Concurrent Transmission versus Time Sharing in
Gaussian Interference Channels
Meng Zheng
†‡
, Jafar Mohammadi
★⋄
, Sławomir Sta
´
nczak
★⋄
,HaibinYu
†
†
Lab of Industrial Control Network and System, Shenyang Institute of Automation
Chinese Academy of Sciences, Shenyang, 110016 China
‡
Graduate School of Chinese Academy of Sciences, Beijing, 100039 China
★
Fraunhofer Heinrich Hertz Institute, Berlin, 10587 Germany
⋄
Heinrich-Hertz-Lehrstuhl f
¨
ur Informationstheorie und Theoretische Informationstechnik
Technische Universitat Berlin, Einsteinufer 27, 10587 Germany
Abstract—A key to efficient mobile communication networks is
an efficient utilization of scarce resources, which includes mech-
anisms for resource allocation and interference management. In
practice, time sharing methods such as Time Division Multiple
Access (TDMA) are often exploited to create orthogonal connec-
tions. TDMA schemes however are inflexible and not suitable for
decentralized implementation. In this context, approaches based
on concurrent transmissions in the same frequency spectrum
admitting the interference offer a promising and attractive
alternative. Yet their performances deteriorate dramatically if the
underlying interference coefficients are relatively large. Assuming
a Gaussian Interference Channel (GIC), this paper characterizes
the so-called TDMA region which is defined as a set of all
interference coefficient matrices for which TDMA outperforms
concurrent transmissions. We use the dimensional lifting method
to prove the convexity and monotonicity of the TDMA region,
which provides some insights into the scheduling design under
uncertainty with respect to the interference coefficients. Finally,
the analysis is used to develop strategies for resource allocation
in STDMA-based wireless networks.
I. INTRODUCTION
Interference is a prominent phenomenon in wireless net-
works where multiple uncoordinated users share a common
channel. Concurrent transmission with power control [1]-[4]
and orthogonal transmission in time or frequency [5]-[8] are
two widely-considered schemes for interference management
in wireless networks. Each of these two schemes has its own
drawbacks.
Orthogonal transmission schemes such as TDMA methods
neglect potential opportunities for transmission when the in-
terference is very weak. Furthermore, they are either inflexible
or to a large extent not suitable for decentralized wireless
networks because, in such networks, the maintenance of
orthogonality requires extensive coordination/synchronization,
which in turn causes a lot of signaling overhead. In contrast,
concurrent transmission may lead to poor throughput perfor-
mance when the interference is relatively strong. Therefore,
we believe that quantitative study on the ”watershed” of inter-
ference level between concurrent transmission and orthogonal
transmission is highly valuable in both academy and industry.
However, to the best of our knowledge, there is still vacancy
in the study on this topic.
The basic model for investigating this problem is the Gaus-
sian interference channel (GIC) shown in Fig. 1, where each
user (link) is a source-destination pair where the source signal,
the interference from other users, and the Gaussian noise are
collected at its receiver [9]. The GIC capacity remains an open
problem except for the strong and very strong interference
cases [10]-[11]. A lot of existing contributions devote to
the derivation for outer bounds of the GIC capacity(see for
example [12]-[14] and references therein). The lack of under-
standing of the capacity has motivated a pragmatic approach
whereby we simply assume that communication pairs in Fig. 1
are coded separately and the interference is treated as noise. In
this paper TDMA is chosen as a representative of orthogonal
transmission schemes to compare with concurrent transmission
in terms of maximal throughput. For given transmit powers
of users, the TDMA region, which is the set of interference
matrices for which TDMA scheme outperforms concurrent
transmission, is for the first time characterized. Then by
the dimensional lifting method we prove the convexity and
monotonicity of the TDMA region, which provides quite
useful insights for practical engineering. Finally, we exploit
this work to develop strategies for the resource allocation
in STDMA-based wireless networks. More specifically, the
whole resource allocation problem is heuristically decomposed
into two subproblems: building active sets and resource alloca-
tion among active sets; while the analysis gained above helps
to design the building block, which conducts admission control
of potential interfering users, of the former subproblem.
II. G
AUSSIAN INTERFERENCE CHANNEL
We consider a continuous alphabet interference channel
corrupted by the Gaussian noise (see Fig. 1). The inputs X
i
and outputs Y
i
of the GIC are real numbers related by
Y
i
= X
i
+
n
∑
j=1, j∕=i
√
a
ji
X
j
+ Z
i
, 1 ≤ i ≤n
where
√
a
ji
and Z
i
are nonnegative interference coefficients
and and independent Gaussian noise random variables with
zero mean and unit variance, respectively. The transmit power
of the input X
i
is P
i
, i = 1,...,n. In what follows, let A =
978-1-4673-0971-4/12/$31.00 ©2012 IEEE
资源评论
weixin_38686231
- 粉丝: 10
- 资源: 917
最新资源
- C#三轴涂胶软件源码：专业级功能集成，高效生产管理与控制，实时报警监控与用户权限管控,高效精准的C#三轴涂胶软件源码：具备轨迹编辑、自动纠偏等功能与用户权限管理,C#三轴涂胶软件源码，该软件已经在客户
- 基于HTML5 Canvas的3D频谱音乐歌词同步播放器设计源码
- 永磁同步电机驱动器的自适应SDRE非线性无传感器速度控制策略（Matlab&Simulink仿真实现研究）,永磁同步电机驱动器的自适应SDRE非线性无传感器速度控制策略及Matlab&Simulink
- 基于重力传感器与客流相机技术的上海零售展人货匹配客户端设计源码
- 基于MBD开发的电动汽车主驱电机控制器模型与量产材料研究（a38）,基于MBD开发的电动汽车主驱电机控制器模型与量产材料研究,基于MBD开发的电动汽车主驱电机控制器模型及开发材料（a38?），量产模
- 基于Vue框架的洗衣卡前端页面设计源码
- 基于Vue框架的刘汉龙院士团队后台管理系统设计源码
- 基于位错密度的晶体塑性模型：微观结构与力学行为的关联研究,基于位错密度分析的多角度晶体塑性模型探究,基于位错密度的晶体塑性模型 ,基于位错密度的晶体塑性模型; 晶体塑性; 位错密度; 模型,基于位错密
- 高质量10bit SAR ADC电路设计文档：详尽流程、GPDK工艺与Virtuoso仿真全配套资源,高性能10bit SAR ADC电路设计文档，含详细仿真与gpdk工艺，可直接导入Virtuoso
- 基于陈自鸣先生研究成果的牛码五笔输入法设计源码
- 基于Java的Android蓝牙串口通信库设计源码
- 基于Java和HTML技术的包头师范农产品溯源项目设计源码
- 电力系统暂态稳定分析：基于Matlab的三机九节点系统模拟与功能详解（含临界切除时间考量）报告（共24页）,电力系统暂态稳定分析：基于Matlab的三机九节点系统模拟与临界切除时间考量报告,电力系统暂
- V2G电动汽车双向充电桩电路仿真：SVPWM控制开关信号，电压外环电流内环实现整流逆变及功率输出，直流侧充放电模块设计，buck boost电路恒压恒流控制 ,基于SVPWM控制和双层调节系统的电动汽
- AC DC混合微电网Simulink模型：大型交直流混合微电网与双向功率变换器控制策略研究,AC DC混合微电网Simulink模型：交直流双向功率变换与控制策略研究,AC DC混合微电网Simuli
- 昆仑通态MCGS与欧姆龙E5CC温控器通讯：PID控制及输出启停功能实现,昆仑通态MCGS与欧姆龙E5CC温控器通讯：PID控制及输出启停功能实现,昆仑通态MCGS与欧姆龙E5CC温控器通讯+PID模
资源上传下载、课程学习等过程中有任何疑问或建议，欢迎提出宝贵意见哦~我们会及时处理！
点击此处反馈
