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公开(公告)号：KR1020040032021A
公开(公告)日：2004-04-14
申请号：KR1020020061332
申请日：2002-10-08
Applicant: 삼성전자주식회사
IPC: H04J11/00
CPC classification number: H04L27/2607
Abstract: PURPOSE: An apparatus and a method for inserting/removing a protection block of an OFDM communication system are provided to enhance the performance of time synchronization by inserting pilot data streams. CONSTITUTION: An apparatus for inserting/removing a protection block of an OFDM communication system includes a protection block insertion unit(530) and a selection unit(590). The protection block insertion unit(530) copies block data of predetermined positions from received data streams and inserts the copied block data into a predetermined protection block of the received data streams. The selection unit(590) inputs selectively output data streams of the protection block insertion unit and particular words having a non-periodical autocorrelation characteristic and outputs OFDM symbols. The OFDM symbols are formed by inserting the particular words into the output data streams. The apparatus for inserting/removing the protection block of the OFDM communication system further includes a buffer(570) for storing the particular words and a control unit(580) for controlling a selective input operation of the selection unit(590).
Abstract translation: 目的：提供一种用于插入/去除OFDM通信系统的保护块的装置和方法，以通过插入导频数据流来增强时间同步的性能。 构成：用于插入/去除OFDM通信系统的保护块的装置包括保护块插入单元（530）和选择单元（590）。 保护块插入单元（530）从接收到的数据流中复制预定位置的块数据，并将复制的块数据插入到接收的数据流的预定保护块中。 选择单元（590）选择性地输入保护块插入单元的输出数据流和具有非周期自相关特性的特定字，并输出OFDM符号。 通过将特定单词插入到输出数据流中来形成OFDM符号。 用于插入/去除OFDM通信系统的保护块的装置还包括用于存储特定字的缓冲器（570）和用于控制选择单元（590）的选择性输入操作的控制单元（580）。
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公开(公告)号：KR100576010B1
公开(公告)日：2006-05-02
申请号：KR1020020061332
申请日：2002-10-08
Applicant: 삼성전자주식회사
IPC: H04J11/00
CPC classification number: H04L27/2607
Abstract: 직교주파수분할다중(OFDM) 방식을 사용하는 시스템에서 정확한 심볼 동기 획득을 가능하게 하고, 주파수 편차 및 채널 추정 성능을 높이는 송수신 장치 및 방법이 개시되어 있다. 이러한 본 발명의 실시예에 따른 송신 장치는 보호구간 삽입부를 포함한다. 상기 보호구간 삽입부는 송신을 위해 입력되는 데이터열중 미리 설정된 위치의 구간 데이터들을 복사하고, 상기 복사된 구간 데이터들을 상기 입력 데이터열의 미리 설정된 보호구간 위치에 삽입한다. 선택부는 상기 보호구간 삽입부의 출력 데이터열과 진폭이 일정하고 비주기적 자기상관 특성을 가지는 특정 워드들을 선택적으로 입력하고, 상기 출력 데이터열에 상기 특정 워드들이 삽입된 OFDM 심볼을 출력한다.
OFDM, 보호구간, 특정 워드들, 데이터열-
公开(公告)号：KR1020040029253A
公开(公告)日：2004-04-06
申请号：KR1020030067603
申请日：2003-09-29
Applicant: 삼성전자주식회사
IPC: H04J11/00
CPC classification number: H04L27/2605 , H04L5/0048 , H04L25/0226 , H04L27/262 , H04L27/2655
Abstract: PURPOSE: An apparatus and a method for generating a preamble sequence in a communication system by using an orthogonal frequency division(OFDM) method are provided to improve the preamble sequence characteristics by proposing the preamble sequence having a minimum peak to average power ratio(PAPR). CONSTITUTION: A method for generating a preamble sequence in a communication system by using an orthogonal frequency division(OFDM) method includes the steps of: dividing the n number of sub-carrier waves being smaller than the m number of sub-carrier waves so as to allocate p number of partial channels; and performing the inverse fast Fourier transformation after the null data is allocated to the sub-carrier wave except the n number of sub-carrier waves allocated to the partial channel, the data of the given sequence is allocated to at least one partial channel selected among the p number of partial channels and the null data is allocated to the partial channel which is not selected among the p number of partial channel.
Abstract translation: 目的：提供一种通过使用正交频分（OFDM）方法在通信系统中生成前置码序列的装置和方法，通过提出具有最小峰均功率比（PAPR）的前导序列来改善前导码序列特性， 。 构成：通过使用正交频分（OFDM）方法在通信系统中生成前置码序列的方法包括以下步骤：将n个副载波分成小于m个子载波数，以便 分配p个部分信道; 并且在将零数据分配给除了分配给部分信道的n个子载波之外的子载波之后执行快速傅立叶逆变换，将给定序列的数据分配给至少一个部分信道，该部分信道选自 部分信道的p个数和空数据被分配给在p个部分信道中未选择的部分信道。
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