Wireless Communication system with feedback and method therefor
First Claim
1. A wireless communication system including a plurality of transmitting antennas and a plurality of receiving antennas through which signals are transmitted and received, the wireless communication system comprising:
- a transmitter that restores feedback information from a predetermined feedback signal, weights an information signal with the restored feedback information, and converts the weighted information signal to a radio frequency signal in order to transmit the radio frequency signal; and
a receiver that receives the radio frequency signal to estimate the state of a channel through which the radio frequency signal is transmitted, calculates a weight of a dimensionality corresponding to the number of the transmitting antennas, approximates the weight as lower-dimensional one to extract feedback information, and converts the feedback information into a radio frequency signal to send the radio frequency signal to the transmitter.
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Abstract
A wireless communication system with feedback and a method therefore, wherein the wireless communication system, which has a plurality of transmitting antennas and a plurality of receiving antennas through which signals are transmitted and received, respectively, includes: a transmitter that restores feedback information from a predetermined feedback signal, weights an information signal with the restored feedback information, and converts the weighted information signal to a radio frequency signal in order to transmit the radio frequency signal; and a receiver that receives the radio frequency signal to estimate the state of a channel, through which the radio frequency signal is transmitted, calculates a weight of a dimensionality corresponding to the number of the transmitting antennas, approximates the weight as lower-dimensional one to extract feedback information, and converts the feedback information into a radio frequency signal to send the radio frequency signal to the transmitter.
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Citations
20 Claims
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1. A wireless communication system including a plurality of transmitting antennas and a plurality of receiving antennas through which signals are transmitted and received, the wireless communication system comprising:
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a transmitter that restores feedback information from a predetermined feedback signal, weights an information signal with the restored feedback information, and converts the weighted information signal to a radio frequency signal in order to transmit the radio frequency signal; and
a receiver that receives the radio frequency signal to estimate the state of a channel through which the radio frequency signal is transmitted, calculates a weight of a dimensionality corresponding to the number of the transmitting antennas, approximates the weight as lower-dimensional one to extract feedback information, and converts the feedback information into a radio frequency signal to send the radio frequency signal to the transmitter. - View Dependent Claims (2, 3, 4, 5, 19, 20)
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6. A wireless communication system including a plurality of transmitting antennas and a plurality of receiving antennas through which signals are transmitted and received, respectively, the wireless communication system comprising:
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a transmitter that restores feedback information from a predetermined feedback signal, weights an information signal with the restored feedback information, and converts the weighted information signal into a radio frequency signal in order to transmit the radio frequency signal; and
a receiver that receives the radio frequency signal to estimate the state of a channel through which the radio frequency signal is transmitted, selects a number of basis vectors and their coefficients corresponding to the dimensionality of approximation among the basis vectors whose number corresponds to the number of the transmitting antennas, obtains a plurality of weights from the selected basis vectors and coefficients, extracts a weight that maximizes a predetermined objective function obtained from the channel state among the plurality of weights as feedback information, and converts the feedback information into a radio frequency signal in order to send the radio frequency signal to the transmitter. - View Dependent Claims (7, 8)
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9. A wireless communication method in which, when M radio frequency signals transmitted from a transmitter are received through multiple paths, feedback information is extracted from the received signals and the feedback information is sent to the transmitter, the method comprising the steps of:
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(a) estimating states of channels comprising the multiple paths from the received signals;
(b) calculating a weight, which is fed back into the transmitter and multiplied by the M radio frequency signals, from the channel state;
(c) approximating the weight as dimension S which is less than M and quantizing coefficients for the approximated dimension; and
(d) feeding basis vectors and their quantized coefficients of the approximated dimension, or indices that identify the basis vectors and their quantized coefficients, back to the transmitter. - View Dependent Claims (10, 11, 12, 13)
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14. A wireless communication method in which, when M radio frequency signals transmitted from a transmitter are received through multiple paths, feedback information is extracted from the received signals and the feedback information is sent to the transmitter, the method comprising the steps of:
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(a) estimating states of channels comprising the multiple paths from the received signals;
(b) determining basis vectors that represent M dimensions;
(c) selecting S basis vectors among the determined basis vectors where S is less than M;
(d) selecting one of N quantization coefficients for each basis vector;
(e) obtaining feedback information Wi from the selected basis vectors and quantization coefficients; and
(f) sending Wi or an index indicating Wi back to the transmitter if a predetermined objective function Pi generated from Wi and the estimated channel H reaches a maximum. - View Dependent Claims (15, 16, 17, 18)
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Specification