Outage-optimal relay strategy under outdated channel state information in decode-and-forward cooperative communication systems

2015 ◽  
Vol 9 (4) ◽  
pp. 441-450 ◽  
Author(s):  
Li Fei ◽  
Jun Zhang ◽  
Qiang Gao ◽  
Xiao-Hong Peng
Keyword(s):  
Channel State Information ◽  
Cooperative Communication ◽  
Communication Systems ◽  
Decode And Forward ◽  
Channel State ◽  
State Information ◽  
Outdated Channel State Information

scholarly journals A Joint Optimization Scheme of Resource Allocation in Downlink NOMA with Statistical Channel State Information

2020 ◽  
Author(s):  
Lei Xu ◽  
Jing Yi Yao ◽  
Jing Cai ◽  
Yu Hong Fang ◽  
Hui Xiao Li
Keyword(s):  
Power Allocation ◽  
Channel State Information ◽  
Communication Systems ◽  
Multiple Access ◽  
Joint Optimization ◽  
System Throughput ◽  
Optimization Scheme ◽  
Channel State ◽  
State Information ◽  
User Grouping

Abstract In a real communication scenario, it is very difficult to obtain the real-time Channel State Information(CSI) accurately, so the communication systems with statistical CSI have been researched. In order to maximize the throughput of the downlink Non-Orthogonal Multiple Access (NOMA) system with statistical CSI, the formula of system throughput is derived at first. Then, according to the combinatorial characteristics of the original optimization problem, it is divided into two subproblems, that is user grouping and power allocation. At last, a joint optimization scheme is proposed. In which, Genetic algorithm is introduced to solve the subproblem of power allocation, and Hungarian algorithm is introduced to solve the subproblem of user grouping. By comparing the ergodic date rate of NOMA users with statistical CSI and perfect CSI, the effectiveness of the statistical CSI sorting is verified. Compared with the Orthogonal Multiple Access (OMA) scheme, the NOMA scheme with the fixed user grouping scheme and the random user grouping scheme, the proposed scheme can effectively improve the system throughput.

Cognitive MIMO Relaying Networks With Primary User's Interference and Outdated Channel State Information

2014 ◽  
Vol 62 (12) ◽  
pp. 4241-4254 ◽  
Author(s):  
Yuzhen Huang ◽  
Fawaz S. Al-Qahtani ◽  
Caijun Zhong ◽  
Qihui Wu ◽  
Jinlong Wang ◽  
...  
Keyword(s):  
Channel State Information ◽  
Channel State ◽  
State Information ◽  
Outdated Channel State Information ◽  
Relaying Networks
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