| 摘要: |
| 设备到设备(D2D,device to device)技术是当今无线通信研究的关键技术之一.在单小区场景下引入了多跳D2D通信系统功率控制算法.在该场景下,多条D2D链路间通过复用频带来通信,同一D2D链路的用户采用两时隙的两跳解码转发中继(DF,Decode and forward)方式传输信息.不同链路两时隙之间非完全同步下,使用了同一频带的中继会相互干扰.作者提出的功率控制算法先引入松弛因子得到功率闭式解,通过迭代优化该问题中用户的发射功率,来减少中继间的同频干扰.最后,通过数值仿真证明,在D2D系统中加入该功率控制算法后,可一定程度上提升用户传输速率. |
| 关键词: D2D 两跳中继 功率控制 |
| DOI： |
| 分类号: |
| 基金项目:上海市教育委员会科研创新项目(12ZZ126);上海师范大学重点学科(DZL126) |
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| Distribute algorithm for two-hops Device-to-Device communications underlaying cellular networks |
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CHEN Zhaoyu1, LUO Hanwen2
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1.College of Information,Mechanical and Electrical Engineering,Shanghai Normal University;2.Electronic and Electrical Engineering,Shanghai Jiao Tong University
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| Abstract: |
| This paper proposed a power control algorithm for multi-hops device to device communication system under the single cellular networks.Different D2D links communicate by the shared band and users in one D2D links transmit message in two-hop Decode-and-forward mode.D2D users among different links which share the same band in asynchronous mode would get mutual interference.We use a proposal algorithm to approximate the optimistic solution with relaxation factor method,firstly get the closed expression of optimistic power,then we modify the transmission power to decrease the co-channel interference.At last,the simulation results verify the correctness of proposed power control algorithm and the improvement of system sum rate. |
| Key words: D2D two-hop Decode-and-forward power control |
