Wireless relay method independent of non-causal information in cognitive network

Abstract

The invention provides a wireless relay method independent of non-causal information in a cognitive network, and the method employs a slave user as a relay node to provide help for the communication of a master user, and reduces the interruption probability of the master user. An interference alignment and neutralization method is adopted to achieve the purpose of relaying a master user by using an interference signal received from the master user during communication of the slave user; by reusing the interference signals of the slave users, the interference neutralization is realized betweenthe slave users in a cooperative precoding mode, so that the relay signals are non-interference when reaching the receiving end of the master user. The technical scheme provided by the invention has the beneficial effects that the interruption probability of the master user can be reduced under the condition that the information sent by the slave user to the master user is completely unknown, andthe interruption probability is not dependent on the non-causal master user information; and data sharing is realized without waiting for a main user to transmit a transmission signal from the user, so that the purpose of relaying the main user is achieved.

Description

technical field [0001] The invention relates to the field of relay communication, in particular to a wireless relay method in a cognitive network that does not rely on non-causal information. Background technique [0002] Cognitive radio (CR) implements intelligent spectrum sharing based on dynamic spectrum allocation, which can greatly improve spectrum utilization. A secondary user should be able to reliably perceive the surrounding spectrum environment, accurately detect the sideband information of the legal primary user, and adaptively adjust the transmission parameters to communicate, and ensure that no communication is caused to the primary user during the entire communication process. performance degradation. However, since the secondary user's perception of the primary user is based on the feedback and wireless link symmetry, the uncertainty of the wireless link makes the secondary user's perception of the primary user difficult to be perfect, so , in practical appl...

AI Technical Summary

Problems solved by technology

However, these methods are all based on the premise that the secondary user successfully perceives the information of the primary user. The process is also non-causal, so it is difficult to be applied in practical systems

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