Joint transmission method for carrying out parallel transmission and cooperation in cognitive network

A technology of joint transmission and cognitive network, applied in the field of cognitive radio network, can solve the problems of no compensation, loss of throughput of the main user, etc.

Inactive Publication Date: 2013-07-24
XIDIAN UNIV
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  • Application Information

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Problems solved by technology

Moreover, in this method, the secondary user causes a certain lo

Method used

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  • Joint transmission method for carrying out parallel transmission and cooperation in cognitive network
  • Joint transmission method for carrying out parallel transmission and cooperation in cognitive network
  • Joint transmission method for carrying out parallel transmission and cooperation in cognitive network

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Embodiment Construction

[0052] refer to figure 1 , the simulation scene of the present invention includes a primary user and two secondary users, that is, m=2, the primary user includes a primary user transmitter PT and a primary user receiver PR, and each secondary user includes a secondary user user transmitter ST and a secondary user receiver SR, where the i-th secondary user’s transmitter and receiver are denoted as ST i and SR i , the link length of the primary user is d p , the link length of each secondary user is d s ; The primary user uses the stop-and-equal-ARQ protocol for transmission, and there is no limit to the number of retransmissions, and the secondary user implements the concurrent transmission and cooperative joint transmission method by listening to the feedback information from the primary user receiver.

[0053] refer to figure 2 , the method for concurrent transmission and cooperative joint transmission of the present invention includes the following steps:

[0054] Step...

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Abstract

The invention discloses a joint transmission method for carrying out parallel transmission and cooperation, wherein the joint transmission method is applied to a cognitive network and aims at resolving the problems that an existing transmission strategy designed based on an automatic repeat request (ARQ) protocol is little in handling capacity obtained by a secondary user when a primary user has good channel conditions, and handling capacity loss of the primary user has no compensation. The joint transmission method mainly comprises the steps that 1. the secondary user sets transmitted power, and the fact that the outage probability of the primary user meets an interrupt threshold value is guaranteed; 2. the secondary user monitors feedback information of the primary user, and judges whether a current slot time is a first transmission time slot or a retransmission time slot; 3. if the current time slot is the first transmission time slot, the secondary user and the primary user are in parallel transmission, and handling capacity is obtained; and 4. if the current time slot is the retransmission time slot, the secondary user serves as a relay of the primary user, and compensates interference caused on the primary user in the parallel transmission. According to the joint transmission method, the handing capacity of the secondary user is improved on the premise that the primary user obtains the minimum handling capacity loss, definite compensation is provided for the handling capacity loss of the primary user, and the joint transmission method can be used for improving transmission efficiency of the cognitive network.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to a joint transmission method of a cognitive network, and can be used in a cognitive radio network. Background technique [0002] Cognitive radio networks allow secondary users to use the spectrum resources of primary users for opportunistic transmission on the premise of ensuring the quality of service (QoS) of primary users. In the primary user system based on the automatic repeat request protocol ARQ, the secondary user obtains the current transmission status of the primary user by listening to the data transmission information of the primary user and feedback information such as ACK or NAK. Under the condition that the interference is less than a certain threshold value, opportunistic access is performed. Most of the existing literatures generally use the following transmission method when studying the access mechanism of the secondary user: when the primary user tran...

Claims

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Application Information

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IPC IPC(8): H04L1/16H04L1/18
Inventor 盛敏孙红光张琰史琰王玺钧李建东刘佳刘俊宇
Owner XIDIAN UNIV
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