TRANSMIT BEAMFORMING APPARATUS IN AN OFDM BASED MULTIANTENNA WIRELESS SYSTEM IN WHICH A RECEIVER COMPARES ESTIMATED PRESENT CHANNEL INFORMATION WITH AN ACTUAL CHANNEL AND FEEDS BACK ONLY DIFFERENTIAL CHANNEL INFORMATION TO A TRANSMITTER

摘要

PURPOSE: A transmit beamforming method and apparatus in an OFDM based multiantenna wireless system are provided to reduce a feedback information quantity or the quantization error of a codebook. ;CONSTITUTION: A channel information estimator and a channel correlation information generator(201) estimates channel information from a pilot signal and deduces time and frequency channel correlation information from the estimated channel information. A beam weight estimator(205) estimates a beam weight for a present channel. A differential vector generation and quantization unit(207) quantizes a differential vector using a defined codebook.;COPYRIGHT KIPO 2011