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公开(公告)号：KR101092686B1
公开(公告)日：2011-12-09
申请号：KR1020100001826
申请日：2010-01-08
Applicant: 서울대학교산학협력단
CPC classification number: H04B7/0639 , H04B7/0641 , H04B7/0663 , H04L5/0023 , H04L25/0204 , H04L25/022 , H04L25/0224 , H04L25/03949
Abstract: 본발명은, 직교주파수분할다중접속(orthogonal frequency division multiplexing: 이하 OFDM) 기반다중안테나시스템에서송신빔포밍(transmit beamforming) 을위한채널정보를궤환(feedback)함에있어, 이전의채널정보와주파수축의부반송파(sub-carrier) 및시간축의심볼(symbol)들간의채널상관(channel correlation)정보를이용하여현재채널정보와의차등정보를송신기(transmitter)에궤환하여최적의빔 가중치(beamforming weight)를생성하는방법및 장치에관한것으로서, 수신기가이전채널정보와의주파수및 시간상관정보와각각에대한이전채널정보를기반으로현재채널과의차등정보를추정하는과정과, 추정된정보와실제채널사이의차등정보를송신단에궤환하는과정과, 송신기가이전에궤환받은채널정보와새롭게궤환된차등정보로부터최적의빔 가중치를생성하는과정을포함하는것을특징으로한다. 본발명은종래의코드북(codebook) 기반으로채널정보를궤환하는데따른양자화오차및 궤환신호량부담(feedback signaling overhead)를줄일수 있으며, 특히채널의주파수및 시간상관이큰 환경에서큰 이득을얻을수 있게된다.
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公开(公告)号：KR1020110081592A
公开(公告)日：2011-07-14
申请号：KR1020100001826
申请日：2010-01-08
Applicant: 서울대학교산학협력단
CPC classification number: H04B7/0639 , H04B7/0641 , H04B7/0663 , H04L5/0023 , H04L25/0204 , H04L25/022 , H04L25/0224 , H04L25/03949 , H04B7/0617 , H04L27/2695
Abstract: 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.
Abstract translation: 目的：提供基于OFDM的多天线无线系统中的发射波束形成方法和装置，以减少码本的反馈信息量或量化误差。 构成：信道信息估计器和信道相关信息生成器（201）从导频信号估计信道信息，并从所估计的信道信息推断出时间和频率信道相关信息。 光束权重估计器（205）估计当前信道的光束权重。 差分矢量生成和量化单元（207）使用定义的码本对差分矢量进行量化。
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