METHOD AND APPARATUS FOR MIXED ANALOG AND DIGITAL BEAM FORMING

摘要

PURPOSE: A method and apparatus for mixed analog and digital beam-forming are provided to execute a digital beam-forming process for compensating for other terminals except for a first terminal using an analog beam-forming pre-coder fixed in the first terminal. CONSTITUTION: A pre-processor(124) executes a digital beam-forming process by multiplying a digital beam-forming pre-coder by a second sub carrier. The digital beam-forming pre-coder determines an analog beam-forming pre-coder for compensating for a second sub carrier transmitted to a second receiver. The analog beam-forming pre-coder is optimized for a first sub carrier transmitted to a first received in a parallel symbol stream. An RF(Radio Frequency) chain executes an analog beam-forming process by multiplying an analog beam-forming pre-coder by an analog signal. The analog beam-forming pre-coder is transmitted to one or more RF paths. The analog beam-forming pre-coder is optimized for the first sub carrier. [Reference numerals] (100,102) Encoder; (110,112) Modulator; (120) Stream(M_t); (122) MIMO encoder; (124) Pre-processor; (170) Control unit; (AA) Chain 1; (BB) Chain 2; (CC) Each group includes D antennas; (DD) Phase shifter; (EE) Connection of a data path from an antenna 2 to an antenna D is identical; (FF) Antenna 1; (GG) Antenna D; (L) Layer