Subcarrier perceiving method in wireless communication network

Abstract

The invention discloses a subcarrier perceiving method in a wireless communication network. The method comprises the steps of firstly defining the initializing of a multi-level wiener filtering process, then executing iteration processes for multiple times to obtain a covariance matrix of an expected signal, then calculating a Gerschgorin disk radius and a Gerschgorin disk estimator based on the covariance matrix to estimate the number of occupied subcarriers, and finally judging the positions of the occupied subcarriers according to the magnitude of each subcarrier power and determining idle subcarriers and occupied subcarriers. The method provided by the invention has the characteristics of utilizing the orthogonality of signal subspaces and noise subspaces to judge without the dependency on the traditional subjective judgment threshold, having robustness on noise uncertainty without the need of apriori information of noise power, and belonging to a blind perceiving method without the need of statistic characteristics of channel information and signals. The method can be used for effectively restraining the influence of the background noise in the wireless communication network to system performance and is low in calculating complexity and strong in feasibility.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a subcarrier sensing method and device applicable to a wireless communication network. Background technique [0002] Spectrum resources in wireless communication networks are very limited and non-renewable. How to maximize the use of these precious spectrum resources for communication has attracted widespread attention in the industry. Statistics show that the spectrum utilization under the current spectrum allocation mechanism is extremely unreasonable. Some carriers carry a large amount of user data, while more carriers are idle. In this context, cognitive radio technology emerges as the times require. Its basic idea is spectrum reuse / sharing, obtaining spectrum utilization information through carrier sensing, and actively accessing idle carriers for communication. [0003] The present invention adopts a distributed orthogonal frequency division mul...

AI Technical Summary

Problems solved by technology

[0004] Due to the randomness of the noise in the wireless communication network, the noise variance will not be predicted in advance, and it is impossible to obtain an accurate estimate of the noise power, that is, there is a phenomenon of noise uncertainty, so the performance of the energy detection method will be seriously deteriorated

At the same time, the channel environment and signal statistical characteristics in wireless communication are also unknown, and matched filter detection and cyclostationary feature detection are no longer applicable

Images