Semi-blind transmit antenna array device using feedback information and method thereof in a mobile communication system

A mobile station device for receiving a forward information signal in a plurality of paths according to a communication environment from an antenna array having a plurality of antennas in a base station, comprising:

• a receiver for receiving forward information signals from the plurality of paths with respect to the forward information signal transmitted from the base station;
• a forward processor for extracting forward fading power information signals for the plurality of paths from the received forward information signals;
• and
• a transmitter for multiplexing a transmission message signal with the forward fading power information signals received from the forward processor.

A base station device having an antenna array, for receiving forward fading information from a mobile station in a mobile communication system, comprising:

• a reverse processor for processing a reverse signal received through the antenna array;
• a forward fading information extraction unit for extracting forward fading information from the received reverse signal;
• a beam formation controller for generating a weight vector for formation of a transmission beam using the forward fading information and the received reverse signal;
• and
• a forward processor having a transmission beam generator for generating a transmission beam for a transmission message based on the weight vector.

A mobile station device in a mobile communication system, comprising:

• a forward processor for processing a received forward signal;
• a forward fading estimator for estimating forward fading information of the forward signal for each path;
• a forwarding fading encoder for combining the estimated forward fading information and encoding the combined forward fading information;
• and
• a reverse processor for multiplexing the encoded forward fading information with a transmission message and feeding back the forward fading information in the multiplexed signal to a base station.

A transmitting method for a base station that has an antenna array and received forward fading information from a mobile station in a mobile communication system, comprising the steps of processing a reverse signal received through the antenna array;

• extracting forward fading information from the processed reverse signal;
• generating a weight vector using the forward fading information and the received reverse signal;
• and
• forming a transmission beam for a transmission message based on the weight vector.

A communication method for a mobile station in a mobile communication system, comprising the steps of:

• processing a received forward signal;
• estimating forward fading information of the forward signal for each path;
• combining the estimated forward fading information and encoding the combined forward fading information;
• and
• multiplexing the encoded forward fading information with a transmission message and feeding back the forward fading information in the multiplexed signal to a base station.

A communication method between a base station having an antenna array and a mobile station, comprising the steps of:

• estimating forward fading information of a forward signal received from the base station for each path, combining the estimated forward fading information, encoding the combined forward fading information, and feeding back the encoded forward fading information to the base station in the mobile station;
• extracting the forward fading information and generating a weight vector using the extracted forward fading information in the base station;
• and
• forming a transmission beam for a transmission message based on the weight vector and outputting the transmission beam through the antenna array in the base station.

A base station device that has an antenna array and received forward fading information from a mobile station in a mobile communication system, comprising:

• a reverse processor for processing a reverse signal received through the antenna array;
• a forward fading information extraction unit for extracting forward fading information from the received reverse signal;
• a forward fading power calculator for calculating a forward fading power for each path based on the extracted forward fading information;
• an array vector calculator for calculating an array vector for each path from the reverse signal;
• a transmission correlation matrix calculator for calculating a transmission correlation matrix using the forward fading powers and the array vectors;
• a weight vector calculator for calculating a weight vector from the transmission correlation matrix, updating an existing weight vector with the calculated weight vector, and outputting the updated weight vector as a control signal to a transmission beam generator;
• and
• a forward processor comprising the transmission beam generator for generating a transmission beam for a transmission message based on the weight vector.

A base station device that has an antenna array and received forward fading information from a mobile station in a mobile communication system, comprising:

• a reverse processor for processing a reverse signal received through the antenna array;
• a forward fading information extraction unit for extracting forward fading information from the received reverse signal;
• a forward fading power calculator for calculating an average reverse fading power and a Doppler frequency from the received reverse signal and calculating a current forward fading power for each path by a predetermined prediction method based on a plurality of previous forward fading coefficients for each path, the average reverse fading power, and the Doppler frequency;
• an array vector calculator for calculating an array vector for each path from the reverse signal;
• a transmission correlation matrix calculator for calculating a transmission correlation matrix using the forward fading powers and the array vectors;
• a weight vector calculator for calculating a weight vector from the transmission correlation matrix, updating an existing weight vector with the calculated weight vector, and outputting the updated weight vector as a control signal to a transmission beam generator;
• and
• a forward processor comprising the transmission beam generator for generating a transmission beam for a transmission message based on the weight vector.

A base station device that has an antenna array and received forward fading information from a mobile station in a mobile communication system, comprising:

• a reverse processor for processing a reverse signal received through the antenna array;
• a forward fading information extraction unit for extracting forward fading information from the received reverse signal;
• a forward fading power calculator for calculating forward fading power for each path based on the extracted forward fading information, calculating an average reverse fading power from the reverse signal, and selecting the forward fading power if the mobility of the mobile station is lower than a predetermined threshold and the average reverse fading power if the mobility of the mobile station is greater than the threshold;
• an array vector calculator for calculating an array vector for each path from the reverse signal;
• a transmission correlation matrix calculator for calculating a transmission correlation matrix using the forward fading powers and the array vectors;
• a weight vector calculator for calculating a weight vector from the transmission correlation matrix, updating an existing weight vector with the calculated weight vector, and outputting the updated weight vector as a control signal to a transmission beam generator;
• and
• a forward processor comprising the transmission beam generator for generating a transmission beam for a transmission message based on the weight vector.

A base station device that has an antenna array and received forward fading information from a mobile station in a mobile communication system, comprising:

• a reverse processor for processing a reverse signal received through the antenna array;
• a forward fading information extraction unit for extracting forward fading information from the received reverse signal;
• a forward fading power calculator for calculating an average reverse fading power and a Doppler frequency from the received reverse signal, calculating a current forward fading power for each path by a predetermined prediction method based on a plurality of previous forward fading coefficients for each path, the average reverse fading power, and the Doppler frequency, and selecting the forward fading power if the mobility of the mobile station is lower than a predetermined threshold and the average reverse fading power if the mobility of the mobile station is greater than the threshold;
• an array vector calculator for calculating an array vector for each path from the reverse signal;
• a transmission correlation matrix calculator for calculating a transmission correlation matrix using the forward fading powers and the array vectors;
• a weight vector calculator for calculating a weight vector from the transmission correlation matrix, updating an existing weight vector with the calculated weight vector, and outputting the updated weight vector as a control signal to a transmission beam generator;
• and
• a forward processor comprising the transmission beam generator for generating a transmission beam for a transmission message based on the weight vector.

A forward signal transmitting method for a base station that has an antenna array and received forward fading information from a mobile station in a mobile communication system, comprising the steps of extracting forward fading information from a reverse signal received through the antenna array;

• calculating a forward fading power for each path based on the extracted forward fading information;
• calculating an array vector for each path from the reverse signal;
• calculating a weight vector based on the forward fading powers and array vectors and updating an existing weight vector with the calculated weight vector;
• and
• forming a transmission beam for a transmission message based on the weight vector and outputting the transmission beam through the antenna array.

A forward signal transmitting method for a base station device that has an antenna array and received forward fading information from a mobile station in a mobile communication system, comprising the steps of:

• extracting forward fading information from a reverse signal received through the antenna array and storing the extracted forward fading information;
• calculating an average reverse fading power and a Doppler frequency from the received reverse signal and calculating a current forward fading power for each path by a predetermined prediction method based on a plurality of previous forward fading coefficients for each path, the average reverse fading power, and the Doppler frequency;
• calculating an array vector for each path from the reverse signal;
• calculating a weight vector based on the forward fading powers and array vectors and updating an existing weight vector with the calculated weight vector;
• and
• forming a transmission beam for a transmission message based on the weight vector and outputting the transmission beam through the antenna array.

A forward signal transmitting method for a base station device that has an antenna array and received forward fading information from a mobile station in a mobile communication system, comprising the steps of

• extracting forward fading information from a reverse signal received through the antenna array;
• calculating forward fading power for each path based on the extracted forward fading information, calculating an average reverse fading power from the reverse signal, and selecting the forward fading power if the mobility of the mobile station is lower than a predetermined threshold and the average reverse fading power if the mobility of the mobile station is greater than the threshold;
• calculating an array vector for each path from the reverse signal;
• calculating a weight vector based on the forward fading powers and array vectors and updating an existing weight vector with the calculated weight vector;
• and
• forming a transmission beam for a transmission message based on the weight vector and outputting the transmission beam through the antenna array.

A forward signal transmitting method for a base station device that has an antenna array and received forward fading information from a mobile station in a mobile communication system, comprising the steps of

• extracting forward fading information from a reverse signal received through the antenna array;
• calculating an average reverse fading power and a Doppler frequency from the received reverse signal, calculating a current forward fading power for each path by a predetermined prediction method based on a plurality of previous forward fading coefficients for each path, the average reverse fading power, and the Doppler frequency, and selecting the forward fading power if the mobility of the mobile station is lower than a predetermined threshold and the average reverse fading power if the mobility of the mobile station is greater than the threshold;
• calculating an array vector for each path from the reverse signal;
• calculating a weight vector based on the forward fading powers and array vectors and updating an existing weight vector with the calculated weight vector;
• and
• forming a transmission beam for a transmission message based on the weight vector and outputting the transmission beam through the antenna array.