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Throughput-maximized cognitive radio system

A cognitive radio and throughput technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problem of not giving secondary users a method to obtain the channel occupancy characteristics of primary users, and achieve the effect of wide application

Inactive Publication Date: 2010-08-11
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

However, this method can only achieve the optimum when the slot length of the secondary user is close to zero, and there is no method for the secondary user to obtain the channel occupancy characteristics of the primary user

Method used

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  • Throughput-maximized cognitive radio system

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Embodiment Construction

[0018] The present invention is described in more detail below by means of examples, but the following examples are only illustrative, and the protection scope of the present invention is not limited by these examples.

[0019] Such as figure 1 As shown, the system of the present invention includes a radio transceiver 1 , a detector 2 , a scheduler 3 , a transmission controller 4 and a data terminal 5 .

[0020] The radio transceiver 1 uses the same channel / frequency band as the primary user, denoted channel C, on which radio signals can be sent and received. The radio transceiver 1 adopts a data transmission mode of listening first and speaking later. In a detection sub-slot of a time slot, the radio transceiver 1 receives a radio signal on the channel C and inputs the received signal to the detector 2 . In a transmission sub-slot of a time slot, the radio transceiver 1 transmits the data packets in the transmission buffer of the data terminal 5 on the channel C under the c...

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Abstract

The invention belongs to the radio communication field, and relates to a throughput-maximized cognitive radio system which aims at enabling secondary users to maximize the radio frequency spectrum not made full use by major users and simultaneously effectively controlling the interference on the major users by the secondary users. The invention uses the collision probability as the measure gauge and control target of the interference on the major users by the secondary users. The system comprises a radio transceiver, a detector, a dispatcher, a transmission controller and a data terminal. By optimally dispatching the secondary-user transmission probability on each transmission sub-time slot in each frequency spectrum idle area, the system maximizes the secondary-user throughput on a single channel and simultaneously limits the collision probability of the major-user data packets within the range of a preset threshold. The system acquires the major-user channel occupying characteristic in a prediction mode, and simultaneously, the performance of the system can be optimized for any secondary-user time slot length.

Description

technical field [0001] The present invention belongs to the field of wireless communication, and relates to a cognitive radio system (CognitiveRadio System), in particular to a cognitive radio system based on opportunistic spectrum access (Opportunistic Spectrum Access, OSA). Background technique [0002] In recent years, Dynamic Spectrum Access (DSA) technology, as an emerging wireless communication technology with the potential to greatly improve the utilization of spectrum resources, has attracted extensive attention from scientific research institutions around the world. For the introduction and classification of existing DSA technologies, see Q.Zhao and B.M.Sadler, "A survey of dynamic spectrum access," IEEE Signal Processing Magazine, vol.24, no.3, pp.79-89, May 2007. Among them, an opportunistic spectrum access (Opportunistic Spectrum Access, OSA) technology using a hierarchical access structure is emphasized. In the OSA-based cognitive radio system, the primary user...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L12/00H04L7/00H04N101/00
Inventor 曹洋屈代明钟国辉江涛王德胜
Owner HUAZHONG UNIV OF SCI & TECH
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