Abstract
Abstract The purpose of this article is to analyze the impact of network coding in wireless networks. We consider a network coded ALOHA that performs bi-directional network coding over the ALOHA MAC protocol in a star topology network. The transmission probabilities of each outer node and the center node, and the target signal-to-interference-plus-noise ratio (SINR) are jointly optimized to achieve the maximum throughput of coded ALOHA. We analyze and compare the optimal performance of slotted and coded ALOHA. Under the unsaturated traffic condition at the center node, we derive practical throughput and delay, considering the network coding opportunity and the maximum queue length of the center node. Under the saturated traffic condition, we obtain a throughput upper bound of coded ALOHA to judge the ideal gain of network coding. The impact of asymmetric topology is evaluated with simulations.
Highlights
The demand for high-quality mobile services has stimulated the development of new wireless network technologies
To verify the effect of network coding, we investigate and analyze embedding the network coding into the ALOHA protocola in the star topology, where the center node communicates with source/destination nodes one hop away
In this article, we presented a coded ALOHA that performs the bi-directional network coding over ALOHA
Summary
The demand for high-quality mobile services has stimulated the development of new wireless network technologies. One reason is that the radio frequency is restricted and is a finite resource, and the same frequency channel cannot be used at the same time and in the same space. Due to this scarcity of radio resources, many researchers have tried to improve the performance of wireless links. Medium access control (MAC) has been studied in order to allocate radio resources by resolving the conflicts from multiple users’ access to the common medium and improve the channel access efficiency in wireless networks. Many variations to ALOHA have been proposed This protocol is used in RFID [2].
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