Method based on network coding for transmitting data in cognitive subnetwork
A data transmission method and network coding technology, applied in the field of radio communication, can solve problems such as unoptimistic utilization of spectrum resources and lack of spectrum resources, and achieve the effects of reducing conflicts, increasing throughput, and improving possibilities
Inactive Publication Date: 2012-06-13
HARBIN INST OF TECH
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Problems solved by technology
With the rapid development of wireless communication technology, the problem of poor spectrum resources is becoming more and more serious. However, the utilization rate of spectrum resources in most countries is not optimistic.
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[0039] Specific implementation mode 1. Combination figure 1 Describe this specific implementation mode, the data transmission method based on network coding in the cognitive sub-network,
[0040] The cognitive subnetwork consists of a cognitive base station and L cognitive user receiving nodes. In the case of channel time synchronization, in each time slot, the data packets of each cognitive user can reach any one at the same rate. Authorized user channel, L is a positive integer;
[0041] The data processing method in the cognitive sub-network is:
[0042] Step 1, the base station caches the data packets to be sent, and when the number of cached data packets reaches m, execute step 2, where m is an integer greater than or equal to 2;
[0043] Step 2, the base station uses a linear random network coding method to encode the m data packets described in step 1 to obtain encoded data packets;
[0044]Step 3, the base station broadcasts the encoded data packet obtained in step ...
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A method based on network coding for transmitting data in a cognitive subnetwork relates to the filed of wireless communication, and aims to reduce the interference of cognitive users and authorized users in the cognitive subnetwork. In the method, data is transmitted in a network coding manner; compared with a conventional retransmission scheme ARQ, the cognitive users adopt an XOR network code, the transmission time is reduced for the cognitive users, the throughput capacity of the cognitive users is enlarged, and the interference of the cognitive users and the authorized users is lowered, thereby improving the possibility that other cognitive users find the spectrum hole of an authorized user signal channel. When in network coding, firstly, ensuring that receiving nodes can utilize the conventional information or future information to successfully decode and encoding information packets are provided as much as possible, and then reducing the transmission time to a great extent. In order to compare the throughput capacity and the interference probability of the cognitive users and the authorized users with the ARQ, the method sets the quantity of the encoding information packets. The invention is applicable to wireless transmission.
Description
technical field [0001] The present invention relates to the field of radio communications. Background technique [0002] According to the "National Medium and Long-Term Science and Technology Development Plan (2006-2020)", "National "Eleventh Five-Year" Science and Technology Development Plan" and "863 Program "Eleventh Five-Year" Development Outline" and other national-level scientific and technological strategic planning documents Deployment, the field of cognitive radio is listed as a key frontier exploration topic. Radio communication spectrum is a precious resource, and the principle of static frequency band allocation based on spectrum authorization is currently used. With the rapid development of wireless communication technology, the problem of poor spectrum resources is becoming more and more serious. However, the utilization rate of spectrum resources in most countries is not optimistic. Cognitive radio technology is proposed based on this problem. [0003] Cogn...
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IPC IPC(8): H04L1/00
Inventor 马琳慕伟谭学治孙鹏飞王孝魏守明
Owner HARBIN INST OF TECH