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Polar codes has a better bit error rate (BER) performance than low-density parity-check (LDPC) and turbo codes with lower coding and decoding complexity. The polar-coded cooperation can provide significant enhancement of data rate and link reliability. However, simply binary coded cooperation cannot meet the requirements of spectral efficiency. In order to improve the spectral efficiency, this paper...
For a grid-connected AC microgrid (MG), when a fault occurs at the microgrid, adaptive overcurrent (OC) or directional overcurrent (DOC) relays must be activated as fast as possible to protect all distributed generation (DG) units and loads. Fault currents inside the grid-connected AC microgrid can be significantly varied because fault current contributions from the main grid and DG units are different...
The development of the self-interference cancellation techniques enables wireless nodes to work with the full duplex (FD) mode. In cooperative relay networks, however, FD relay (FDR) may not always outperform the half-duplex relay (HDR) due to the residual self-interference (RSI). On the other hand, the hybrid HD/FD relay strategy can adaptively facilitate the network performance. This paper investigates...
Cooperative communication is a promising technique, which can greatly improve the performance and extend the coverage of cellular networks. In this paper, the resource allocation problem is investigated for multi-carrier amplify-and-forward (AF) relay assisted multi-access networks with multiple users and subcarriers. The joint relay selection and subcarrier allocation problem is formulated as a combinatorial...
Cooperative MIMO communication is a promising technology which enables realistic solution for improving communication performance with MIMO technique in wireless networks that are composed of size and cost constrained devices. However, the security problems inherent to cooperative communication also arise. Cryptography can ensure the confidentiality in thecommunication and routing between authorized...
In this paper we study two-stage decode-and-forward coding schemes for relaying with multi-pair information exchange. A joint network and dirty-paper coding (JNDPC) scheme is proposed to serve as a basic element for coding in the broadcast stage. The JNDPC scheme embeds network coding into dirty-paper coding, which allows interference cancelation while fully utilizing the user side information. By...
This paper investigates the maximization of energy efficiency (EE) in decode-and-forward (DF) MIMO relaying systems with antenna selection. An iterative EE maximization algorithm is proposed to jointly select the active receive and transmit antennas at the relay, as well as optimize the transmission power of the source and relay. In particular, the antenna selection relies on a derived iterative property...
In this paper, we investigate the maximization of energy efficiency (EE) in amplify-and-forward (AF) MIMO relay systems combined with relay antenna selection. An iterative algorithm is proposed to jointly select the active receive and transmit antennas at the relay, as well as optimize the transmission power of the source and relay. Specifically, the antenna selection process is based on a derived...
This paper addresses the application of coalitional game theory to cooperative broadcast networks with simultaneous wireless information and power transfer (SWIPT). To improve the reception reliability of destinations with poor channel conditions, we first divide destinations in the network into two types. The first type, Type I, refers to the destinations with the capability of successful decoding...
In traditional, to manage a lot of solar panels in green power plants is very difficult and inefficient. Because one panel set needs a digital power meter, it is very expensive to use the panel to collect all data. To cope with this problem, we proposed a remote monitoring system of solar panels via IPv6 wireless network, in which the parameters of environment and panel voltage would be sent to the...
Molecular communication is the most promising approach for the communication in nanonetwork. However, the reliability of existing system degrades rapidly when the distance between transmitter and receiver increases. In this paper, we propose and evaluate a cooperative molecular communication solution that uses signal repeating to improve system reliability. The system has low complexity. Simulation...
The green communications, which focus on improving the energy efficiency, have attracted much attention from both academia and industry recently. In this paper, the tradeoff between outage probability and energy efficiency will be addressed for multi-flow cooperative communication systems with taking energy budget and devices energy consumption into consideration. The proposed approach will first...
In underwater acoustic networks, a transmission is done by means of acoustic wave. However, acoustic transmissions suffer long propagation delay and high bit error rate, especially for real time applications. Since speed of sound and underwater noises are varied with water depth, therefore, this paper takes sound speed and underwater noises into account and proposes a channel-aware depth-adaptive...
Owing to the capability of accumulating mutual information from the transmission of previous nodes, rateless codes can boost the network performance considerably, and hence have sparked much interest recently. However, how to efficiently schedule multi-hop multi-relay transmissions with the aid of rateless codes remains a challenging work. Particularly, it requires high complexity to find an optimal...
DF-AF selection MIMO relaying, where the relay equipped with multiple antennas can adaptively switch between decode-and-forward (DF) protocol and amplify-and-forward (AF) protocol according to its decoding state of the source message, is investigated in cooperative networks. We consider orthogonal space-time block coded transmission for a DF-AF selection MIMO relaying system in Rayleigh fading environment,...
Cooperative transmission in vehicular networks is studied by using coalitional game and pricing in this paper. There are several vehicles and roadside units (RSUs) in the networks. Each vehicle has a desire to transmit with a certain probability, which represents its data burtiness. The RSUs can enhance the vehicles' transmissions by cooperatively relaying the vehicles' data. We consider two kinds...
In this paper, we mainly focus on the problem about the channel capacity and power allocation of the downlink process of a wireless two-way relay channel which is time-varying while the relay node has a total awareness of the channel side information. For situations differing about how receiving nodes know about messages for the other, we accordingly determine the channel capacities and the coding...
In this paper, we consider the inter-relay interference (IRI) problem in a two-path successive amplify-and-forward (AF) multi-input multi-output (MIMO) relay system. First, a new interference cancellation algorithm employed at the relays is proposed to fully remove the IRI with an arbitrary number of antennas. Second, the transmit beamforming matrix at the source, relays and destination are jointly...
An opportunistic DF-AF selection relaying scheme with maximal received signal-to-noise ratio (SNR) at the destination is investigated in this paper. The outage probability of the opportunistic DF-AF selection relaying scheme over Nakagami-m fading channels is analyzed, and a closed-form solution is obtained. We perform asymptotic analysis of the outage probability in high SNR domain. The coding gain...
This paper presents the analysis of fault transient characteristics of microgrid equipped with renewable energy sources. The typical microgrid models have been developed and employed to simulate variety fault situations of microgrid system on PSCAD/EMTDC. Simulation results show that the initial transient fault current has been limited in small scale. The limited fault current increased slowly to...
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