基于无速率码的认知无线网络协同频谱接入

Yan Chen, Hui Huang, V. Lau
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引用次数: 32

摘要

在认知网络中,由于次要用户不是频谱的授权所有者,他们只能在保证其传输不会破坏主通信的QoS性能的同时,机会性地和合作地访问频谱,以利用自己的最佳努力吞吐量。本文考虑主用户具有延迟敏感业务(如语音或视频业务)的认知网络,并将平均延迟约束作为主用户的QoS要求。在此约束下,基于主发射机和从发射机均采用无速率编码的假设,提出了三种辅助用户的协同频谱接入方案。对每种方案的辅助用户的平均吞吐量进行了计算和数值比较。通过数值模拟说明了系统参数和网络拓扑结构对这些方案的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cooperative Spectrum Access for Cognitive Radio Network Employing Rateless Code
In cognitive networks, since the secondary users are not licensed owners of the spectrum, they can only access the spectrum opportunistically and cooperatively to exploit the best effort throughput for themselves while guaranteeing that their transmissions would not break the QoS performance of the primary communications. In this paper, we consider the cognitive network in which the primary users have delay sensitive services, e.g., voice or video services, and we take the average delay constraint as primary users' QoS requirement. Three cooperative spectrum access schemes for secondary users under such constraint are proposed, based on the assumption that both the primary and secondary transmitter employ rateless coding. The average throughput of the secondary user for each scheme is calculated and compared both analytically and numerically. The impacts of system parameters and network topology on these schemes are also illustrated via numerical simulations.
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