scholarly journals Application of interference alignment in fullduplex D2D communications

2018 ◽  
Vol 189 ◽  
pp. 04003
Author(s):  
Bei Ma ◽  
Zhigang Zhang ◽  
Ruirui Chen
Keyword(s):  
Null Space ◽  
Interference Suppression ◽  
Interference Alignment ◽  
Mutual Interference ◽  
The Self ◽  
Full Duplex ◽  
System Throughput ◽  
D2d Communications ◽  
Half Duplex ◽  
Suppression Method

As compared with the wireless half-duplex (HD) transmission, the wireless full-duplex (FD) transmission can potentially double the system throughput if the self-interference can be efficiently cancelled. Accordingly, this paper proposed an interference alignment (IA)-based self-interference suppression method for the FD D2D bidirectional communications. The self-interference and mutual interference are aligned into the null-space at the receiver, and then suppressed by the receive matrices. Performance evaluation demonstrates the effectiveness of proposed self-interference suppression algorithm for the FD D2D networks.

scholarly journals Energy Efficiency Maximization of Full-Duplex and Half-Duplex D2D Communications Underlaying Cellular Networks

2016 ◽  
Vol 2016 ◽  
pp. 1-15 ◽  
Author(s):  
Yiliang Chang ◽  
Hongbin Chen ◽  
Feng Zhao
Keyword(s):  
Energy Efficiency ◽  
Cellular Networks ◽  
Optimization Problem ◽  
Optimization Method ◽  
Full Duplex ◽  
Noncooperative Game ◽  
D2d Communications ◽  
Half Duplex ◽  
Game Theoretic ◽  
Lower Complexity

Earlier works have studied the energy efficiency (EE) of half-duplex Device-to-Device (D2D) communications. However, the EE of full-duplex D2D communications underlaying cellular networks which undergoes residual self-interference (SI) has not been investigated. In this paper, we focus on the EE of full-duplex D2D communications with uplink channel reuse and compare it with the half-duplex counterpart, aiming to show which mode is more energy-efficient. Our goal is to find the optimal transmission powers to maximize the system EE while guaranteeing required signal-to-interference-plus-noise ratios (SINRs) and transmission power constraints. The optimal power allocation problem is modeled as a noncooperative game, in which each user equipment (UE) is self-interested and wants to maximize its own EE. An optimal iterative bisection-alternate optimization method is proposed to solve the optimization problem from the noncooperative game-theoretic perspective. Simulation results show that the proposed method can achieve EE close to that obtained by an existing method but with lower complexity in half-duplex D2D communications underlaying cellular networks. Moreover, the full-duplex D2D communications underlaying cellular networks outperform the half-duplex D2D communications underlaying cellular networks in terms of EE when effective SI mitigation techniques are applied.

scholarly journals Throughput Performance of A Delay Constraint Transmission For Half-Duplex And Full-Duplex Cognitive Relay Networks

2021 ◽  
Author(s):  
Binod Prasad ◽  
Gopal Chandra Das ◽  
Srinivas Nallagonda ◽  
Seemanti Saha ◽  
Abhijit Bhowmick
Keyword(s):  
Network Performance ◽  
Relay Node ◽  
Time Parameter ◽  
Full Duplex ◽  
System Throughput ◽  
Delay Constraint ◽  
Decode And Forward ◽  
Half Duplex ◽  
Rf Signal ◽  
The Impact

Abstract The performance of a relay based Half-Duplex (HD) and Full-Duplex (FD) cooperative cognitive radio (CR) network with a RF energy harvesting (EH) is studied in this paper. Co-operative environment includes a network with multiple primary users (PUs), and CRs. The relay node is considered as an EH node which harvests energy (HE) from RF signal (RFS) of source and loop-back interference. The network performance is studied for instantaneous transmission and delay constraint transmission for decode and forward (DF) relaying protocol. The performance is investigated under a relay energy outage constraint and the expression of throughput is redesigned. Expressions of energy outage, data outage and throughput for HD and FD are developed. The impact of several parameters such as transmitting SNR, fractional harvesting time parameter, fractional transmission time parameter, and loop-back interference on the system throughput has been investigated.

scholarly journals HD/FD and DF/AF with Fixed-Gain or Variable-Gain Protocol Switching Mechanism over Cooperative NOMA for Green-Wireless Networks

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1845 ◽  
Author(s):  
Thanh-Nam Tran ◽  
Miroslav Voznak
Keyword(s):  
Wireless Networks ◽  
Full Duplex ◽  
System Throughput ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Variable Gain ◽  
Switching Mechanism ◽  
Half Duplex ◽  
Protocol Switching

This article studied the application of multiple protocol switching mechanism (PSM) over cooperating Non-Orthogonal Multiple Access (NOMA) networks to minimize the probability of outage and maximize the system throughput and energy efficiency (EE). This study investigated six scenarios: (1) a cooperative NOMA system with half-duplex (HD) and decode-and-forward (DF) protocols at the relay; (2) a cooperative NOMA system with full-duplex (FD) and DF protocols at the relay; (3) a cooperative NOMA system with HD and amplification amplify-and-forward (AF) with fixed-gain (FG) protocols at the relay; (4) a cooperative NOMA system with HD and amplification AF with variable-gain (VG) protocols at the relay; (5) a cooperative NOMA system with FD and amplification AF with FG protocols at the relay; (6) a cooperative NOMA system with FD and amplification AF with VG protocols at the relay. Based on the results of analysis and simulations, the study determined the transmission scenario for best system performance. This paper also proposed a mechanism to switch between HD/FD and DF/AF with FG/VG protocols in order to improve the quality of service (QoS) for users with a weak conditional channel. This mechanism can be deployed in future 5G wireless network sensors. Finally, EE was also assessed in relation to future green-wireless networks (G-WNs).

scholarly journals Full-Duplex MAC Protocol for CSMA/CA-Based Single-Hop Wireless Networks

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2413 ◽  
Author(s):  
Yu Song ◽  
Wangdong Qi ◽  
Weiwei Zhao ◽  
Wenchi Cheng
Keyword(s):  
Mac Protocol ◽  
Transmission Probability ◽  
Full Duplex ◽  
System Throughput ◽  
Media Access Control ◽  
Media Access ◽  
Half Duplex ◽  
Long Time ◽  
The Media ◽  
The One

Full-duplex (FD) communication provides new opportunities for improving the throughputs of networks. However, this condition means that the number of senders increases from one to two within a certain range. We have to arrange the two nodes to send frames simultaneously in the media access control (MAC) layer. For the single-hop network model, using the FD features of the nodes and the cut-through mechanism, we propose an FD MAC protocol. The protocol improves the throughput of the network from the following two aspects. On the one hand, during the transmission of each node, based on the information of the received frame’s header, the protocol can detect collisions in the network, preventing the channel from being ineffectively occupied for a long time. On the other hand, the protocol can provide the FD with as many opportunities as possible for the nodes. According to the working process of the protocol, we modeled the states (“active” and “passive” transmission, back-off) of each node and their transitions to a Markov chain. We solved the “active” transmission probability of the node and further modeled the analytical performance of the protocol. The simulation results showed that the system throughput produced by our protocol was at least twice that of the conventional CSMA/CA protocol used in the half-duplex networks.

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