Distributed packet access method based on no-rate codes in cognitive radio

A cognitive radio and rateless code technology, applied in the field of distributed packet access, can solve problems such as reduced decoding efficiency at the receiving end and damage degree distribution

Inactive Publication Date: 2010-06-16
ZHEJIANG UNIV
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Problems solved by technology

Packet loss during transmission will destroy the degree distribution, resulting in reduced decoding efficiency at the receiv...

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  • Distributed packet access method based on no-rate codes in cognitive radio
  • Distributed packet access method based on no-rate codes in cognitive radio
  • Distributed packet access method based on no-rate codes in cognitive radio

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Embodiment Construction

[0058] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0059] refer to figure 1 , a distributed packet access method based on rateless codes in cognitive radio provided by the present invention is applied to the sender in the slave user pair. When the sender has data to be transmitted to the receiver, the data to be sent passes through the wireless After rate coding, it is classified and stored in the buffer queue according to the degree of coding packets, then randomly selects subcarriers for access, then selects the length of transmission packets, and then performs coding packet scheduling, and constructs transmission packets with coding packets plus control information It is loaded on the selected sub-carrier, finally modulated by multi-carrier, and sent to the channel to complete packet access.

[0060] Using the packet access method provided by the present invention, there is a figure 2 The...

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Abstract

The invention discloses a distributed packet access method based on no-rate codes in cognitive radio. The invention transmits data among secondary users by using no-rate packet encoding, and provides a package access method suitable for distributed multicarrier cognitive radio systems. The method comprises the following steps of: 1. classifying and caching data to be transmitted; 2. selecting the subcarrier in a random mode, wherein the access probability is the experience weighted value of the utility function value; 3. selecting the transmission packet length by predicting the arrival time of the master user; 4. carrying out the encoding packet scheduling by using a rate domain water-filling method; and 5. and constituting the complete transmission packet to complete the packet access. The method can effectively prevent inevitable packet losses in a cognitive radio system by using the no-rate packet encoding, can be effectively applied in distributed multicarrier cognitive radio systems because the secondary users can make decisions independently, and fully considers the relations of competitions and constraints among users, thereby effectively defusing collisions and enhancing the transmission efficiency.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a distributed packet access method based on rateless codes in cognitive radio. Background technique [0002] The cognitive radio system allows the secondary users to flexibly search for spectrum opportunities to communicate without affecting the communication of the primary user. This method can effectively solve the spectrum scarcity problem faced by the current wireless communication field, and has been widely used in academic and engineering applications. focus on. [0003] The unavoidable packet loss during transmission is a prominent problem in cognitive radio systems. On the one hand, the return channel of the primary user causes the transmission interruption of the secondary user. Group collisions are also inevitable. The use of rateless codes can effectively combat packet loss in transmission: rateless codes can generate any number of coded packets from the origina...

Claims

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Application Information

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IPC IPC(8): H04W28/14H04W74/08
Inventor 张朝阳陈淑保吴可镝王培雅陈少磊唐颖
Owner ZHEJIANG UNIV
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