An Asynchronous Channel Sensing Method with Unknown Timing

Abstract

The invention discloses an asynchronous channel perception method with unknown timing. The asynchronous channel sensing method specifically comprises the following steps: a first step, predicating an existence probability and a perception time difference of a certain PU at a k moment; a second step, updating the existence probability predicted value and the perception time difference via an observation value; a third step, comparing the updated existence probability predicted value with a decision threshold to obtain a state value of the PU; a fourth step, calculating the perception time difference of the PU at the k moment according to the state value; a fifth step, calculating a state value and a weight of a born particle at the k moment according to the perception time difference at a k-1 moment; and a sixth step, judging whether the k moment is the last moment, if so, recording and storing the perception time differences and state values of all moments; and otherwise, iteratively predicting the existence probability and the perception time difference of the PU at a k+1 moment through a particle set at the k moment. The asynchronous channel perception method has the advantages of being suitable for the dynamic spectrum sharing of a heterogeneous wireless network, avoiding the frequent signaling interaction between the PU and SU, reducing the configuration complexity of a CR system and saving the time and the energy cost.

Description

technical field [0001] The invention belongs to the communication field, in particular to an asynchronous channel sensing method with unknown timing. Background technique [0002] With the rapid development of wireless communication, spectrum as a non-renewable resource has become extremely scarce; in order to solve this problem, cognitive radio (Cognitive Radio, CR) technology has received extensive attention and in-depth research. Cognitive radio technology aims to reuse and share spectrum resources from multiple dimensions such as time, space and frequency without affecting the normal work of authorized users (Primary User, PU). [0003] Since cognitive radio users (Secondary Users, SUs) cannot interfere with licensed users, spectrum sensing has become a primary premise in CR technology. Spectrum sensing means that SUs obtain occupancy information of specific frequency bands through signal detection and processing. [0004] Classical spectrum sensing technologies include...

AI Technical Summary

Problems solved by technology

[0007] In the heterogeneous network, the authorized user and the cognitive user usually cannot cooperate in timing, which leads to the problem that there is a perception time difference between the authorized user transmitter and the cognitive user receiver, and proposes an asynchronous channel with unknown timing method of perception;

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