Figure 3 - uploaded by Tho Le-Ngoc
Content may be subject to copyright.
Source publication
We propose coded cooperative relaying schemes in which all successfully decoded signals from multiple sources are forwarded simultaneously by a multiantenna relay to a common multiantenna destination to increase bandwidth efficiency. These schemes facilitate various retransmission strategies at relay and single-user and multiuser iterative decoding...
Contexts in source publication
Context 1
... parallel transmission (PT), the N (≤T) successfully recovered information segments, I t , t ∈ {1, . . . , T} are pro- cessed separately and retransmitted on different antennas as shown in Figure 3. The relay randomly chooses N among T transmit antennas (e.g., the first N out of T antennas as in the simulations). ...
Context 2
... addition, the performance gap between the proposed scheme and that in [9] is dramatically increased with the improvement of the source-relay channels and the relay-destination channels (by comparing Figures 7 and 12). Figure 13 indicates the BER performance of the 6 pro- posed schemes for different iterations where SNR in = SNR + 10 dB and SNR rd = SNR + 5 dB. We see that all the proposed schemes converge after 3 iterations. ...
Similar publications
Although there have been many interesting works on outage performance analysis of cognitive AF relay networks, we have not found works taking into consideration all the following issues: multiple primary users (PUs), the existence of the direct link from secondary user (SU) source to SU destination, non-identical, independent Rayleigh-fading channe...
Dans cet article nous nous intéressons à la détermination de débits de communication de Shannon pour le canal à interférence à relais (CIR). Ce modèle représente une brique de base d'un système dans lequel des utilisateurs doivent coexister sur la même bande de fréquence et peuvent également exploiter un noeud relais disponible afin d'accroître leu...
Citations
... In the relays receive signals from sources in one phase and basically amplify or demodulate source signals before forwarding processed signals to the destination in another phase. The destination is able to use maximum ratio combining in both phases to get well the original information [15]. OFDM based cooperative relaying both regenerative and non-regenerative, is a capable approach for further rising the capability and range. ...
New generation wireless communication systems require high data rate transmission in order to fulfill the requirements for on-demand multimedia communication like- audio, video, image and data. The integrating of orthogonal frequency division multiplexing (OFDM) and cooperative communication is to fulfill that demand. Cooperative communication is a novel technique which is effective to alleviate the effects of channel fading exploiting diversity gain achieved by cooperation nodes and relays. OFDM converts a frequency selective fading channel into a collection of parallel flat fading sub channels, but sensitive to frequency offset and phase noise. The carrier frequency offset and phase noise cause loss of orthogonality among subcarriers resulting to inter carrier interference.
Our motivation behind this book is to present the performance of OFDM based
cooperative communication system incorporating frequency offset and phase noise for the amplify and forward (AF) and decode and forward (DF) over Nakagami-m fading channel.
The purpose of this book is to provide the basic concepts of OFDM based AF and DF relay
cooperative communication combing frequency offset and phase noise over Nakagami-m fading channel. Detailed mathematical derivation is carried out for signal to noise plus interference ratio (SNIR) and average bit error rate (BER) for proposed scheme. The performance of the proposed systems is evaluated through numerical simulation by varying different system parameters in MATLAB. MATLAB software is used to solve the complex equations and expressions which are very tedious or practically impossible to evaluate manually. Numerical results are provided to show the significant improvement of DF in OFDM based cooperative communication due to same frequency offset and phase noise.
... La technologie multi-antennes au niveau des noeuds relais et des noeuds destinataires a été considérée dans [19,20,21]. Dans [19], pour tout trafic, le système étudié comporte cinq noeuds : deux noeuds sources, deux noeuds relais et un seul noeud destination. ...
... Les deux techniques appliquées de combinaison sont maximal ratio combining (MRC) et selection combining (SC). Dans [21], les auteurs ont considéré un système de communication coopérative avec des noeuds sources multiples, un noeud relais et un noeud destination. Chacun des noeuds relais et destination est équipé d'antennes multiples tandis que le noeud source est équipé d'une seule antenne. ...
Diversity provides an efficient method for combating multipath fading in mobile radio systems. One of the most common forms of spatial diversity is multiple-input multipleoutput (MIMO), where full diversity is obtained. However, embedding multiple antennas at the transmitter or the receiver can sometimes be expensive. As an alternative to collocated antennas, cooperative diversity in wireless multi-hop networks confirms their ability to achieve spatial diversity gains by exploiting the spatial diversity of the traditional MIMO techniques, without each node necessarily having multiple antennas. In addition, cooperative diversity has been shown to provide the network with importantthroughput, reduced energy requirements and improved access coverage.In light of this, the objective of this thesis is to devise coding schemes suitable for relay channels that aim at showing the best compromise between performance of diversity and coding gains. Firstly, we investigate a distributed turbo coding scheme dedicated to L-relay channels operating in the soft-decode-and-forward mode. Then, we present a proposed distributed turbo coded cooperative (DTCC) scheme, called parallel concatenated convolutional-based distributed coded cooperation. Finally, we investigate antenna/soft-relaying selection for DTCC networks in order to improve their end-to-end performance. Assuming BPSK transmission for fully interleaved channels with ideal channel state information, we define the explicit upper bounds for error probability inRayleigh fading channels with independent fading. Both theoretical limits and simulation results are presented to demonstrate the performances.
... They study the optimal relay location for CRT and SDR, and show that the flexibility of CRT can provide SNR gain over SDR. In [84] and [85] the same authors study another protocol similar to SDR and CRT. In this protocol, unlike ours, the relays transmit one by one, which provides higher reliability in the user-relay communication, but also increases the bandwidth expansion. ...
In this paper, the idea of Bit-Interleaved Coded Modulation has been applied to cooperative transmission among three UAVs which exchange important mission data for cooperative control. Both decode and Forward as well as Amplify and forward transmissions are considered and the results are also compared with direct transmission when the UAVs share information without sharing. The positional configurations include V-shaped flight, line and random. The channel model has been extended to general case, where the communicating terminals can have multiple antennas and there are multiple relays. Assuming perfect channel state information, it has been observed that amplify and forward outperform direct and decode and forward transmission in most scenarios.
We consider a coded cooperative relaying scheme in which two sources communicate with a destination with the assistance of a relay when necessary for improved bandwidth efficiency, reduced energy consumption and enhanced system performance. Based on the decoding status of source signals, the destination decides whether to ask the relay for help. Also, the relay can refuse the destination's request if it incorrectly decodes the source signals. Closed-form expressions for its bandwidth efficiency, total energy consumption, and outage probability are derived. Numerical results show the superiority of the proposed scheme to reference one for any SNR.
Coded cooperative MIMO relaying schemes in which all successfully decoded signals from multiple sources are simultaneously forwarded by a multi-antenna relay to a common multi-antenna destination to increase bandwidth efficiency are proposed in this paper. These schemes facilitate the various retransmission strategies at relay and single-user and multi-user iterative decoding techniques at destination, suitable for trade-offs between performance, latency, and complexity. When channel state information (CSI) is available, pre-coding and power allocation at the relay can be exploited to enhance the information transmission reliability over the relay-destination channel, thus improving the overall system performance. Simulation result shows their superiority to direct transmission under the same transmit power and bandwidth efficiency.
