scholarly journals The Effect of Channel State Information on Optimum Energy Allocation and Energy Efficiency of Cooperative Wireless Transmission Systems

2006 ◽  
Author(s):  
Jie Yang ◽  
D. Richard Brown
Keyword(s):  
Energy Efficiency ◽  
Channel State Information ◽  
Energy Allocation ◽  
Wireless Transmission ◽  
Channel State ◽  
Transmission Systems ◽  
State Information ◽  
Optimum Energy

scholarly journals On the Performance of Battery-Assisted PS-SWIPT Enabled DF Relaying

Information ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 165 ◽  
Author(s):  
Zhipeng Liu ◽  
Guangyue Lu ◽  
Yinghui Ye ◽  
Liqin Shi
Keyword(s):  
Energy Efficiency ◽  
Computer Simulations ◽  
Channel State Information ◽  
Power Splitting ◽  
Power Transfer ◽  
Decode And Forward ◽  
Channel State ◽  
Relay System ◽  
State Information ◽  
Analytical Results

Compared with the conventional simultaneous wireless information and power transfer (SWIPT) based relaying with “harvest-then-forward” protocol, the battery-assisted SWIPT relaying is more practical and powerful due to the joint use of the harvested energy and supplementary battery. However, to the best of our knowledge, the performance of a battery-assisted power splitting (PS)-SWIPT decode-and-forward (DF) relay system has not been studied. In this paper, for a given amount of energy from the relay’s battery, we propose to maximize the outage and ergodic capacities by optimizing the static and dynamic PS ratios that rely on statistical and instantaneous channel state information (CSI), respectively, and derive their corresponding outage and ergodic capacities. Computer simulations validate our analytical results and demonstrate the advantages of the dynamic PS over the static PS in terms of the outage and ergodic capacities, as well as the energy efficiency.

scholarly journals Performance Analysis of MEC Based on NOMA under Imperfect CSI with Eavesdropper

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Xuehua Li ◽  
Yingjie Pei ◽  
Huan Jiang ◽  
Xinwei Yue ◽  
Yafei Wang ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Channel State Information ◽  
Multiple Access ◽  
System Throughput ◽  
Secrecy Outage Probability ◽  
Imperfect Csi ◽  
Channel State ◽  
State Information ◽  
Secrecy Outage ◽  
The Impact

Mobile edge computing (MEC) is becoming more and more popular because of improving computing power in virtual reality, augmented reality, unmanned driving, and other fields. This paper investigates a nonorthogonal multiple access- (NOMA-) based MEC system, which is under imperfect channel state information (ipCSI). In this system model, a pair of users offloads their tasks to the MEC server with the existence of an eavesdropper (Eve). To evaluate the impact of Eve on the performance of the NOMA-MEC system, the secrecy outage probability (SOP) expressions for two users with the conditions of imperfect CSI and perfect channel state information (pCSI) are derived. In addition, both throughput and energy efficiency are discussed in the delay-limited transmission mode. Simulation results reveal that (1) due to the influence of channel estimation errors, the secrecy outage behaviors of two users under ipCSI conditions are worse than those of users with pCSI; (2) the secrecy performance of NOMA-MEC is superior to orthogonal multiple access- (OMA-) aided MEC systems; and (3) the NOMA-MEC systems have the ability to attain better system throughput and energy efficiency compared with OMA-MEC.

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