scholarly journals Dual-hop Relaying Networks for Short-Packet URLLCs: Performance analysis and Optimization

2021 ◽  
Author(s):  
Nguyen Thi Yen Linh ◽  
Tu Ngo Hoang ◽  
Pham Ngoc Son ◽  
Vo Nguyen Quoc Bao
Keyword(s):  
Fading Channels ◽  
Optimization Problems ◽  
Signal To Noise Ratio ◽  
Error Rates ◽  
Decode And Forward ◽  
Location Optimization ◽  
Maximum Ratio Combining ◽  
System A ◽  
Qualitative Conclusion ◽  
Short Packet

<div>This paper investigates short-packet communications for the dual-hop decode-and-forward relaying system to facilitate ultra-reliable and low-latency communications. In this system, a selected relay having the highest signal-to-noise ratio (SNR) serves as a forwarder to support the unavailable direct link between the source and destination, whereas a maximum ratio combining technique is leveraged at the destination to achieve the highest diversity gain. Approximated expressions of end-to-end (e2e) block error rates (BLERs) are derived over quasi-static Rayleigh fading channels and the finite-blocklength regime. To gain more insights about the performance behavior in the high-SNR regime, we provide the asymptotic analysis with two approaches, from which the qualitative conclusion based on the diversity order is made. Furthermore, the power allocation and relay location optimization problems are also considered to minimize the asymptotic e2e BLER under the configuration constraints. Our analysis is verified through Monte-Carlo simulations, which yield the system parameters' impact on the system performance.</div>

scholarly journals Dual-hop Relaying Networks for Short-Packet URLLCs: Performance analysis and Optimization

2021 ◽  
Author(s):  
Nguyen Thi Yen Linh ◽  
Tu Ngo Hoang ◽  
Pham Ngoc Son ◽  
Vo Nguyen Quoc Bao
Keyword(s):  
Fading Channels ◽  
Optimization Problems ◽  
Signal To Noise Ratio ◽  
Error Rates ◽  
Decode And Forward ◽  
Location Optimization ◽  
Maximum Ratio Combining ◽  
System A ◽  
Qualitative Conclusion ◽  
Short Packet

<div>This paper investigates short-packet communications for the dual-hop decode-and-forward relaying system to facilitate ultra-reliable and low-latency communications. In this system, a selected relay having the highest signal-to-noise ratio (SNR) serves as a forwarder to support the unavailable direct link between the source and destination, whereas a maximum ratio combining technique is leveraged at the destination to achieve the highest diversity gain. Approximated expressions of end-to-end (e2e) block error rates (BLERs) are derived over quasi-static Rayleigh fading channels and the finite-blocklength regime. To gain more insights about the performance behavior in the high-SNR regime, we provide the asymptotic analysis with two approaches, from which the qualitative conclusion based on the diversity order is made. Furthermore, the power allocation and relay location optimization problems are also considered to minimize the asymptotic e2e BLER under the configuration constraints. Our analysis is verified through Monte-Carlo simulations, which yield the system parameters' impact on the system performance.</div>

scholarly journals Research on Cluster Overlap and Non-overlap Region for 5G-IoV Networks with NOMA

2021 ◽  
Author(s):  
Jinyuan Gu ◽  
Guoan Zhang ◽  
Haibin Lv ◽  
Wei Duan
Keyword(s):  
Fading Channels ◽  
Information Exchange ◽  
Signal Transmission ◽  
Cluster Head ◽  
High Signal ◽  
Transmission Scheme ◽  
Decode And Forward ◽  
Processing Technologies ◽  
Maximum Ratio Combining ◽  
Overlap Region

Abstract As a multi hop self-organizing network, wireless sensor network (WSN) has the ability to cooperatively sense, collect and process the information of the sensed objects. The applications of WCN in 5G-based Internet of Vehicles (5G-IoV), using information fusion and intelligent information processing technologies, can obtain more reliable and accurate detection parameters, which has been widely concerned. However, the massive connectivity and information exchange in 5G-IoV pose great challenges to the bandwidth efficiency. In order to overcome these issues in 5G-IoV networks, a performance enhanced scheme based on non-orthogonal multiple access (NOMA) is proposed. In the proposed scheme, different vehicle locations are respectively discussed, i.e., whether in the overlap region of cluster head vehicles (CHVs). In particular, different to conventional works, each receiving node only decodes the desired signal to avoid performance loss provided from the poor channel quality limitation. On the other hand, all CHVs decode-and-forward (DF) new superposition coded signals with new power allocation factors, while that the maximum ratio combining (MRC) is utilized at receivers to further improve the ergodic sum-rate (SR) and probability of conflict. The closed-form expressions of ergodic SR for our proposed scheme are analyzed under the independent Rayleigh fading channels. Numerical results corroborating our theoretical analysis show that the superposition coded signal transmission scheme applied to the proposed NOMA-IoV improves the ergodic SR performance significantly compared with the existing works, especially for the high signal-to-noise (SNR) region.

scholarly journals A Comparative Study of Relaying Schemes with Decode and Forward over Nakagami- Fading Channels

2011 ◽  
Vol 2011 ◽  
pp. 1-14 ◽  
Author(s):  
George C. Alexandropoulos ◽  
Agisilaos Papadogiannis ◽  
Paschalis C. Sofotasios
Keyword(s):  
Closed Form ◽  
Fading Channels ◽  
Signal To Noise Ratio ◽  
Wireless Systems ◽  
Nakagami Fading ◽  
Decode And Forward ◽  
Channel State ◽  
Modulation Methods ◽  
Nakagami Fading Channels ◽  
Analytical Expressions

Although relaying can be very beneficial for wireless systems, understanding which relaying schemes can achieve specific performance objectives under realistic fading is crucial. In this paper we present a general framework for modeling and evaluating the performance of dual-hop decode-and-forward (DF) relaying schemes over independent and not necessarily identically distributed (INID) Nakagami- fading channels. We obtain closed-form expressions for the statistics of the instantaneous output signal-to-noise ratio of repetitive transmission with selection diversity. Furthermore, we present a unified statistical overview of other three significant relaying schemes with DF, one based on repetitive transmission with maximal-ratio diversity and the other two based on relay selection (RS). To compare the considered schemes, we present closed-form and analytical expressions for the outage probability and the average symbol error probability under various modulation methods, respectively. Importantly, it is shown that when the channel state information for RS is perfect, RS-based schemes always outperform repetitive ones. Furthermore, when the direct link between the source and the destination nodes is sufficiently strong, relaying may not result in any gains, and it should be switched off.

scholarly journals Secrecy Performance Analysis of Half/Full Duplex AF/DF Relaying in NOMA Systems Over κ - μ Fading Channels

2021 ◽  
Author(s):  
Nesrine Zaghdoud ◽  
Adel Ben Mnaouer ◽  
Hatem Boujemaa ◽  
Farid Touati
Keyword(s):  
Fading Channels ◽  
Signal To Noise Ratio ◽  
Multipath Fading ◽  
Full Duplex ◽  
High Signal ◽  
Secrecy Outage Probability ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Special Cases ◽  
Secrecy Outage

Abstract Although the progress in understanding 5G and beyond techniques such as Non-Orthogonal Multiple Access (NOMA) and full-duplex techniques has been overwhelming, still analyzing the security aspects of such systems under different scenarios and settings is an important concern that needs further exploration. In particular, when considering fading in wiretap channels and scenarios, achieving secrecy has posed many challenges. In this context, we propose to study the physical layer security (PLS) of cooperative NOMA (C-NOMA) system using the general fading distribution κ - μ. This distribution facilitates mainly the effect of light-of-sight as well as multipath fading. It also includes multiple distributions as special cases like: Rayleigh, Rice, Nakagami-m which help to understand the comportment of C-NOMA systems under different fading parameters. The use of Half-Duplex and Full-Duplex communication is also investigated for both Amplify-and-forward (AF) and Decode-and-Forward (DF) relaying protocols. To characterize the secrecy performance of the proposed C-NOMA systems, closed form expressions of the Secrecy Outage Probability (SOP) and the Strictly Positive Secrcey Capacity (SPSC) metrics for the strong and weak users are given for high signal-to-noise ratio (SNR) due to the intractable nature of the exact expressions. Based on the analytical analysis, numerical and simulation results are given under different network parameters.

scholarly journals Partial Relay Selection for Secure Cooperative NOMA Networks

2021 ◽  
Author(s):  
Wided Hadj Alouane
Keyword(s):  
Fading Channels ◽  
Relay Selection ◽  
Signal To Noise Ratio ◽  
Secrecy Outage Probability ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Partial Relay Selection ◽  
Asymptotic Expressions ◽  
Selection For ◽  
Secrecy Outage

Abstract In this paper, we investigate physical layer security of multi-relay non-orthogonal multiple access (NOMA) networks with partial relay selection considering decode-and-forward (DF) and amplify-and-forward (AF) protocols. We propose a partial relay scheme aiming to select the best relay based on the highest signal-to-noise-ratio (SNR) of the first link. We derive new exact and asymptotic expressions for strictly positive secrecy capacity (SPSC) and secrecy outage probability (SOP) considering Rayleigh fading channels. Numerical results demonstrate that AF and DF provide almost a similar secrecy performance. Moreover, they prove that partial relay selection improves SPSC and reduces SOP when the relay-cluster is closer to the legitimate receiver.

scholarly journals Research on Cluster Overlap and Non-overlap Region for 5G-IoV Networks with NOMA

2020 ◽  
Author(s):  
Jinyuan Gu ◽  
Guoan Zhang ◽  
Haibin Lv ◽  
Wei Duan
Keyword(s):  
Fading Channels ◽  
Information Exchange ◽  
Signal Transmission ◽  
Cluster Head ◽  
High Signal ◽  
Transmission Scheme ◽  
Decode And Forward ◽  
Processing Technologies ◽  
Maximum Ratio Combining ◽  
Overlap Region

Abstract As a multi hop self-organizing network, wireless sensor network (WSN) has the ability to cooper- atively sense, collect and process the information of the sensed objects. The applications of WCN in 5G-based Internet of V ehicles (5G-IoV), using information fusion and intelligent information processing technologies, can obtain more reliable and accurate detection parameters, which has been widely concerned. However, the massive connectivity and information exchange in 5G-IoV pose great challenges to the bandwidth efficiency. In order to overcome these issues in 5G-IoV networks, a performance enhanced scheme based on non-orthogonal multiple access (NOMA) is proposed. In the proposed scheme, different vehicle locations are respectively discussed, i.e., whether in the overlap region of cluster head vehicles (CHVs). In particular, different to conventional works, each receiving node only decodes the desired signal to avoid performance loss provided from the poor channel quality limitation.On the other hand, all CHVs decode-and-forward (DF) new superposition coded signals with new power allocation factors, while that the maximum ratio combining (MRC) is utilized at receivers to further improve the ergodic sum-rate (SR) and probability of conflict. The closed-form expressions of ergodic SR for our proposed scheme are analyzed under the independent Rayleigh fading channels. Numerical results corroborating our theoretical analysis show that the superposition coded signal transmission scheme applied to the proposed NOMA-IoV improves the ergodic SR performance significantly compared with the existing works, especially for the high signal-to-noise (SNR) region.

Performance Analysis for Hybrid Cooperative Beamforming in Wireless Relay Networks

2014 ◽  
Vol 543-547 ◽  
pp. 3435-3440
Author(s):  
Chun Lei Han ◽  
Mei Lu Lin ◽  
Ye Yang
Keyword(s):  
Fading Channels ◽  
Lower Bounds ◽  
Rayleigh Fading ◽  
Signal To Noise Ratio ◽  
Upper And Lower Bounds ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Average Channel Capacity ◽  
Wireless Relay ◽  
Cooperative Beamforming

This paper considers a relay-assisted hybrid cooperative beamforming system in independent and identically Rayleigh fading channels. In this system, each relay can adaptively employ amplify-and-forward (AF) or decode-and-forward (DF) protocol for maximizing the instantaneous signal-to-noise ratio (SNR). Tight upper and lower bounds for the outage probability have been derived in closed form, based on which we investigate the achievable diversity of the hybrid cooperative beamforming system. We also present the corresponding upper and lower bounds of the average channel capacity. Numerical results are provided to validate our theoretic analyses.

scholarly journals Research on cluster overlap and non-overlap region for 5G-IoV networks with NOMA

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Jinyuan Gu ◽  
Guoan Zhang ◽  
Haibin Lv ◽  
Wei Duan
Keyword(s):  
Fading Channels ◽  
Information Exchange ◽  
Signal Transmission ◽  
Cluster Head ◽  
High Signal ◽  
Transmission Scheme ◽  
Decode And Forward ◽  
Processing Technologies ◽  
Maximum Ratio Combining ◽  
Overlap Region

AbstractAs a multi hop self-organizing network, wireless sensor network has the ability to cooperatively sense, collect and process the information of the sensed objects. The applications of WCN in 5G-based Internet of Vehicles (5G-IoV), using information fusion and intelligent information processing technologies, can obtain more reliable and accurate detection parameters, which has been widely concerned. However, the massive connectivity and information exchange in 5G-IoV pose great challenges to the bandwidth efficiency. In order to overcome these issues in 5G-IoV networks, a performance enhanced scheme based on non-orthogonal multiple access (NOMA) is proposed. In the proposed scheme, different vehicle locations are respectively discussed, i.e., whether in the overlap region of cluster head vehicles (CHVs). In particular, different to conventional works, each receiving node only decodes the desired signal to avoid performance loss provided from the poor channel quality limitation. On the other hand, all CHVs decode-and-forward new superposition coded signals with new power allocation factors, while that the maximum ratio combining is utilized at receivers to further improve the ergodic sum-rate (SR) and probability of conflict. The closed-form expressions of ergodic SR for our proposed scheme are analyzed under the independent Rayleigh fading channels. Numerical results corroborating our theoretical analysis show that the superposition coded signal transmission scheme applied to the proposed NOMA-IoV improves the ergodic SR performance significantly compared with the existing works, especially for the high signal-to-noise region.

scholarly journals Symbol Error Probability of DF Relay Selection over Arbitrary Nakagami-mFading Channels

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
George C. Alexandropoulos ◽  
Paschalis C. Sofotasios ◽  
Khuong Ho-Van ◽  
Steven Freear
Keyword(s):  
Fading Channels ◽  
Relay Selection ◽  
Error Probability ◽  
Signal To Noise Ratio ◽  
Moment Generating Function ◽  
Symbol Error Probability ◽  
Decode And Forward ◽  
Shift Keying ◽  
Relaying Systems ◽  
The Moment

We present a new analytical expression for the moment generating function (MGF) of the end-to-end signal-to-noise ratio of dual-hop decode-and-forward (DF) relaying systems with relay selection when operating over Nakagami-mfading channels. The derived MGF expression, which is valid for arbitrary values of the fading parameters of both hops, is subsequently utilized to evaluate the average symbol error probability (ASEP) ofM-ary phase shift keying modulation for the considered DF relaying scheme under various asymmetric fading conditions. It is shown that the MGF-based ASEP performance evaluation results are in excellent agreement with equivalent ones obtained by means of computer simulations, thus validating the correctness of the presented MGF expression.

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