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Patent Agency Ranking1.发明授权
公开(公告)号：KR101067644B1
公开(公告)日：2011-09-27
申请号：KR1020090020409
申请日：2009-03-10
Applicant: 서울대학교산학협력단
Abstract: 본 발명은 부분 비트 반전 선택 사상 기법을 이용한 직교 주파수 분할 다중화 시스템의 최대전력 대 평균전력의 비 감소방법에 대한 것으로서, 본 발명은 직교 주파수 분할 다중 시스템에서 최대전력 대 평균전력의 비를 감소시키는 방법에 있어서, 입력된 소정 길이의 데이터에 대한 2진수의 입력 심볼 시퀀스를 구하고 상기 2진수의 입력 심볼 시퀀스의 위상 및 크기를 변화시키기 위한 변이 시퀀스를 생성하여, 상기 입력 심볼 시퀀스에 상기 변이 시퀀스를 곱하여 대안 OFDM 심볼 시퀀스를 산출하고 이를 근거로 가장 적은 PAPR을 선택하는 것을 특징으로 하는 직교 주파수 분할 다중화 시스템의 최대전력 대 평균전력의 비 감소방법이며, 본 발명에 의하면 OFDM 신호가 변조된 QAM에서 PAPR을 저감시킨다.
OFDM, PAPR, SLM, 선택적 맵핑, 쉐이핑 게인, PBISLM.Abstract translation: 目的：提供一种降低正交频分复用（OFDM）系统的最大功率 - 平均功率比的方法，通过反转部分位的一部分来执行。 构成：串行到并行转换器（120）从信息发生器（110）获得与输入信号相关的数据。 串并转换器输出并行数据块。 数据块处理器（130）计算替代符号序列。 逆快速傅里叶变换转换器（140）对所计算的替代符号序列进行快速傅立叶逆变换。 序列选择器（150）提取替代的OFDM信号序列并通过发射机发送序列（160）。
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2.发明公开
公开(公告)号：KR1020100101952A
公开(公告)日：2010-09-20
申请号：KR1020090020409
申请日：2009-03-10
Applicant: 서울대학교산학협력단
CPC classification number: H04L5/0007 , H04J11/0036 , H04L27/2628 , H04L27/263 , H04L27/2634 , H04L27/3494
Abstract: PURPOSE: A method for reducing the maximum power-to-average power ratio of an orthogonal frequency-division multiplexing(OFDM) system is provided to be performed by reversing a part of partial bit. CONSTITUTION: A serial-to-parallel converter(120) obtains data related to an input signal from an information generator(110). The serial-to-parallel converter outputs parallel data blocks. A data block processor(130) calculates alternative symbol sequence. An inverse fast Fourier transform converter(140) inverse-fast-Fourier transforms the calculated alternative symbol sequence. A sequence selector(150) extracts an alternative OFDM signal sequence and transmits the sequence through a transmitter(160).
Abstract translation: 目的：提供一种降低正交频分复用（OFDM）系统的最大功率 - 平均功率比的方法，通过反转部分位的一部分来执行。 构成：串行到并行转换器（120）从信息发生器（110）获得与输入信号相关的数据。 串并转换器输出并行数据块。 数据块处理器（130）计算替代符号序列。 逆快速傅里叶变换转换器（140）对所计算的替代符号序列进行快速傅立叶逆变换。 序列选择器（150）提取替代的OFDM信号序列并通过发射机发送序列（160）。
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公开(公告)号：KR101060548B1
公开(公告)日：2011-08-31
申请号：KR1020100047552
申请日：2010-05-20
Applicant: 서울대학교산학협력단
IPC: H04L27/26
CPC classification number: H04L27/2614 , H04L27/2628
Abstract: PURPOSE: An apparatus for reducing a Peak-to-Average Power Ratio in an Orthogonal Frequency Division Multiplexing system and a method thereof are provided to create a plurality of candidate signals which has the different PAPR by applying circular shift to signals of an intermediate phase in an Inverse Fast Fourier Transform shift. CONSTITUTION: An input symbol sequence is inputted. The inputted input symbol sequence is processed to a (n-i) stage of an IFFT part(340). An intermediate OFDM signal sequence is created. The intermediate OFDM signal sequence is transmitted to IFFT blocks(341,342) of the different U. The intermediate OFDM signal sequence is rotationally transported by different movement values which is pre-set at each the IFFT block. The intermediate OFDM signal sequence is processed the IFFT to a rest n stage. A plurality of OFDM signal sequences with different PAPRs is created.
Abstract translation: 目的：提供一种用于降低正交频分复用系统中的峰均功率比的装置及其方法，用于通过向中间相的信号施加循环移位来创建具有不同PAPR的多个候选信号 快速傅里叶逆变换。 构成：输入符号序列。 输入的输入符号序列被处理为IFFT部分（340）的（n-i）级。 创建中间OFDM信号序列。 中间OFDM信号序列被发送到不同U的IFFT块（341,342）。中间OFDM信号序列由在每个IFFT块预置的不同移动值被旋转地传输。 中间OFDM信号序列被处理为休眠n阶段的IFFT。 创建具有不同PAPR的多个OFDM信号序列。
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公开(公告)号：KR1020130033981A
公开(公告)日：2013-04-04
申请号：KR1020120107145
申请日：2012-09-26
Applicant: 서울대학교산학협력단
IPC: H04L27/26
CPC classification number: H04L27/2647 , H04L27/265
Abstract: PURPOSE: A receiver in an OFDMA(Orthogonal Frequency Division Multiple Access) system and a signal processing method thereof are provided to reduce the power consumption of a terminal. CONSTITUTION: An extracting unit(440) extracts a user signal vector about a sub-carrier allocated to a receiver from a reception signal vector received from a transmitter. An FFT(Fast Fourier Transform) unit(450) performs FFT of the user signal vector. The extracting unit extracts the user signal vector by a circular convolution of the reception signal vector and the extracted user signal vector. [Reference numerals] (410) Sampling unit; (420) A/D conversion unit; (430) S/P conversion unit; (440) Extracting unit; (450) FFT unit; (460) Symbol extracting unit;
Abstract translation: 目的：提供OFDMA（正交频分多址）系统中的接收机及其信号处理方法，以减少终端的功耗。 构成：提取单元（440）从从发送器接收的接收信号向量提取关于分配给接收机的子载波的用户信号向量。 FFT（快速傅里叶变换）单元（450）执行用户信号矢量的FFT。 提取单元通过接收信号向量和所提取的用户信号向量的循环卷积提取用户信号向量。 （附图标记）（410）取样单元; （420）A / D转换单元; （430）S / P转换单元; （440）提取单元; （450）FFT单元; （460）符号提取单元;
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公开(公告)号：KR1020100080720A
公开(公告)日：2010-07-12
申请号：KR1020090000140
申请日：2009-01-02
Applicant: 서울대학교산학협력단
CPC classification number: H04L27/2614
Abstract: PURPOSE: A blind SLM(Selected Mapping) method is provided to reduce encoding complexity and minimize the performance degradation of a BER(Bit Error Rate). CONSTITUTION: A transmission end selects a symbol sequence which has the smallest PAPR among OFDM carrier wave symbol sequences. The transmission end partitions the OFDM carrier wave symbol sequences into a constant period. A sectional phase is rotated according to the m-sequence which is used every OFDM carrier wave symbol sequence.
Abstract translation: 目的：提供盲SLM（选择映射）方法以降低编码复杂度并最大限度地降低BER（误码率）的性能下降。 构成：发送端选择OFDM载波符号序列中PAPR最小的符号序列。 发送端将OFDM载波符号序列划分成恒定周期。 根据每个OFDM载波符号序列使用的m序列旋转截面相位。
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