- generating a beam forming output signal for forming a beam based on the demodulated data signals and the weight vector.
An apparatus for forming a beam, comprising:
- a despreading unit configured to generate a plurality of demodulated data signals and a plurality of demodulated pilot signals by despreading a plurality of received signals, wherein each of the received signals includes a modulated data signal and a modulated pilot signal;
- a weight calculator configured to calculate a first covariance matrix for the demodulated pilot signals generated at a first time, to calculate a second covariance matrix for averages of accumulated demodulated pilot signals generated over a time interval, and to calculate a weight vector based on a difference between the first covariance matrix and the second covariance matrix;
- and
- a beam forming unit configured to generate a beam forming output signal based on the demodulated data signals and the weight vector.
A communication system including an apparatus for forming a beam, comprising:
- a plurality of terminals configured to modulate data signals and pilot signals to generate transmitted signals, each including a modulated data signal and a modulated pilot signal;
- and
- a base station configured to generate a beam forming output signal for forming a beam, wherein the base station comprises,
- a plurality of antennas for receiving the transmitted signals as received signals;
- a despreading unit configured to generate a plurality of demodulated data signals and a plurality of demodulated pilot signals by despreading the received signals;
- a weight calculator configured to calculate a first covariance matrix for the demodulated pilot signals generated at a first time, to calculate a second covariance matrix for averages of accumulated demodulated pilot signals generated over a time interval, and to calculate a weight vector based on a difference between the first covariance matrix and the second covariance matrix;
- and
- a beam forming unit configured to generate the beam forming output signal for forming the beam using the demodulated data signals and the weight vector.
Dependencies are inferred from the claim text.