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We propose an underlay decode-and-forward cognitive (UDFC) scheme under joint effects of hardware impairments at secondary users and interference constraints at multi primary receivers. In this scheme, the transmit powers of a source node and relays are constrained by interference thresholds of primary receivers in which the best relay is selected has the highest decoding capacity from the source...
In this work, we implement and demonstrate differential amplify-and-forward (DAF) cooperative relaying as a novel diversity technique to combat bit errors and outages common in airborne environments. By using differential modulation and demodulation, we reduce the system complexity by avoiding channel estimation which is often unreliable or computationally costly in dynamic environments with mobile...
This paper considers the layered transmission between the source and the destination over two relays using super-position coding (SC). In this two-hop decode-and-forward (DF) relaying system, because of the network topology, the receiver continuously decodes only the base layer of the direct transmission from the source; the enhancement layer is decoded with a delay based on the transmission from...
Molecular communications (MC) is a promising paradigm which utilizes molecules to implement communication among nano-machines. Cooperative relaying strategies can be used to extend communication distance and achieve reliable remote communications. In this paper, a two-hop diffusion-based molecular communication with three nano-machine nodes is considered. To mitigate the drawback of traditional cooperative...
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...
We consider an inter-layer FEC technique combined with hierarchical 16QAM schemes for stereoscopic video transmission over AWGN relay channels. The proposed system with the suitable hierarchical value (α) can gain about 2.26–6.18 dB in the average PSNR performance, compared with the system using conventional FEC and hierarchical 16QAM schemes.
This paper proposes Raptor codes-structured wireless super-dense networks serving a massive number of users with passive nodes constructing a precode of Raptor codes for future wireless networks. Passive nodes do not have their own information and only forward information from the neighboring nodes to the destination node. Similar to the capability of precode of Raptor coding scheme to protect information...
In this paper, we consider a Joint Channel Network Coding (JCNC) scheme applied to Multiple Access Relay Channel (MARC) for correlated sources. Then, two correlated sources send their messages to one destination and one relay which performs network coding and provides additional information to the receiver. At the destination, a joint iterative decoding algorithm is developed which takes into account...
In this paper wireless communications network is considered to transmit source information to destination. N number sources transmitting data to a destination receiver, through M relays nodes by employing random linear network coding (RLNC). Two methods of failure decoding probability on performance of wireless communication are explained and discussed in this paper. The major parameter that will...
This paper considers the analysis of communication protocols in wireless networks implementing both cooperation and Hybrid Automatic Repeat reQuest (HARQ) for Type I decoder and Type II decoder with Chase Combining. Using an example of a three-node network, we show that the communication protocol can be modeled using Finite State Markov Chains. This model efficiently predicts the performance of the...
In this paper, we analyze differential binary modulation for decode-and-forward (DF) based cooperative free space optical (FSO) network utilizing piecewise linear (PL) approximation and Gamma-Gamma (GG) fading links. We adopt subcarrier intensity modulation (SIM) scheme and a single relay for transmitting the binary phase shift keying (BPSK) modulated data over the FSO channels. The PL decoder considers...
Graph-based random access protocols have emerged as an efficient solution to tackle the medium sharing problem for machine type communications. Their remarkable performance is well-understood for scenarios in which devices communicate with a one-hop receiver devoted to collecting packets. Many practical applications, however, foresee the receiver to also act as sender towards a second-hop terminal...
In this paper, we consider optimal transceiver design and relay selection for simultaneous transfer of data and energy in a cooperative network consisting of amplify-and-forward (AF) relays. In this context, we address two different problems and propose optimal relay selection and transceiver processing. Furthermore, the problems are formulated for both time switching (TS) and power splitting (PS)...
Interference forwarding by a relay enhances the interference level and enables the cancellation of the interference. If the interfering source to relay link is not strong, then the relay can decode a part of the interference and forward it to the destination, and the destination can cancel only that part of the interference. It is known as partial decode-and-forward (PDF) and partial interference...
A new time switching protocol referred to as TS- APS is proposed for the energy harvesting (EH) relay networks based on the combination of conventional time switching (TS) protocol and adaptive power splitting (APS). In the framework of the decode and forward (DF) relaying with multiple relays, we derive the closed-form expression for the outage probability of the proposed scheme and discuss its effective...
In this paper, we investigate the physical-layer network coding (PNC) scheme based on successive interference cancellation (SIC) in multi-way relay channels (MWRC). We consider a scenario where all users simultaneously transmit signals to the relay in the up-link stage while the relay broadcasts a coded message in the down-link stage. In order to extract the network codes from superimposed signals...
Device-to-device (D2D) communications in cellular networks enable direct transmissions between user equipments (UEs). If the source UE (SUE) and the destination UE (DUE) are far away from each other or the channel between them is too weak for direct transmission, then multi-hop D2D communications, where relay UEs (RUEs) forward the SUE's data packets to the DUE, can be used. In this paper, we propose...
Communication over channels with state is a classical problem extensively studied. Herein, the problem statement is extended to consider a multihop channel where the channel state information in hops, unavailable to neither the source, the destination, nor the relay(s), is to be estimated at the destination, along with reliable information transmission. Each relay in the multihop channel forwards...
We study the transmission over a network in which users send information to a remote destination through relay nodes that are connected to the destination via finite-capacity error-free links, i.e., a cloud radio access network. The relays are constrained to operate without knowledge of the users' codebooks, i.e., they perform oblivious processing. The destination, or central processor, however, is...
Previous approaches to compute-and-forward (C&F) are mostly based on quantizing channel coefficients to integers. In this work, we investigate the C&F strategy over block fading channels using Construction A over rings, so as to allow better quantization for the channels. Advantages in decoding error probabilities and computation rates are demonstrated, and the construction is shown to outperform...
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