Abstract:
PURPOSE: A P2P network system and an operating method based on a region thereof are provided to reduce network load by searching resources from edge peer arranged in the close location. CONSTITUTION: A P2P network system comprises edge peers(P1, P2, P3, P4, P5, P6, P7) and super peers(R1, R2, R3, R4, R5, R6, R7). One of the edge peers stores resource. A super peer is connected to edge peers. The resource information about the edge peers is classified by the super peer. One of the super peers distributes resource information between the super peers. One of the super peers manages the resource information list. The super peer shares the resource information list with adjacent super peer. The super peer manages a region information list.
Abstract:
A method for seamlessly receiving a symbol from a transmitting end at a receiving end even when error occurs in a certain radio resource of a multiband OFDM system that transmits a same symbol at least two times. The multiband OFDM system includes a transmitting end selecting two radio resources from at least three radio resources and consecutively transmitting a symbol using the selected radio resources, and a receiving end receiving the symbol from the transmitting end.
Abstract:
본 발명은 직교주파수분할다중시스템의 수신단에 전송 도중 발생한 오류를 줄일 수 있는 인터리빙 방안을 제안한다. 이를 위해 본 발명은 전달받은 데이터 비트들을 인터리빙 메모리에 기록하며, 기록된 데이터 비트들을 심벌 인터리빙, 톤 인터리빙, 사이클릭 쉬프트를 동시에 수행하기 위해 일정한 순서에 따라 독출한다. 또한, 직교주파수분할다중 시스템의 로직을 간소화 하기 위해 인터리버로부터 전달받은 데이터 비트를 고속퓨리에변환(FFT) 매핑하고, FFT 매핑을 수행한 데이터 비트를 변조한다. 즉, FFT매핑을 수행한 후 변조 과정을 수행함으로서 로직을 간단히 할 수 있다. MBOA, 인터리버, OFDM, FFT
Abstract:
본 발명은 입력된 신호를 신속히 처리하기 위한 고속 퓨리에 변환 장치 및 방법을 제안한다. 이를 본 발명은 입력된 N 개의 신호들을 처리하는 고속 퓨리에 변환함에 있어서, 입력된 신호들을 4개의 그룹으로 구분하고, 구분한 각 그룹에 포함된 신호를 라딕스-2 싱글패스 지연 피드백(R2SDF)으로 구현된 N/4-포인트 고속 퓨리에 변환을 수행한다. 전달받은 상기 N/4 고속 퓨리에 변환을 수행한 신호들에 대해 라딕스-4 연산을 수행한다. 이와 같이 입력된 신호들을 N/4 포인트 고속 퓨리에 변환부들을 이용하여 병렬처리함으로서 입력된 신호를 신속히 처리할 수 있다. FFT, OFDM, 병렬 구조, 라딕스-4
Abstract:
A method for seamlessly receiving a symbol from a transmitting end at a receiving end even when error occurs in a certain radio resource of a multiband OFDM system that transmits a same symbol at least two times. The multiband OFDM system includes a transmitting end selecting two radio resources from at least three radio resources and consecutively transmitting a symbol using the selected radio resources, and a receiving end receiving the symbol from the transmitting end.
Abstract:
정합필터 및 그에 의한 상호상관 수행방법이 개시된다. 본 발명에 따른 정합필터는 입력된 샘플신호를 소정 개수로 디멀티플렉싱하는 디멀티플렉서와, 디멀티플렉싱된 샘플신호 각각에 대해 소정 시퀀스와 각각 상호상관을 수행하는 상호상관기를 포함한다. 이로써, 저속의 곱셈기만으로도 UWB 시스템과 같은 샘플링 레이트가 높은 시스템에서 상호상관을 고속으로 수행할 수 있다. 정합필터, 상호상관, 디멀티플렉싱
Abstract:
A short PN code generating device in a mobile communication network having a Nx CDMA communication system performing spreading at an Nx chip rate using a short PN code of chip length Nx2k and a 1x CDMA communication system performing spreading at a 1x chip rate using a short PN code of chip length 2k. The device generates a short PN code such that the Nx CDMA communication system can distinguish at least the same number of base stations as the 1x CDMA communication system can distinguish. The device includes a sequence generator for generating an m-sequence having a chip length longer than the chip length Nx2k to output an I-component short PN code; and a short PN code generator for switching the generated m-sequence at predetermined chip periods to alternately output the m-sequence as an I-component short PN code and a Q-component short PN code.
Abstract:
Disclosed is a power control method for a mobile station which has at least one compressed mode frame. A compressed mode frame includes a data transmission duration where data is transmitted at a first frequency, and a data transmission-off duration where a second frequency is searched to perform an inter-frequency handoff to the second frequency. The transmission power during the data transmission duration is increased to compensate for the loss of transmission power during the data transmission-off duration. In the method, a base station sets a power control threshold depending on the length of the data transmission-off duration. The base station receives transmission power-increased data and compares the received power of the data signal with the power control threshold. The base station generates a power-up command when the power control threshold is higher than the receiving power, and generates a power-down command when the power control threshold is lower than the receiving power.