scholarly journals LTE-U and Wi-Fi hidden terminal problem: How serious is it for deployment consideration?

2018 ◽  
Author(s):  
Anand M. Baswade ◽  
Touheed Anwar Atif ◽  
Bheemarjuna Reddy Tamma ◽  
A Antony Franklin
Keyword(s):  
Hidden Terminal

scholarly journals Cooperative Spectrum Sensing Based on Convolutional Neural Networks

2021 ◽  
Vol 11 (10) ◽  
pp. 4440
Author(s):  
Youheng Tan ◽  
Xiaojun Jing
Keyword(s):  
Neural Networks ◽  
Spectrum Sensing ◽  
Convolutional Neural Networks ◽  
Cooperative Spectrum Sensing ◽  
Signal To Noise Ratio ◽  
Majority Voting ◽  
Signal To Noise ◽  
Hidden Terminal ◽  
Simulation Results ◽  
Sensing Performance

Cooperative spectrum sensing (CSS) is an important topic due to its capacity to solve the issue of the hidden terminal. However, the sensing performance of CSS is still poor, especially in low signal-to-noise ratio (SNR) situations. In this paper, convolutional neural networks (CNN) are considered to extract the features of the observed signal and, as a consequence, improve the sensing performance. More specifically, a novel two-dimensional dataset of the received signal is established and three classical CNN (LeNet, AlexNet and VGG-16)-based CSS schemes are trained and analyzed on the proposed dataset. In addition, sensing performance comparisons are made between the proposed CNN-based CSS schemes and the AND, OR, majority voting-based CSS schemes. The simulation results state that the sensing accuracy of the proposed schemes is greatly improved and the network depth helps with this.

Hidden Terminal Aware Clustering for Large-scale D2D Networks

2018 ◽  
Vol 107 (3) ◽  
pp. 1367-1381 ◽  
Author(s):  
Seung Hyong Rhee ◽  
Xiaoying Lei
Keyword(s):  
Large Scale ◽  
Hidden Terminal

An Asynchronous Multi-Channel MAC Protocol Based on Cooperation Mechanism in Vehicular AdHoc Network

2015 ◽  
Vol 713-715 ◽  
pp. 1294-1298
Author(s):  
Xin Yun Li ◽  
Lun Tang
Keyword(s):  
Network Reliability ◽  
Mac Protocol ◽  
High Mobility ◽  
Collision Probability ◽  
Delivery Ratio ◽  
Adhoc Network ◽  
Cooperation Mechanism ◽  
Hidden Terminals ◽  
Hidden Terminal ◽  
Channel Environment

To solve the problem of vehicle adhoc network reliability is not high and multi-channel hidden terminals, we propose a multi-channel MAC protocol CAMP(cooperation-based asynchronous multi-channel MAC protocol) based mechanism for asynchronous cooperation in VANET. CAMP add to cooperation mechanisms in asynchronous multi-channel environment, the proposed scheme nodes cooperation in order to obtain the channel state information and status information to other nodes, thus a good solution to the hidden terminal problem multichannel transmission process, to achieve high mobility environment under the reliable transmission of data. The simulation results show that CAMP has better performance than IEEE 1609.4 standard, AMCP protocol, AMCMAC protocol on collision probability of SCH, safety messages delivery ratio.

Benchmarks Comparing for IEEE 802.15.4 with Hidden Terminals

2011 ◽  
Vol 403-408 ◽  
pp. 1950-1955
Author(s):  
Zhen Hua Wu ◽  
Xiao Chuan Huang ◽  
Jian Shu
Keyword(s):  
Wireless Network ◽  
Network Performance ◽  
Ieee 802.15.4 ◽  
Performance Degradation ◽  
Data Generation ◽  
Main Research ◽  
Network Load ◽  
Hidden Terminals ◽  
Hidden Terminal ◽  
Packet Length

Hidden terminal problem (HTP) has been a main research aspect in the field of wireless network performance analyzing and testing since it was formulated in 1970s. This article conducts a relatively comprehensive testing on the performance degradation of IEEE 802.15.4 network, which is beacon enabled, star architecture and using slotted CSMA/CA algorithm, due to HTP. All simulate experiments are conducted in NS-2. The experiment results show that: data generation form has little impact on HTP; packet length has more effect on HTP than the number of packets; HTP is trivial when network load is lower than 10%; acknowledge mechanism enlarges extremely HTP; increasing the value of beacon order (BO) is help for alleviating HTP when BO value is small than 6. These conclusions are useful for understanding the features of HTP in IEEE 802.15.4 networks.

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