Abstract:
본 발명은 STBC(Space Time Block Code) 스킴을 지원하는 송신기, 수신기에 관한 것으로서, UW(Unique Word) 기반의 전송 시퀀스에 따른 신호를 송신하고 수신된 신호에 따른 수신 시퀀스의 직교성(Orthogonality)을 복원하기 위해 UW 사용함으로써, 다이버시티 이득과 등화 이득을 동시에 얻을 수 있고 에러 전파(Error Propagation)없이 향상된 성능을 달성할 수 있도록 하는 UW 기반 SC 시스템에서 STBC 스킴을 지원하는 송신기, 수신기 및 그 방법을 개시한다. 본 발명에 따른 UW 기반 SC 시스템에서 STBC 스킴을 지원하는 송신기는 소정의 패턴에 의해 입력된 복수의 심볼들을 시공간 코드화를 사용하여 부호화하는 ST(Space Time) 인코더, 상기 부호화된 복수의 심볼들 중 제1 심볼의 전송 시퀀스에 제1 UW 를 삽입하여 제1 전송 시퀀스를 생성하는 제 1 UW 가산기, 및 상기 부호화된 복수의 심볼들 중 제2 심볼의 전송 시퀀스에 제2 UW를 삽입하여 제2 전송 시퀀스를 생성하는 제 2 UW 가산기를 포함하는 것을 특징으로 한다. UW(Unique Word), SC(Single Carrier), STBC(Space Time Block Code), FD-DFE(Frequency Domain-Decision Feedback Equalization)
Abstract:
PURPOSE: A multiple input multiple output communication system for supporting primary user and secondary user is provided to offer various services by assigning one primary user and a secondary user to one beam based on the characteristics of services. CONSTITUTION: According to the property of services required by users, the scheduler(210) groups a primary user and a secondary user. A superposition coding unit(220) generates the transmitting data stream by superposition coding the primary data for the primary user and the supplementary data for the secondary user. A beam former(230) performs a beam forming the transmit data stream. The scheduler groups a primary user and secondary use based on the data size of services required by users, the required transmission rate, or delay tolerance value.
Abstract:
A relay signal controlling system and a method thereof are provided to maximize diversity effect generated between a source node and a transit node by controlling a first time slot decoding source signals broadcasted from a source node and a second time slot in which source node transmits relay signals to a destination node. A channel state recognizing part(310) recognizes the condition of radio channels formed between adjacent nodes based on channel state information which adjacent nodes feed back. A time/power assigning part(320) assigns considers a first time slot in which a transit node decodes the source signal broadcasted from a source node and considers the power of the source signal or a second time slot in which the transit node transmits relay signals corresponding to the source signal to the destination node and assigns one among the power of the relay signal.
Abstract:
A method and an apparatus for controlling transmit power in a DF(Decode-Forward) relaying system are provided to increase the efficiency of Tx power and minimize outage probability by quantizing a communicable area in a finite feedback state and allocating differentiated power to each quantization region. An apparatus for controlling transmit power in a DF relaying system comprises an acquisition part, a judgement part, and a determination part. Using a pilot signal, the acquisition part acquires the channel information of the first link between a source node and a destination node, the channel information of the second link between the source node and a relay node, and the channel information of the third link between the relay node and the destination node. Based on the acquired channel information, the judgement part judges a specific quantization region to which each channel information belongs. The determination part determines the information of Tx signal power corresponding to each quantization region.
Abstract:
A relay power control device of an amplify-forward relay system and a method thereof are provided to control transmission signal power of relay by using maximum generalized eigen values for each relay in the destination, thereby improving reception diversity. A signal receiver(210) receives signals transmitted to plural reception antennas through more than one relay or directly from a source. A channel information obtainer(220) obtains channel information between the source and the relays and channel information between the relays and the reception antennas. A power control signal generator(230) generates a power control signal based on the obtained channel information and a maximum SNR(Signal to Noise Ratio). A relay power controller(240) controls transmission signal power for the relays by sending the generated power control signal to the relays.
Abstract:
A resource management system of a wireless communication system and a system thereof are provided to dynamically rent and collect surplus resources between base stations of the wireless communication system, thereby magnifying usage efficiency of deficient radio resources. A hiring base station transmits an RC-REQ(Resource Collecting Request) message to a renting base station(S701), starts timer operation(S702), and waits for reception of an RC-RSP(Response) message from the renting base station(S703). The hiring base station transmits an RC-RSPACK(Response Acknowledgement) message by using uplink of the renting base station(S706), and operates the timer(S707), then waits for reception of an RC-ACK message from downlink of the renting base station(S708). When the RC-ACK message is received, the hiring base station collects resources from the renting base station(S709).
Abstract:
본 발명은 무선 인지 기술을 이용한 통신 시스템에서 무선 자원 분할 요청 방법에 관한 것으로, 한 기지국이 실제로 사용되지 않고 비어있는 주파수 대역을 감지하여 그 대역을 사용하는 동안 동일 대역을 사용하고자 하는 새로운 기지국이 나타났을 경우, 효율적인 자원 분배를 위한 기지국 간의 메시지 교환 방식에 관한 것이다. 본 발명의 무선 자원 분할 요청 방식은 새로운 기지국이 이미 특정 주파수 대역을 사용하고 있는 기지국으로부터 방송되는 무선 자원 현황 정보를 수신하고, 이를 바탕으로 기지국 간 통신을 위해 추가로 정의된 상향링크 부 채널을 이용하여 자원 할당을 요구하며, 두 기지국 간에 정의된 채널을 이용한 자원 협상 메시지 교환이 이루어져 효율적으로 기지국 간의 자원을 분배할 수 있게 한다. 무선 인지 기술(Cognitive Radio), 무선 자원, 기지국