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1.发明授权
公开(公告)号：KR101470526B1
公开(公告)日：2014-12-08
申请号：KR1020120142994
申请日：2012-12-10
Applicant: 포항공과대학교 산학협력단
IPC: H04J11/00
Abstract: 본발명은 OFDM 기반인지라디오에서부사용자의기회적전송중 신속한주 사용자탐지방법및 시스템에관한것으로서, 그 OFDM 기반인지라디오에서부사용자의기회적전송중 신속한주 사용자탐지방법은제1안테나와제2안테나를구비하는부사용자송수신단말이복수의반송파중 미리정의된하나의반송파에주기적으로소정길이의시간만큼널(null) 심볼을삽입하여 OFDM 기반의인지라디오신호를제1안테나를통해전송하는단계부사용자송수신단말이널(null) 심볼구간에서제2안테나를통해주사용자송수신단말로부터전송되는, 반송파신호인 PU신호를수신하여검출하는단계및 PU신호가검출되면부사용자송수신단말이제1안테나를통해송신되는 OFDM기반의인지라디오신호의전송을중단하는단계를포함한다.본발명에의하면, 종래의주 사용자탐지기법에비해더 적은오버헤드와더 적은추가장치로주사용자의채널신호를신속하게탐지(detection)할수 있다.
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公开(公告)号：KR1020130034723A
公开(公告)日：2013-04-08
申请号：KR1020110098747
申请日：2011-09-29
Applicant: 포항공과대학교 산학협력단
CPC classification number: H04J11/00 , H04L1/004 , H04L27/0006 , H04W4/70
Abstract: PURPOSE: A recognition radio system and a data transmission method of the recognition radio system are provided to transmit and receive the data to a main user terminal without damage even when assistant user terminals using an OFDM(Orthogonal Frequency Division Multiplexing) sense different available frequency bands. CONSTITUTION: The recognition radio system(10) comprises a first assistant user terminal(100) and a second assistant user terminal(200). The first assistant user terminal transmits data to the second assistant user terminal by using a frequency band of a main user terminal. The second assistant user terminal receives the data from the first assistant user terminal by using the frequency band of the main user terminal. The first assistant user terminal comprises a radio communication unit, an encoding unit, and a controller. The radio communication unit senses a spectrum of the frequency band of the main user terminal. The encoding unit converts the data which are going to be transmitted into code words including a plurality of symbols by using a forward error correction method. A controller divides the spectrum sensed by controlling the radio communication unit into a plurality of subcarrier and transmits each symbol to the second assistant user terminal through the divided subcarrier. [Reference numerals] (100) First assistant user terminal; (200) Second assistant user terminal; (AA) Data transmission; (BB) CR system;
Abstract translation: 目的：提供识别无线电系统的识别无线电系统和数据传输方法，以便即使在使用OFDM（正交频分复用）的辅助用户终端感测不同的可用频带的情况下也可以向主用户终端发送和接收数据 。 构成：识别无线电系统（10）包括第一辅助用户终端（100）和第二辅助用户终端（200）。 第一辅助用户终端通过使用主用户终端的频带向第二辅助用户终端发送数据。 第二辅助用户终端通过使用主用户终端的频带从第一辅助用户终端接收数据。 第一辅助用户终端包括无线电通信单元，编码单元和控制器。 无线电通信单元感测主用户终端的频带的频谱。 编码单元通过使用前向纠错方法将要发送的数据转换为包括多个符号的码字。 控制器将通过控制无线电通信单元所感测的频谱划分为多个子载波，并通过分割的子载波将每个符号发送到第二辅助用户终端。 （附图标记）（100）第一辅助用户终端; （200）第二辅助用户终端; （AA）数据传输; （BB）CR系统;
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公开(公告)号：KR1020080013750A
公开(公告)日：2008-02-13
申请号：KR1020070078168
申请日：2007-08-03
Applicant: 학교법인 포항공과대학교 , 포항공과대학교 산학협력단
Abstract: A Method for providing QoS to control packets in a congestion state in a wireless sensor network is provided to minimize throughput in the congestion state through a drop-tail queue where a quota is set up in the packet receiving terminal of a wireless sensor network terminal. A method for providing QoS(Quality of Service) to control packets in a congestion state in a wireless sensor network comprises the following steps of: registering an enqueue process for a corresponding packet in a process scheduler(204) by generating interrupt when the packet is received from a sensor; allowing the process scheduler to perform the enqueue process for the packet received through an enqueue process unit(206) according to the registered enqueue process; allowing an quota manager(300) to allocate a storage space for a control packet to an queue receiving unit(210) and storing successively the control packet and data packet received through the enqueue process unit, and registering a dequeue process unit(208) in the process scheduler; and allowing the process scheduler to control the dequeueue process unit and process packets in the queue receiving unit.
Abstract translation: 提供了一种用于提供QoS以控制无线传感器网络中的拥塞状态的分组的方法，以通过在无线传感器网络终端的分组接收终端中建立配额的下降队列来最小化拥塞状态中的吞吐量。 一种用于提供QoS（服务质量）以控制无线传感器网络中的拥塞状态的分组的方法包括以下步骤：通过在分组是的时候产生中断来在进程调度器（204）中注册对应的分组的入队过程 从传感器接收; 允许进程调度器根据注册的入队过程对通过入队处理单元（206）接收的分组执行入队进程; 允许配额管理器（300）向队列接收单元（210）分配用于控制分组的存储空间，并且连续地存储通过所述入队处理单元接收到的控制分组和数据分组，以及将出队处理单元（208）登记在 进程调度程序; 并且允许进程调度器控制队列接收单元中的队列处理单元和处理分组。
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公开(公告)号：KR1020140074721A
公开(公告)日：2014-06-18
申请号：KR1020120142994
申请日：2012-12-10
Applicant: 포항공과대학교 산학협력단
IPC: H04J11/00
CPC classification number: H04L27/2647 , H04J11/00 , H04L27/0006
Abstract: The present invention relates to a method and a system for promptly detecting a primary user during random transmission of a secondary user in an OFDM-based cognitive radio. The method of the present invention includes the steps of: transmitting, by a secondary user transmission terminal having a first antenna and a second antenna, an OFDM-based cognitive radio signal through the first antenna by regularly inserting a null symbol in a certain length into a predefined single carrier in multiple carriers; receiving and detecting, by the secondary user transmission terminal, a PU signal which is a carrier signal received from a primary user terminal through the second antenna in a null symbol section; and suspending, by the secondary user transmission terminal, the transmission of the OFDM-based cognitive radio signal transmitted through the first antenna if the PU signal is detected. According to the present invention, the method and the system can promptly detect a channel signal of a primary user by fewer overheads and fewer additional devices than the existing primary user detection method.
Abstract translation: 本发明涉及一种用于在基于OFDM的认知无线电中的次要用户的随机传输期间及时检测主用户的方法和系统。 本发明的方法包括以下步骤：通过具有第一天线和第二天线的二次用户传输终端，通过定期地将一定长度的空符号插入到基于OFDM的认知无线电信号中，通过第一天线 多载波中的预定义单载波; 由第二用户发送终端接收和检测作为通过第二天线从空用符号部分从主用户终端接收的载波信号的PU信号; 并且如果检测到所述PU信号，则由所述次级用户传输终端暂停通过所述第一天线发射的基于OFDM的认知无线电信号的传输。 根据本发明，该方法和系统可以通过比现有主用户检测方法更少的开销和更少的附加设备来迅速地检测主用户的信道信号。
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