Abstract:
PURPOSE: A method for controlling the charge of a battery of terminal capable of reducing the cost and a system therefor are provided to use a linear charger, thereby implementing the quick charge. CONSTITUTION: A battery (200) is mounted on a terminal (100). A battery charger (300) is connected to the terminal. The battery charger provides a charging current. The battery charger charges the battery with electricity to the maximum margin current value. The maximum margin current value is greater than the rated current value.
Abstract:
PURPOSE: A codebook generating method for a multi-polarized MIMO(Multiple Input Multiple Output) system and a device thereof are provided to generate a pre-coding matrix for a case including multi-polarized antennas using a single sending pre-coding matrix. CONSTITUTION: A pre-coding matrix reconfiguration unit(540) reconfigures a pre-coding matrix by selecting one or more line vectors included in the pre-coding matrix according to a transmission ranking corresponding to the number of data streams. A rotary pre-coding matrix generating unit(550) generates a reconfiguration matrix by arranging the line vectors included in the pre-coding matrix. The rotary pre-coding matrix generating unit generates a rotary pre-coding matrix by using a rotary matrix and a rearrangement matrix. A phase control unit(560) controls a phase of components included in the rearrangement matrix by using a diagonal matrix. [Reference numerals] (510) Single polarization pre-coding matrix allocating unit; (520) Zero matrix allocating unit; (530) Pre-coding matrix generating unit; (540) Pre-coding matrix reconfiguration unit; (550) Rotary pre-coding matrix generating unit; (560) Phase control unit;
Abstract:
An apparatus and a method for generating a pre-coding matrix codebook are provided to expand a vector-based codebook to a pre-coding matrix codebook adaptable to a multi-rank system. A matrix group generator(110) generates a first group of unitary matrices, based on a vector-based codebook for pre-coding of a MIMO(Multiple Input Multiple Output) communication scheme. A matrix group expander(120) expands the first group of unitary matrices to generate a second group of unitary matrices. A matrix group selector(130) generates a group of columns corresponding to a communication rank from each unitary matrix of the second group. Herein, the selected columns are optimized based on a distance between the columns corresponding to the communication rank. The matrix group expander generates the second group so that a first column of a unitary matrix of the second group is identical to a first column of a unitary matrix of the first group and the other columns of the unitary of the second group are orthogonal to the first column of the unitary matrix of the first group.