Orthogonal matrix-based cognitive radio spectrum sharing method

Abstract

The invention discloses an orthogonal matrix-based cognitive radio spectrum sharing method, which comprises the following steps: firstly, according to channel information fed back by a receiving end to a transmitting end, acquiring a preprocessing orthogonal matrix of the transmitting end by utilizing orthogonality with an interference channel; preprocessing signals before processing by multiplying the preprocessing orthogonal matrix by a signal matrix of the transmitting end; and utilizing the orthogonality between the interference channel and the preprocessing orthogonal matrix to eliminate mutual interference between an authorized master user and a non-authorized cognitive user so as to realize zero mutual interference between different users in a cognitive system and effectively transmit and receive data. The authorized master user and the non-authorized cognitive user equally share spectrum resources so as to improve the utilization ratio of the wireless spectrum resources and relieve the contradiction of the urgent lack of the wireless communication spectrum resources at present and in the future.

Description

technical field [0001] The invention relates to a cognitive radio technology in a wireless communication system, in particular to a cognitive radio frequency spectrum sharing method based on an orthogonal matrix, and belongs to the technical field of information and communication engineering. Background technique [0002] With the continuous growth of demands for various wireless communication services, the demand for frequency spectrum resources in wireless communication systems continues to increase, so that wireless frequency spectrum resources become increasingly scarce. However, spectrum measurement studies show that the utilization rate of licensed spectrum is very low, resulting in serious waste of licensed spectrum holes. The reason is that the static spectrum allocation system does not match the dynamic spectrum utilization mode, resulting in tight wireless spectrum planning and low utilization efficiency. In order to develop a wireless communication system with sp...

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Problems solved by technology

However, the assumptions of these optimal strategies include many unrealistic factors, such as: assuming that the unlicensed cognitive users can predict all or part of the information of the authorized primary users; the transmitter accurately obtains all channel state information in advance, etc.

Regardless of the cognitive ability of the unauthorized cognitive user, the implementation of these assumptions will be very complicated, because the unauthorized cognitive user needs to decode the transmission information of the authorized primary user or assume that the wireless channel is a quasi-static channel and requires Unauthorized cognitive users keep track of all channel states

In addition, existing preprocessing-based methods can only eliminate the human interference of unauthorized cognitive users on authorized primary users, and non-authorized cognitive users can receive severe interference from authorized primary users, resulting in poor performance of unauthorized cognitive users

Therefore, the existing spectrum sharing scheme is difficult to be practical

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