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公开(公告)号：KR101400880B1
公开(公告)日：2014-05-29
申请号：KR1020120144582
申请日：2012-12-12
Applicant: 세종대학교산학협력단
CPC classification number: H04B7/0686 , H04L1/004 , H04L1/0656
Abstract: The present invention relates to a signal transmitting method using a hybrid MIMO-cooperative communications system and a signal transmitting apparatus thereof. The signal transmitting method using the hybrid MIMO-cooperative communications system according to an embodiment of the present invention comprises the steps of transmitting a first transmission signal including a CRC bit; receiving information on a channel state in accordance with an error of the CRC bit from a repeater; and transmitting a second transmission signal including at least one symbol between an STBC symbol and a V-BLAST symbol according to the received information on the channel state. Therefore, the present invention differentiates construction of the transmission signal according to the channel state in the hybrid MIMO-cooperative communications system, so may obtain a diversity gain and a multiplexing gain concurrently in the case that the channel state is good, and may increase the diversity gain and enhance signal reliability in the case that the channel state is not good.
Abstract translation: 本发明涉及使用混合MIMO协作通信系统的信号发送方法及其信号发送装置。 使用根据本发明的实施例的混合MIMO协作通信系统的信号发送方法包括以下步骤：发送包括CRC比特的第一发送信号; 根据来自中继器的CRC比特的错误，接收关于信道状态的信息; 以及根据接收到的关于信道状态的信息，发送包括STBC符号和V-BLAST符号之间的至少一个符号的第二传输信号。 因此，本发明根据混合MIMO协作通信系统中的信道状态来区分传输信号的结构，因此在信道状态良好的情况下可以同时获得分集增益和复用增益，并且可以增加 在信道状态不好的情况下，分集增益增强信号的可靠性。
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公开(公告)号：KR101541587B1
公开(公告)日：2015-08-03
申请号：KR1020130010500
申请日：2013-01-30
Applicant: 세종대학교산학협력단
Abstract: 본발명은 OFDM 심볼을재배열하여전송하는방법및 그장치에관한것이다. 본발명에따르면, 시간동기추정을위한 OFDM 심볼의재배열전송방법에있어서, 기설정된길이를가지는사용자데이터와훈련데이터를입력받는단계, 상기사용자데이터에대하여역푸리에변환(IFFT)을수행하는단계, 상기사용자데이터의일부분을복사하여상기사용자데이터의앞에위치하는보호구간(GI)에 Cyclic prefix(CP) 형태로붙여넣는단계, 상기보호구간(GI)의나머지부분에상기훈련데이터를배열시키는단계, 그리고상기보호구간(GI)과상기사용자데이터가결합된상기 OFDM 심볼을수신단으로전송하는단계를포함한다. 이와같이본 발명에따르면보호구간(GI)의잔여부분을최대한활용하기위하여, 보호구간(GI)의잔여구간에훈련데이터를삽입하여시간동기를추정함으로써, 매 OFDM 심볼마다낭비되는부분을효율적으로사용할수 있다. 또한종래의추정방법과달리별도의훈련데이터를사용하지않더라도시간동기추정과동시에사용자의데이터를전송할수 있다.
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公开(公告)号：KR101478469B1
公开(公告)日：2014-12-31
申请号：KR1020130153337
申请日：2013-12-10
Applicant: 세종대학교산학협력단
CPC classification number: H04B7/024 , H04B7/0626 , H04B7/0667 , H04B7/0854 , H04L1/0612 , H04L1/0656 , H04L27/26
Abstract: The present invention relates to an apparatus for controlling an OFDM-based base station cooperative communications and a method thereof. The controlling apparatus according to the present invention includes: a first control unit to transmit control signal to a first cellular base station so that a first signal transmitted from a broadcasting base station is modulated into a STBC type and transmitted to a user terminal when a user terminal having plurality of antennas is within a communications range of the first cellular base station; a comparison unit to compare a channel state value between the user terminal and the broadcasting base station with a threshold value, which is fed back from the user terminal, when the user terminal moves into a region where communications ranges of the first cellular base station and the second cellular base station are overlapped; a second controller to send a control signal to the second cellular base station so that a second signal, which is different from the first signal, is modulated and transmitted to the user terminal when the channel state value is at least the threshold value, and a first signal is modulated and transmitted to the user terminal when the channel state value is less than the threshold value. According to the present invention, by using a cooperative communications between the plurality of cellular base stations and the broadcasting base stations, a high reliability communications is possible due to a diversity gain. In addition, a transmission rate can be improved based on the reliability.
Abstract translation: 本发明涉及一种用于控制基于OFDM的基站协作通信的装置及其方法。 根据本发明的控制装置包括：第一控制单元，用于向第一蜂窝基站发送控制信号，使得从广播基站发送的第一信号被调制成STBC类型，并且当用户发送到用户终端时 具有多个天线的终端位于第一蜂窝基站的通信范围内; 比较单元，用于当用户终端移动到第一蜂窝基站和第一蜂窝基站的通信范围的区域中时，用户终端和广播基站之间的信道状态值与从用户终端反馈的阈值进行比较， 第二蜂窝基站重叠; 第二控制器，当信道状态值至少为阈值时，向第二蜂窝基站发送控制信号，使得与第一信号不同的第二信号被调制并发送给用户终端， 当信道状态值小于阈值时，第一信号被调制并发送到用户终端。 根据本发明，通过使用多个蜂窝基站和广播基站之间的协作通信，由于分集增益，高可靠性通信是可能的。 此外，可以基于可靠性提高传输速率。
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公开(公告)号：KR1020140097859A
公开(公告)日：2014-08-07
申请号：KR1020130010500
申请日：2013-01-30
Applicant: 세종대학교산학협력단
CPC classification number: H04L27/2662 , H04L27/2607 , H04L27/2666 , H04W56/001
Abstract: The present invention relates to a method and an apparatus to rearrange and transmit an OFDM symbol. According to the present invention, the method to rearrange and transmit an OFDM symbol for a time synchronization estimation comprises the steps of: receiving user data and training data having a preset length; performing an inverse fast Fourier transform (IFFT) on the user data; copying a part of the user data and pasting the copied part to a guard interval (GI) located in front of the user data in a cyclic prefix (CP) form; arranging the training data in the remaining part of the guard interval (GI); and transmitting the OFDM symbol, whereby the guard interval (GI) and the user data are combined, to a receiving terminal. According to the present invention, in order to maximally use the remaining part of the guard interval (GI), time synchronization is estimated by inserting the training data into the retaining part of the guard interval (GI), thereby efficiently using the wasted part with respect to each OFDM symbol. Also, unlike a conventional estimation method, the user data can be transmitted at the same time as the time synchronization estimation even if separate training data is not used.
Abstract translation: 本发明涉及重排和发送OFDM符号的方法和装置。 根据本发明，用于重新排列和发送用于时间同步估计的OFDM符号的方法包括以下步骤：接收具有预设长度的用户数据和训练数据; 对用户数据执行快速傅立叶逆变换（IFFT）; 复制一部分用户数据并将复制的部分以循环前缀（CP）形式粘贴到位于用户数据前面的保护间隔（GI）; 将训练数据安排在保护间隔（GI）的剩余部分中; 并且发送OFDM符号，由此将保护间隔（GI）和用户数据组合到接收终端。 根据本发明，为了最大限度地利用保护间隔（GI）的剩余部分，通过将训练数据插入到保护间隔（GI）的保持部分来估计时间同步，从而有效地将浪费的部分与 对于每个OFDM符号。 此外，与传统的估计方法不同，即使不使用单独的训练数据，也可以与时间同步估计同时发送用户数据。
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