On the hybrid relaying protocol for time division broadcasting
On the hybrid relaying protocol for time division broadcasting
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DOI：
10.1002/ett.2761
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发表时间：
2015-05
影响因子：
3.6
通讯作者：
Youyun Xu;Xiaochen Xia;Kui Xu;Dongmei Zhang
中科院分区：
文献类型：
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作者：
Youyun Xu;Xiaochen Xia;Kui Xu;Dongmei Zhang
本文针对时分广播协议，研究了一种新的混合中继协议。该协议不是简单地对接收到的终端信息进行放大转发或译码转发，而是采用合理选择网络编码(即按位异或)和叠加编码结合终端信息的混合中继协议来转发终端信息。给出了该协议的近似中断概率的封闭形式，并通过蒙特卡罗仿真验证了该表达式的紧密性。同时，对协议的可实现分集进行了分析。分析和仿真结果表明，通过合理选择中继端的合并方式，该协议总能实现两个节点的完全分集。通过与现有几种协议在两种不同场景下的性能比较，证明了该协议的性能改善：(1)中继的发射功率小于终端的发射功率；(2)中继的发射功率大于或等于终端的发射功率。最后，以最小中断概率为目标，提出了一种最优的中继端功率分配方案。版权所有©2013 John Wiley&Sons，Ltd.
In this paper, a new hybrid relaying protocol is investigated for the time division broadcasting protocol. Instead of simply performing amplified‐and‐forward or decode‐and‐forward on the received information of terminals, a well‐designed hybrid relaying protocol, in which network coding (i.e. the bit‐wise XOR) and superposition coding are chosen reasonably to combine the information of the terminals, is employed by the relay to forward the information of terminals. The approximate outage probability for the proposed protocol is derived in closed form, and the tightness of the expression is verified by Monte Carlo simulations. Meanwhile, the achievable diversity of the proposed protocol is analysed. Through both analytic and simulation results, we show that the proposed protocol can always achieve full diversity of two through reasonably selecting between the combining methods at the relay. The performance improvement of the proposed protocol is demonstrated through comparisons with several existing protocols in two different scenarios: (1) the transmitted power of the relay is less than the transmitted power of terminal and (2) the transmitted power of the relay is greater than or equal to the transmitted power of terminal. Finally, an optimal power allocation scheme at the relay is presented for the proposed protocol to minimise the outage probability. Copyright © 2013 John Wiley & Sons, Ltd.