Abstract:
A method for establishing a network topology for relay-transmission between sub-networks of a backbone network is provided to guarantee reliability of communication by transferring information via a path with the best communication performance when sub-networks communicate with each other. A super master device transmits a beacon messages to sub-master devices(S505). The sub-master devices transmit a response message to the super master device, respectively(S510). If any one of the sub-master devices does not have a MASTER_DEV_ID(S515), the super master device assigns the MASTER_DEV_ID to the sub-master device(S520). The super master device determines performance of communication of each sub-master device based on the received response message, and if communication performance of any one of the sub-master devices is lower than a pre-set reference(S525), the super master device removes MASTER_DEV_ID with respect to the corresponding sub-master device(S530). A primary node master device, which has been assigned the MASTER_DEV_ID from the super master device, transmits a beacon message to the super master device and the other sub-mater device in a backbone network(S535). When response messages are received from the super master device and the other sub-master device in the backbone network(S540), the primary node master device determines whether they have the MASTER_DEV_ID(S545) and assigns the MASTER_DEV_ID to the other sub-master device that does not have it(S550). The primary node master device determines whether the communication performance of the sub-master device(S555). If the communication performance of the sub-master device is not satisfied, the primary node master device removes the MASTER_DEV_ID of the sub-master device(S560). When the MASTER_DEV_ID is assigned to every sub-master device in the backbone network, it is determined that a network topology is completely established(S565).
Abstract:
PURPOSE: A transceiving method in a multiple antenna system for reducing necessary computational complexity in selection or the quantization of a coding word is provided to remove interference between multi users by quantizing error. CONSTITUTION: A transmitter receives a codebook index from a plurality of terminals(300). The transmitter selects the k terminal of a plurality of terminals(302). The transmitter generates the precoder matrices P put through to the codebook index of the selected terminal(304). The transmitter performs precoding(306). The transmitter transmits the transmission signal of which the precoding is performed for the first time slot(308).
Abstract:
본 발명은, 적어도 하나의 디바이스로 이루어진 복수의 서브네트워크를 갖는 백본네트워크의 서브네트워크 간 릴레이 전송이 가능한 네트워크 토폴로지 구축방법에 관한 것으로서, 각 서브네트워크내의 통신을 제어하는 각 서브 마스터 디바이스가 자기 자신을 제외한 타 서브 마스터 디바이스로 ID 요구 메시지를 전송하는 단계, 타 서브 마스터 디바이스로부터 ID 요구 메시지를 전송한 마스터 디바이스로 응답 메시지를 전송하는 단계, 각 서브 마스터 디바이스가 응답 메시지를 전송한 서브 마스터 디바이스 중, ID를 갖지 아니하는 서브 마스터 디바이스에 대해 ID를 부여하는 단계, 백본네트워크내의 모든 서브 마스터 디바이스에 대해 ID가 부여되면, 응답 메시지를 전송여부와 ID 부여된 순서에 따라, 각 서브 마스터 디바이스간의 접속가능한 경로인 네트워크 토폴로지를 형성하는 단계;를 포함한다. 이에 의해, 백본네트워크에 포함되는 각 서브네트워크 간의 통신이 가능하도록 네트워크 토폴로지를 설정할 수 있을 뿐만 아니라, 통신의 신뢰성을 보장할 수 있다. 백본네트워크, 서브네트워크, 슈퍼 마스터 디바이스, 서브 마스터 디바이스, 네트워크 토폴로지, 상위 노드, 하위 노드, 통신 성능, SNR
Abstract:
본 발명에 따른 다중 사용자 다중 안테나 통신 시스템에서 백터 퍼터베이션에 기반한 저 복잡도 프리코딩 방법은 후보 심볼의 누적가지 메트릭의 기준값을 결정하는 단계; 결정된 후보 심볼의 누적가지 메트릭의 기준값을 초과하는 누적가지 메트릭 값을 갖는 후보를 제거함과 함께 후보 심볼의 누적가지 메트릭의 기준값을 초과하지 않는 후보 심볼의 누적가지 메트릭 값을 엔트리로 등록하는 단계; 및 엔트리로 등록된 후보 심볼의 누적가지 메트릭 값 중 가장 작은 후보 심볼의 누적가지 메트릭 값을 선택하는 단계를 포함하는 것으로 기존에 사용된 Sphere Encoding 기법과 비교 하여 낮은 복잡도를 가지면서 성능은 유사한 이점이 있다.
Abstract:
PURPOSE: A channel feedback device in a mobile communications system and a method thereof are provided to improve feedback efficiency through feedback of elements of Grassmannian space which represents a row space. CONSTITUTION: Using a signal received from a transmission end, a channel is estimated(203). Using an orthogonalization technique, a normal form about the estimated channel is produced(205). A row operation of a matrix, which is produced according to the normal form, is performed. A first matrix which includes row space information of the estimated channel is produced(207). After the first matrix is quantized, the quantized matrix is fed back to the transmission end(209).
Abstract:
PURPOSE: A low complexity precoding device based on vector perturbation in a multi user multi antenna communication system is provided to obtain low complexity and similar performance. CONSTITUTION: A reference value of a cumulative branch metric of a candidate symbol is determined(S1). A candidate having a cumulative branch metric value is removed. The cumulative branch metric value exceeds the reference value of a cumulative branch metric value of a determined candidate symbol. The cumulative branch metric value of the candidate symbol is registered as entry(S2). The cumulative branch metric value of the candidate symbol does not exceed the reference value of a cumulative branch metric value of the candidate symbol. A cumulative branch metric value of the smallest candidate symbol among cumulative branch metric values registered as entry is selected(S3).