Abstract:
PURPOSE: A method for deciding a candidate symbol group in a multi-antenna system is provided to adjust the size of a candidate symbol group according to a channel condition, thereby reducing complexity of a tree search algorithm. CONSTITUTION: Candidate symbol group information is saved(1901). The candidate symbol group information corresponds to a condition number value of a channel. A condition number of the current channel is calculated(1902). The calculated condition number value and the saved condition number value are compared. According to the comparison result, a candidate symbol group of the current channel is determined(1903).
Abstract:
본 발명은 보안 전송량 산출 방법 및 시스템에 관한 것으로, 보다 구체적으로는 보안 구역이 존재하는 무선 네트워크에서 상대적 거리 변수를 이용하여 보안 전송량을 산출하는 방법 및 시스템에 관한 것이다. 보안 전송량 산출 방법은 송신기와 수신기 간의 거리에 기초하여 도청 노드를 고려한 상대적 거리 변수를 결정하는 단계; 및 상기 상대적 거리 변수를 이용하여 무선 네트워크의 보안 전송량을 산출하는 단계를 포함할 수 있다.
Abstract:
PURPOSE: Secure transmission amount calculation method and system using a relative distance variable in a wireless network in which a secure section exists are provided to calculate more realistic secure transmission amount by considering a relative distance between receiver and tapping node based on a transmitter. CONSTITUTION: A secure transmission amount calculation system determines a relative distance variable based on a radius of secure region and a distance between transmitter and receiver (401). The secure transmission amount calculation system determines optimal electric power distribution variable in a closed form (402). The secure transmission amount calculation system calculates a secure transmission amount by finding the optimal electric power distribution variable (403). [Reference numerals] (401) Determine a relative distance variable; (402) Determine an optimal electric power distribution variable; (403) Determine optimal secure transmission amount; (AA) Radius of a secure region(d_zone); (BB) Distance between a transmitter and a receiver(d_R); (CC) Secure transmission amount is closed; (DD) Disperse channel electric power; (EE) Secure transmission amount
Abstract:
PURPOSE: A transmission power decision method in a multi antenna system based on cooperative transmission is provided to minimize transmission power of a transmission device although each reception device QoS and a power constraint of the transmission device are satisfied. CONSTITUTION: A transmission power decision apparatus sets up a power constraint of a jth transmission device and transmission quality information of a kth reception device (201). The power transmission decision apparatus determines transmission power which is allocated to the jth transmission device when the jth transmission device transmits data to the kth reception device based on the power constraint and the transmission quality information (202). The transmission power decision apparatus determines transmission power which is allocated to the jth transmission device using a beam forming vector when the jth transmission device transmits data to the kth reception device. [Reference numerals] (201) Set up a power constraint and transmission quality information; (202) Determine transmission power; (AA) Start; (BB) End