Asynchronous channel perception method with unknown timing

A channel-aware, asynchronous technology, applied in the field of communication, can solve problems such as the perceived time difference between the transmitter and the receiver of the cognitive user, and the inability of the authorized user and the cognitive user to cooperate and timing.

Active Publication Date: 2016-06-01
BEIJING UNIV OF POSTS & TELECOMM
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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

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  • Asynchronous channel perception method with unknown timing
  • Asynchronous channel perception method with unknown timing
  • Asynchronous channel perception method with unknown timing

Examples

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[0164] Example 1:

[0165] Simulate the asynchronous channel sensing method of the present invention, and set the birth probability of authorized users p b =0.2, the survival probability is p s =0.8, the number of sampling points M=100, and the total time is set to 4000. M t Indicates the range of the perceived time difference, that is, the perceived time difference t k ∈[0,M t ], respectively take M t 20, 60, 100; the simulation results of spectrum sensing performance are as follows Figure 5 As shown, Figure 5 It is a simulation diagram of the total correct detection probability under three sensing time difference ranges. The abscissa is the actual signal-to-noise ratio snr, and the ordinate is the overall correct detection probability P D . It can be seen from the simulation results that when the number of fixed sampling points M = 100, the unknown perception time difference M t The larger the dynamic range, the worse the spectrum sensing performance; at the same time, the hig...

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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 field of communication, and specifically is an asynchronous channel sensing method with unknown timing. Background technique [0002] With the rapid development of wireless communications, 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 operation of authorized users (PrimaryUser, PU). [0003] Because cognitive radio users (SecondaryUser, SU) cannot cause interference to authorized users, spectrum sensing becomes a primary prerequisite in CR technology; spectrum sensing means that SU obtains occupancy information of a specific frequency band through signal detection and processing. [0004] Classical spectrum sensing techno...

Claims

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Application Information

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IPC IPC(8): H04B17/382
CPCH04B17/382
Inventor 李斌余盼赵成林许方敏章扬
Owner BEIJING UNIV OF POSTS & TELECOMM
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