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In this paper, we investigate the performance of a generic relay system for small cells. The main features include the selection decode-and-forward (DF) scheme, Rician and Rayleigh fading, single or repeated transmissions in direct link, and maximal-ratio combining at destination. We are able to derive a set of closed-form expressions for the end-to-end performance. Based on these formulas, we define...
In this paper, we investigate the performance of a three-link relay system in the scope of radio access networks. The diversity decode-and-forward (DDF) mode and repetition coding are adopted due to the robustness and low complexity for small devices. On the other hand, signal transmissions are subject to mixed fading. The backhaul link is under the Rician fading, while the access link and direct...
In order to achieve more efficient communication performances in vehicular ad hoc network (VANET) for road safety related message propagation, we propose a special nonbinary network coding scheme to improve the system reliability by reducing the outage probability of the communication system. Suppose all users in the network are provided with multiple antennas, which are responsible for message transmitting,...
In the future millimeter-wave small-cell communication systems, relay cooperation is deemed as one of the promising techniques to realize green communication. In relay cooperative system, the selected relaying mode determines the system performance in some extent. For the commonly used modes, amplify-and-forward (AF) and decode-and-forward (DF), which one should be taken in specific scenario? In this...
We characterised the physical layer security of a three terminal cooperative network with full-duplex relaying under Nakagami-m channel analytically and through simulation. An eavesdropper also coexists within the system at an arbitrary distance from the transmitter. Using secrecy outage probability as a metric to characterise the secrecy performance, integral expression for the corresponding outage...
Physical layer security has attracted tremendous attention in recent years. This paper proposes a novel transmit antenna selection and cooperative communication design to enhance physical layer security. The proposed scheme is brought up in order to take full advantage of macro diversity, so that security performance can be enhanced to some extent. Specifically, we consider the scenario which contains...
This paper analyzes the outage probability, energy efficiency, energy efficiency-spectral efficiency trade-off, through-put performance, energy efficiency-throughput gain trade-off and derives the optimal transmission power of Single-hop, Multi-hop, Decode-and-Forward (DF) and Incremental Decode-and-Forward (IDF) schemes in order to find out what extent collaborative communication can save energy...
In this paper, ergodic secrecy capacity is analyzed in a cooperative communication network, for an independent but non-identically distributed (i.n.i.d) Rayleigh fading channel. By using multi-trusted decode and forward relays, the model assumes direct links between a sender (Alice) and receiver nodes (Bob and an eavesdropper); in addition both Alice and the relay have perfect knowledge about the...
In this paper, secrecy outage probability is analyzed in a cooperative network for an independent but non-identically distributed (i.n.i.d) Rayleigh fading channel. By using multi-trusted decode and forward relays, the model assumes direct links between a sender (Alice) and receiver nodes (Bob and an eavesdropper). The protocol employed herein selects the best relay with the highest signal-to-noise...
The Bit Error Rate(BER) performance of Multi-Branch Multi-Hop (MB-MH) system with Kth best relay choice scheme in AF networks is presented. We excogitated a scheme in cooperative communication networks i.e. a MB-MH system with Kth best relay selection, in order to vanquish the hurdles whenever the best exasperates. Considering all the Rayleigh Fading Channels which are mutually identical and independently...
In this paper, we consider an amplify-and-forward (AF) transmission based multi-hop cooperative relay network operating over generalized-K fading channels. The generalized-K fading channel is general enough to incorporate most of the composite multi-path fading and shadowing channels which are widely encountered in real-world environments. In this paper, novel closed-form expressions for the average...
In this paper, we intend to improve the performance of IR-UWB system by cooperative dual-hop scheme and the BER of the two-hop DS-BPAM UWB system over indoor multipath fading channels is studied. We employ non-regenerative relaying scheme in the relay node instead of regenerative relaying to avoid the performance degradation. To study the system performance, the end to end SINR analysis of the dual-hop...
Tight bounds for the mean achievable rates of amplify-and-forward cooperative relay networks are derived for three distinct source adaptive transmission policies in a myriad of fading environments: (i) constant power with optimal rate adaptation (ORA); (ii) optimal joint power and rate adaptation (OPRA); and (iii) fixed rate with truncated channel inversion (TCIFR). Our unified framework based on...
Multicast service is a key function of the next generation broadband mobile system. The performance of wireless multicasting is severely degraded due to the wireless channel fading. Multiple antennas and cooperative communication are promising techniques that can be used to improve the multicast performance. Most cooperative schemes are based on the decode-and-forward (DF) strategy that requires the...
In this paper, we investigate the optimal power allocation scheme for relay networks with finite-alphabet constraints. It has been shown that the previous work utilizing various design criteria with the Gaussian inputs assumption may lead to significant loss for a practical system with finite constellation set constraint, especially when signal-to-noise ratio (SNR) is in medium-to-high regions, or...
In this paper, we investigate the performance of selection cooperation in the presence of imperfect channel estimation. In particular, we consider a cooperative scenario with multiple relays and amplify-and-forward protocol over frequency flat fading channels. In the selection scheme, only the "best" relay which maximizes the effective signal-to-noise ratio (SNR) at the receiver end is selected...
This paper evaluates the performance of a decode-and-forward scheme using orthogonal frequency-division multiplexing (OFDM) over both time-selective and frequency-selective fading channels. We consider a simple detection based on the zero-forcing (ZF) principle to eliminate inter-carrier interference (ICI) caused by high mobility and to combine signals received from the source and the relay for high...
In this paper, we consider the multiple base station cooperative transmission, a new technology being developed to lift the interference limits on wireless network. In practice, the biggest challenge facing multiple base station collaboration is the stringent requirement of the high-speed backbone to enable information exchange, especially for large deployment. We address this backbone issue and propose...
This paper studies a network coding scheme that exploits a cooperative diversity and adaptation to variant link states for reliable networks. We propose a scheme, adaptive rate network coding (ARNC), to change the number of transmission in relay nodes according to channel states over fading channels by matching network graphs with rateless code graphs, raptor codes. In ARNC scheme, a relay transmits...
In this paper, we express the Cramer-Rao Bound (CRB) for channel coefficient and noise variance estimation at the destination of an Amplify-and- Forward (AF) based cooperative system, in terms of the a posteriori expectation of the codewords. An algorithm based on factor graphs can be applied in order to calculate this expectation. As the computation of the CRB is rather intensive, the modified CRB...
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