Performance Comparisons of Relaying Schemes in Bi-directional Demodulate-and-Forward Channels

2012-04-04
ÖZDEMİR, ÖZGÜR
Yılmaz, Ali Özgür
Aktas, Emre
Bi-directional relaying (BDR) in which two users wish to exchange independent information in presence of a relay is one of the fundamental wireless network coding applications that attracted intense interests recently. In this paper, maximum likelihood (ML), cooperative maximal ratio combining (CMRC) and soft information relaying (SIR) schemes proposed to combat error propagation in wireless relay systems are applied to the BDR scenario with demodulate-and-forward protocol, which decreases system complexity and cost by removing the decoding process at the relay terminal. Simulation results for Rayleigh fading channels show that detection schemes using ML and CMRC techniques outperform the noncooperative system that involves direct transmissions between user terminals and overcome the diversity gain reduction due to error propagation for different levels of channel state information (CSI). In case of SIR based communication scenario, the diversity gain is contingent on the availability of a coefficient depending on instantaneous CSI.
IEEE Wireless Communications and Networking Conference (WCNC)

Suggestions

Differential network coding in wireless networks Telsiz aǧlarda farksal aǧ kodlamasi
Özdemir, Özgür; Yılmaz, Ali Özgür (2009-10-29)
In this paper a three-terminal communication scenario where two users exchange information by employing differential binary modulation and network coding via a relay is considered. The transmission is divided into three slots in time where the first and second slots are allocated to the transmission of differential encoded data of the users. After demodulation, the relay broadcasts the bit-wise XOR-ed and differential encoded packet to the users in the third slot. The optimum detector and a simplified decis...
Information-centric sensor networks for cognitive IoT: an overview
Al-Turjman, Fadi M. (2017-02-01)
Information-centric sensor networks (ICSNs) are a paradigm of wireless sensor networks that focus on delivering information from the network based on user requirements, rather than serving as a point-to-point data communication network. Introducing learning in such networks can help to dynamically identify good data delivery paths by correlating past actions and results, make intelligent adaptations to improve the network lifetime, and also improve the quality of information delivered by the network to the ...
Evaluation of priority dependent and time scheduled MAC layer protocols for ad-hoc networks
Erdeğer, İsmail; Baykal, Buyurman; Department of Electrical and Electronics Engineering (2015)
Ad-hoc networks have very unique features, such as dynamic topologies, relatively limited bandwidth and wireless signal propagation schemes, which present various challenges for wireless communication. In this thesis, control mechanisms for channel access scheduling and topology in ad-hoc networks are evaluated, which utilize the information from two-hop neighborhood to cope with the communication difficulties in ad-hoc networks. Channel assignment is one of the most important topics for ad-hoc networks. Ch...
Optimizing the Performance of Rule-Based Fuzzy Routing Algorithms in Wireless Sensor Networks
Sert, Seyyit Alper; Yazıcı, Adnan (2019-06-01)
Effective data routing is one of the crucial themes for energy-efficient communication in wireless sensor networks (WSN). In the WSN research domain, fuzzy approaches are in most cases superior to well-defined methodologies, especially where boundaries between clusters are unclear. For this reason, a significant number of studies have recently proposed fuzzy-based solutions for the problems encountered in WSNs. Rule-based fuzzy systems are part of these widespread fuzzy-based solutions that often involve so...
Performance Analysis of Beamforming Techniques in MU-MIMO Systems with Residual RF Impairments
Tamer, Ufuk; SUNU, CANSU; AKTAŞ, EMRE; Yılmaz, Ali Özgür (2015-05-19)
Multiple-input multiple-output wireless communication systems substantially suffer from RF Impairments in the course of the physical implementation of transceivers. In this paper, we study the performance of beamforming techniques in MU-MIMO (Multi-User MIMO) system with one transmitter and two receivers. We showed that the interference cancellation beamforming is suitable in the proposed scenario. In addition, we study the performance of MU-MIMO system with the suitable beamforming technique by taking RF i...
Citation Formats
Ö. ÖZDEMİR, A. Ö. Yılmaz, and E. Aktas, “Performance Comparisons of Relaying Schemes in Bi-directional Demodulate-and-Forward Channels,” presented at the IEEE Wireless Communications and Networking Conference (WCNC), Paris, FRANCE, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/55149.