Abstract:
A method for transmitting data in a transmitter of a multiple input and multiple output (MIMO) system according to one embodiment of the present invention comprises the steps of: selecting an antenna to be used for transmission among a plurality of antennas based on transmission data; and transmitting the transmission data via the selected antenna. Additionally, in another embodiment, the transmitter for transmitting the data in the MIMO system comprises: an antenna part including one and more antennas for transmitting and receiving signals to and from a receiver; and a controller for selecting the antenna to be used for transmission among the one and more antennas based on the transmission antenna and controlling the antenna part to transmit the transmission data via the selected antenna. The method for transmitting and receiving the data according to the embodiment increases throughput in a MIMO communication system. Therefore a transceiver better in the aspect of complexity and performance as compared with traditional technology may be designed. So, the present invention increases the number of symbols to be transmitted at once by acquiring additional degree of freedom (DOF) rather than traditional communication technology. Moreover, the presented technology may be used under specific conditions and, also, may enhance additional performance even when being applied to a traditional MIMO communication system.
Abstract:
리더 및 이를 포함하는 무선 주파수 인식 시스템, 및 리더와 태그간 신호 전송 방법이 개시된다. 본 발명의 실시예에 따른 무선 주파수 인식 시스템은, 태그와 리더에 미모 알고리즘을 적용시켜 수신 신호의 신호대잡음비를 최대화하고 가장 성능이 좋은 전송 경로를 선택하여 신호를 전송함으로써 신호의 전송 성능을 향상시킬 수 있다. 따라서, 무선 주파수 인식 시스템의 통신 거리가 확장될 수 있고, 대용량의 데이터 전송이 가능해진다.
Abstract:
PURPOSE: A tag, a RFID system including the tag and an image data coding method are provided to improve data transmission performance of the tag by encoding image data through source coding or channel coding. CONSTITUTION: A source encoder(11) executes source encoding about image data transmitted from an external input device. A modulator(13) modulates the source encoded data. A channel encoder(12) executes channel encoding about the source encoded data using a convolutional code. The source encoder generates the source encoded data from the image data using run length coding.
Abstract:
PURPOSE: A reader, an presuming system about the number of tags and a method including the reader are provided to maximize transmitting efficiency between the reader and tag by presuming the number of tags accurately. CONSTITUTION: An impact determination unit(21) determines a tag collision of slots. The impact determination unit transmits data about the slot which acquires a tag ID successfully among the slots to a tag estimator(23). A frequency domain analysis unit(22) analyzes frequency domain of a plurality of answer signals received in the slot which the collision is generated. The tag estimating unit presumes the number of tags received in the slot which the collision is generated based on the analyzing result. A plurality of response signals has a wave and tag ID having different frequencies.
Abstract:
PURPOSE: A reader improving signal transmission performance, a signal transmission method between an RFID(Radio Frequency IDentification) system including the same and a reader and a tag are provided to maximize the signal-noise ratio of the received signal. CONSTITUTION: A reader(10) comprises a plurality of antennas. The reader comprises the signal processing unit and a controller. The signal processing unit processes each response signal received in a plurality of antenna. The controller controls a plurality of antennae based on data processed in the signal processing unit. A tag(20) communicates with the reader. The tag comprises a plurality of antennae.
Abstract:
이미지 데이터를 전송할 수 있는 태그가 개시된다. 본 발명의 실시예에 따른 태그는, 소스 코딩 또는 채널 코딩을 적용하여 이미지 데이터를 인코딩함으로써 리더에서의 DC-오프셋을 최소화할 수 있고 데이터 압축의 효과를 최대로 할 수 있으며 데이터 전송 시 오류 발생 확률을 낮출 수 있다.
Abstract:
태그 수를 추정할 수 있는 리더가 개시된다. 본 발명의 실시예에 따른 리더는, 각 슬롯의 충돌이 발생하였을 경우에 충돌이 발생한 슬롯에 수신된 다수의 응답 신호들을 주파수 영역의 신호들로 변환하고, 변환된 신호들에서 첨점의 개수를 산출하여 산출된 첨점의 개수에 기초해서 충돌이 발생한 다수의 태그들의 개수를 추정할 수 있다. 따라서, 종래의 방식에 비해 태그의 개수가 매우 정확하게 예측될 수 있으며, 프레임 사이즈가 효율적으로 결정될 수 있다.