INTERFERENCE ALIGNMENT WITH COOPERATIVE PRIMARY USER IN COGNITIVE NETWORKS

摘要

PURPOSE: An interference arrangement method of a recognition network in which a cooperative primary user exists is provided to allocate many data streams to a secondary user in a step of determining a transmission matrix for interference arrangement by considering channel situations of the secondary user on reception side of the primary user and supplying a reception filter matrix arranging and removing the interference transmitted by the secondary user. CONSTITUTION: A transmission matrix V1 is determined through unique value decomposition by a transmitter of a primary user. A receiver of a secondary user determines a matrix Bk generating the interference transmitted from the primary user in null-space. A matrix U1 arranging the interference transmitted by the secondary user is determined by the receiver of the primary user. The receiver of the secondary user determines a matrix Uk arranging the interference transmitted from other users and uses the matrix Uk multiplying the matrix Bk to the matrix Uk for a reception matrix. The transmitter of the secondary user determines a matrix Vk in order not to interfere the receiver of the other users by using the reception matrix.