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arXiv 0810.4366cs.ITmath.IT
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协作通信中的资源分配和中继选择

Resource Allocation and Relay Selection for Collaborative Communications

Saeed Akhavan Astaneh, Saeed Gazor

摘要:

研究了解码转发协作网络中的中继选择问题。用户能够协作;解码彼此的消息,重新编码并与自己的消息一起转发。我们研究了从合作中获得的性能:1)增加可实现的速率,2)节省传输能量和3)减少资源需求(资源意味着时间带宽)。为了保证公平性,我们固定所有用户之间的传输能量速率比。我们为协作协议(CP)分配最优的资源,并与用户直接发送消息的非协作协议(NCP)的结果进行比较。协作增益是信道增益和可用能量的函数,并且允许我们1)决定是否协作,2)在可能的中继用户中选择一个中继,以及3)确定可能的协作所涉及的增益和损失。如果直接源-目的地信道增益明显小于替代的相关链路的增益,则可以获得相当大的增益。我们证明,可以获得高达$(1+\sqrt[η]{\frac{k}{k+1}})^η$的速率和能量改善,其中$η$是环境路径损耗指数和$k$是所涉及的用户的速率的比率。对于低发射能量与接收噪声比(TERN),增益最大,并且在高TERN环境中,NCP是优选的。

英文摘要:

We investigate the relay selection problem for a decode and forward collaborative network. Users are able to collaborate; decode messages of each other, re-encode and forward along with their own messages. We study the performance obtained from collaboration in terms of 1) increasing the achievable rate, 2) saving the transmit energy and 3) reducing the resource requirement (resource means time-bandwidth). To ensure fairness, we fix the transmit-energy-to-rate ratio among all users. We allocate resource optimally for the collaborative protocol (CP), and compare the result with the non-collaborative protocol (NCP) where users transmits their messages directly. The collaboration gain is a function of the channel gain and available energies and allows us 1) to decide to collaborate or not, 2) to select one relay among the possible relay users, and 3) to determine the involved gain and loss of possible collaboration. A considerable gain can be obtained if the direct source-destination channel gain is significantly smaller than those of alternative involved links. We demonstrate that a rate and energy improvement of up to $(1+\sqrt[η]{\frac{k}{k+1}})^η$ can be obtained, where $η$ is the environment path loss exponent and $k$ is the ratio of the rates of involved users. The gain is maximum for low transmit-energy-to-received-noise-ratio (TERN) and in a high TERN environment the NCP is preferred.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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