METHOD AND APPARATUS FOR REFERENCE SIGNAL DESIGN IN MIXED ANALOG/DIGITAL BEAM FORMING SYSTEM

摘要

PURPOSE: A method for producing standard signals in an analog/digital mixing beam forming system and a device thereof are provided to maximize mixed analogue/digital beam forming gains at a predetermined direction for a main analog/digital beam circumferential direction. CONSTITUTION: A base station determines an analog beam forming direction (505). The base station determines a digital beam forming direction for the determined analog beam forming direction (510). The base station determines a digital beam forming pre-coder for the determined analog/digital beam forming directions (515). The base station transmits down link reference signals for each analog beam forming direction (520). The base station receives a feedback from a terminal (525). [Reference numerals] (505) Determine an analog beam forming direction in advance; (510) Determine 2M + 1 digital beam forming directions for each analog beam forming direction; (515) Determine a digital beam forming pre-coder for each analog/digital beam forming direction; (520) Transmit down link reference signal for each analog beam forming direction, (A frequency domain allocates 1-2M+1 digital beam forming pre-coders N times for successive frequency resources (ex. Subcarrier)), (Frequency allocation information about 2M+1, N, and 2M+1 subcarriers is predetermined or broadcasted), (A base station notifies to a terminal whether a power boost is applied for a reference signal. And when the boost is applied, the terminal calculates signal power of each subcarrier based on the power of the received signal by using a power boot factor); (525) Receive a feedback from a terminal; (AA) Start; (BB) End