scholarly journals Predictive Relay Selection: A Cooperative Diversity Scheme Using Deep Learning

2021 ◽  
Author(s):  
Wei Jiang ◽  
Hans Dieter Schotten
Keyword(s):  
Deep Learning ◽  
Fading Channels ◽  
Relay Selection ◽  
Cooperative Diversity ◽  
Spatial Diversity ◽  
Fast Time ◽  
Transmission Scheme ◽  
Opportunistic Relaying ◽  
Full Diversity ◽  
Slow Fading Channels

In this paper, we propose a novel cooperative multi-relay transmission scheme for mobile terminals to exploit spatial diversity. By improving the timeliness of measured channel state information (CSI) through deep learning (DL)-based channel prediction, the proposed scheme remarkably lowers the probability of wrong relay selection arising from outdated CSI in fast time-varying channels. It inherits the simplicity of opportunistic relaying by selecting a single relay, avoiding the complexity of multi-relay coordination and synchronization. Numerical results reveal that it can achieve full diversity gain in slow-fading channels and substantially outperforms the existing schemes in fast-fading wireless environments. Moreover, the computational complexity brought by the DL predictor is negligible compared to off-the-shelf computing hardware.

Relay Selection in Cooperative Networks

2010 ◽  
pp. 260-279
Author(s):  
Elzbieta Beres ◽  
Raviraj Adve
Keyword(s):  
Relay Selection ◽  
Cooperative Diversity ◽  
Spatial Diversity ◽  
Cooperative Networks ◽  
Maximal Ratio Combining ◽  
Channel Fading ◽  
Limited Information ◽  
Opportunistic Relaying ◽  
And Performance ◽  
Selection Cooperation

Cooperative diversity has the potential of implementing spatial diversity and mitigating the adverse effects of channel fading without requiring multiple antennas at transmitters and receivers. Traditionally, cooperative diversity is implemented using maximal ratio combining (MRC), where all available nodes relay signals between the source and destination. It has recently been proposed, however, that for each source-destination transmission, only a single best node should be selected to act as a relay. The resulting scheme, referred to as selection cooperation or opportunistic relaying, outperforms MRC schemes and can be implemented in a distributed fashion with limited feedback. This result is not unexpected, as selection requires some (though very limited) information regarding instantaneous channel conditions, while MRC does not. When implemented in a distributed network, however, MRC does require feedback for the synchronization of nodes, rendering a comparison of the two schemes worthwhile and fair. In this chapter, we provide a detailed overview of selection. We begin with a single source-destination pair, and discuss its implementation and performance under various constraints and scenarios. We then discuss a less-common scenario, a multisource network where nodes act both as sources and as relays.

scholarly journals Rate Maximization Using Cooperative Ratio Over Rayleigh Fading Channels

2021 ◽  
Author(s):  
Lavanya Rajagopalan
Keyword(s):  
Power Allocation ◽  
Fading Channels ◽  
Cooperative Diversity ◽  
Spatial Diversity ◽  
Cooperative Transmission ◽  
Total Power ◽  
Destination Node ◽  
Equal Distribution ◽  
Power Simulation ◽  
Diversity Transmission

Cooperative Diversity transmission, a newly upcoming field in the area of wireless communication, has been receiving great attention. This diversity transmission exploits the spatial diversity created by antenna sharing to improve the performance of a wireless network. The working of a cooperative diversity system is such that a source node communicates with a destination node with the help of another partner node. One important question usually raised regarding the operation of this system is that of the amount of power allocation among partnering nodes. Initial stages of research in this area had assumed equal distribution of power resources between the nodes. This approach has been proven as clearly suboptimal. Several works to allocate power optimally are coming up. In this project, optimal power allocation is used as a key approach to analyze the rate performance of the system. This is done with the help of a parameter called cooperative ratio which is the ratio of the power used for cooperative transmission to total power. Simulation results to support the analysis have also been provided.

scholarly journals A Deep Learning-Assisted Cooperative Diversity Method under Channel Aging

2020 ◽  
Author(s):  
Wei Jiang
Keyword(s):  
Deep Learning ◽  
Relay Selection ◽  
Carrier Frequency Offset ◽  
Cooperative Diversity ◽  
Channel State ◽  
Timing Offset ◽  
Multiple User ◽  
Spatially Distributed ◽  
Efficient Scheme ◽  
Single Relay

Single-relay selection is a simple but efficient scheme for cooperative diversity among multiple user devices. However, the wrong selection of the best relay due to aged channel state information (CSI) remarkably degrades its performance, overwhelming this cooperative gain. Multi-relay selection is robust against channel aging but multiple timing offset (MTO) and multiple carrier frequency offset (MCFO) among spatially-distributed relays hinder its implementation in practical systems. In this paper, therefore, we propose a deep learning-based cooperative diversity method coined predictive relay selection (PRS) that chooses a single relay with the largest predicted CSI, which can alleviate the effect of channel aging while avoiding MTO and MCFO. Performance is evaluated analytically and numerically, revealing that PRS clearly outperforms the existing schemes with a negligible complexity burden.

scholarly journals Rate Maximization Using Cooperative Ratio Over Rayleigh Fading Channels

2021 ◽  
Author(s):  
Lavanya Rajagopalan
Keyword(s):  
Power Allocation ◽  
Fading Channels ◽  
Cooperative Diversity ◽  
Spatial Diversity ◽  
Cooperative Transmission ◽  
Total Power ◽  
Destination Node ◽  
Equal Distribution ◽  
Power Simulation ◽  
Diversity Transmission

Cooperative Diversity transmission, a newly upcoming field in the area of wireless communication, has been receiving great attention. This diversity transmission exploits the spatial diversity created by antenna sharing to improve the performance of a wireless network. The working of a cooperative diversity system is such that a source node communicates with a destination node with the help of another partner node. One important question usually raised regarding the operation of this system is that of the amount of power allocation among partnering nodes. Initial stages of research in this area had assumed equal distribution of power resources between the nodes. This approach has been proven as clearly suboptimal. Several works to allocate power optimally are coming up. In this project, optimal power allocation is used as a key approach to analyze the rate performance of the system. This is done with the help of a parameter called cooperative ratio which is the ratio of the power used for cooperative transmission to total power. Simulation results to support the analysis have also been provided.

scholarly journals Relay Selections for Security and Reliability in Mobile Communication Networks over Nakagami-m Fading Channels

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Hongji Huang ◽  
Wanyou Sun ◽  
Jie Yang ◽  
Guan Gui
Keyword(s):  
Fading Channels ◽  
Communication Networks ◽  
Mobile Communication ◽  
Relay Selection ◽  
Direct Transmission ◽  
Transmission Scheme ◽  
Intercept Probability ◽  
Communication Links ◽  
Single Relay ◽  
Better Than

This paper studies the relay selection schemes in mobile communication system over Nakagami-m channel. To make efficient use of licensed spectrum, both single relay selection (SRS) scheme and multirelays selection (MRS) scheme over the Nakagami-m channel are proposed. Also, the intercept probability (IP) and outage probability (OP) of the proposed SRS and MRS for the communication links depending on realistic spectrum sensing are derived. Furthermore, this paper assesses the manifestation of conventional direct transmission scheme to compare with the proposed SRS and MRS ones based on the Nakagami-m channel, and the security-reliability trade-off (SRT) performance of the proposed schemes and the conventional schemes is well investigated. Additionally, the SRT of the proposed SRS and MRS schemes is demonstrated better than that of direct transmission scheme over the Nakagami-m channel, which can protect the communication transmissions against eavesdropping attacks. Additionally, simulation results show that our proposed relay selection schemes achieve better SRT performance than that of conventional direct transmission over the Nakagami-m channel.

scholarly journals A Deep Learning-Assisted Cooperative Diversity Method under Channel Aging

2020 ◽  
Author(s):  
Wei Jiang
Keyword(s):  
Deep Learning ◽  
Relay Selection ◽  
Carrier Frequency Offset ◽  
Cooperative Diversity ◽  
Channel State ◽  
Timing Offset ◽  
Multiple User ◽  
Spatially Distributed ◽  
Efficient Scheme ◽  
Single Relay

Single-relay selection is a simple but efficient scheme for cooperative diversity among multiple user devices. However, the wrong selection of the best relay due to aged channel state information (CSI) remarkably degrades its performance, overwhelming this cooperative gain. Multi-relay selection is robust against channel aging but multiple timing offset (MTO) and multiple carrier frequency offset (MCFO) among spatially-distributed relays hinder its implementation in practical systems. In this paper, therefore, we propose a deep learning-based cooperative diversity method coined predictive relay selection (PRS) that chooses a single relay with the largest predicted CSI, which can alleviate the effect of channel aging while avoiding MTO and MCFO. Performance is evaluated analytically and numerically, revealing that PRS clearly outperforms the existing schemes with a negligible complexity burden.

Single-Carrier Frequency Domain Equalization for Broadband Cooperative Communications

2010 ◽  
pp. 399-427 ◽  
Author(s):  
Tae-Won Yune ◽  
Dae-Young Seol ◽  
Dongsik Kim ◽  
Gi-Hong Im
Keyword(s):  
Fading Channels ◽  
Cooperative Communications ◽  
Cooperative Diversity ◽  
Spatial Diversity ◽  
Block Type ◽  
Channel Tracking ◽  
Single Carrier ◽  
Space Frequency ◽  
Pilot Design ◽  
Network Form

Cooperative diversity is an effective technique to combat the fading phenomena in wireless communications without additional complexity of multiple antennas. Multiple terminals in the network form a virtual antenna array in a distributed fashion. Even though each of them is equipped with only one antenna, spatial diversity gain can be achieved through cooperation. In this chapter, we discuss relay-assisted single carrier transmissions extending conventional transmit diversity schemes. We focus on distributed space-frequency block coded single carrier transmission, in order to operate over fast fading channels. A pilot design technique is also discussed for channel estimation of this single carrier cooperative system, which shows better channel tracking performance than conventional block-type channel estimations. In addition, spectral efficient cooperative diversity protocols are presented, where the users access a relay simultaneously or transmit superposed data blocks. Interference from the other user is effectively removed by using an iterative detection technique.

Sign in / Sign up

Export Citation Format

Share Document