Multi-relay and multi-antenna-based cognitive wireless sensor network performance optimization method

Abstract

The invention discloses a multi-relay and multi-antenna-based cognitive wireless sensor network performance optimization method. According to the method, a cognitive wireless sensor network system model with multiple antennas and multiple relays is adopted; multi-relay cooperative cognition, relay selection and beamforming technologies are adopted, and therefore, the throughput of a cognitive wireless sensor network system can be improved, and at the same time, the interruption probability of the system can be decreased. With the method adopted, the accuracy of sensing results of the cognitive wireless sensor network system and high spectrum utilization rate can be ensured, the throughput of the whole system can be reduced, and at the same time, the interruption probability of the overall system can be reduced.

Description

technical field [0001] The invention relates to the application field of cognitive wireless sensor network and MIMO intersecting technology, in particular to a multi-relay multi-antenna based cognitive wireless sensor network performance optimization method. Background technique [0002] Cognitive radio (CR) is a smart radio technology proposed at the end of the 20th century. Its appearance promotes the effective use of spectrum resources. Through spectrum sensing and environment adaptation, the cognitive user (SU) can use the idle licensed spectrum for information transmission without interfering with the licensed user (PU) information transmission, thereby improving the efficiency of spectrum utilization. Cognitive radio must continuously sense the surrounding spectrum environment, and it needs to accurately and reliably detect whether a PU appears in the idle spectrum. Once it detects that the PU re-uses the idle spectrum, the SU must find or wait for a new idle frequency...

AI Technical Summary

Problems solved by technology

[0006] In the existing multi-relay technology, no relay is used for spectrum sensing, resulting in a waste of relay resources and reducing the accuracy of spectrum sensing results; and when multiple relays are selected, no relay selection is performed. It caused serious interference between a large number of relays, which hindered the improvement of the overall system performance.

At present, in the multi-relay multi-antenna cognitive sensor network, the research on the use of beamforming to enhance system performance is relatively complicated, so beamforming is not considered in the design, which makes it possible to better improve the performance of the system such as signal-to-noise ratio certain limitations

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