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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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Patent Agency Ranking2.发明公开
公开(公告)号：KR1020120121733A
公开(公告)日：2012-11-06
申请号：KR1020110039702
申请日：2011-04-27
Applicant: 서울대학교산학협력단
IPC: H04L27/26
CPC classification number: H04L27/2614 , H04L27/2628
Abstract: PURPOSE: A method and apparatus for reducing a peak to average power ratio in an orthogonal frequency division multiplexing system using additional mapping sequences are provided to generate an alternative signal sequence by performs IFFT(inverse fast Fourier transform) of sub blocks and an additional mapping symbol sub block and then linearly coupling the sub blocks and the additional mapping symbol sub block in a time domain. CONSTITUTION: A sub block partition part(410) partitions an OFDM symbol sequence into two or more sub blocks. An additional mapping symbol sub block generating part(420) generates additional mapping symbol sub blocks which corresponds to each sub block. An IFFTpart(430) performs IFFT of sub blocks and the additional mapping symbol sub blocks. An alternative signal sequence generation part(440) generates alternative signal sequences using signal subsequences and additional mapping signal subsequences. A minimum PAPR(peak to average power ratio) selecting part(450) selects the alternative signal sequence corresponding to minimum PAPR.
Abstract translation: 目的：提供一种在使用附加映射序列的正交频分复用系统中降低峰值与平均功率比的方法和装置，以通过执行子块的IFFT（快速傅里叶逆变换）和附加映射符号来产生替代信号序列 然后在时域中对子块和附加映射符号子块进行线性耦合。 构成：子块分割部分（410）将OFDM符号序列划分成两个或更多个子块。 附加的映射符号子块生成部分（420）生成对应于每个子块的附加映射符号子块。 IFFT部分（430）执行子块和附加映射符号子块的IFFT。 替代信号序列生成部分（440）使用信号子序列和附加映射信号子序列来生成备选信号序列。 最小PAPR（峰值与平均功率比）选择部分（450）选择对应于最小PAPR的替代信号序列。
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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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4.发明授权
公开(公告)号：KR101215932B1
公开(公告)日：2012-12-28
申请号：KR1020110039702
申请日：2011-04-27
Applicant: 서울대학교산학협력단
IPC: H04L27/26
Abstract: 직교주파수분할다중화시스템의 PAPR 감소방법및 이를위한직교주파수분할다중화시스템통신장치가개시된다. 본발명의일실시예에따른직교주파수분할다중화시스템의 PAPR 감소방법은, OFDM 심볼시퀀스를둘 이상의서브블록들로파티션하는단계; 상기서브블록들각각에대응하는부가적맵핑심볼서브블록을생성하는단계; 상기서브블록들및 상기부가적맵핑심볼서브블록을역 고속푸리에변환하여신호서브시퀀스및 부가적맵핑신호서브시퀀스를생성하는단계; 상기신호서브시퀀스및 부가적맵핑신호서브시퀀스를이용하여후보신호시퀀스들을생성하는단계; 및상기후보신호시퀀스들중 최소 PAPR에상응하는후보신호시퀀스를선택하는단계를포함한다.
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5.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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6.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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