Digitale Kommunikationssysteme


Relay, Multi-Hop, Multi-Way


Beschreibung

Relay

Cooperative communication and relaying are among the important research topics in wireless network information theory. The basic model to study this problem is the 3-node relay channel in which there is a signal transmitter, a relay over which the signal is transmitted and a signal receiver. The purpose of the relay is to support the exchange of information between the transmitter and its intended receiver. The relay is of particular interest in a multi-user setting where there are multiple pairs of corresponding transmitters and receivers. Taking interference, noise and decoding of the signal into account particularly makes relaying a topic of interest as an optimal relaying strategy still remains unknown.

Multi-Hop

In cellular networks, communication occurs between a base station and nodes within a cell. A challenge for system designers is to achieve Quality of Services (Q.O.S) for all users, especially those near the cell-edge in urban areas. Promising solutions to this challenge are multi-hop strategies. In multi-hop wireless networks, one or more intermediate nodes are placed along the path between the base station and the receiver. These intermediate nodes serve the purpose of wirelessly receiving and forwarding the packets of information between the base station and the receiver – exactly the same principle as that of an athletic relay race where the baton that is passed from one athlete to the next can be imagined as the packet of information and the athletes as the intermediate nodes. The advantages of multi-hop networks as opposed to networks with single wireless links are that multi-hop networks can extend the coverage of a network over a large area, can improve network connectivity and can be deployed in a cost-effective way. However, multi-hop network methods are still an open research problem, therefore research is still being carried out to tackle questions such as how to optimally forward the information.

Multi-way

A large share of communication activity is multi-way, where information flows between all parties involved in the communication. An example of multi-way communications is video conferencing. In this example, users exchange information in multiple directions simultaneously. This mode of communication has been studied early since 1961 by Shannon in his two-way channel, and continued as an important field of research till nowadays. With the increase in communications activity, the demand for efficient communication schemes also increased. This made multi-way communications a hot research topic recently, due to the ability of schemes exploiting this mode of communication to boost the spectral efficiency of communication. One instance of such schemes is network coding, which is the main scheme in multi-way communications scenarios, and thus, is being studied extensively by researchers nowadays. The main challenge in multi-way communications lies in the competing roles that a node nust play: transmission, relaying, and feedback. These aspects make multi-way communications an interesting topic for investigation.


Relevante Arbeiten

  • C. Shannon, Two-way communication channels, Proc. of Fourth Berkeley Symposium on Mathematics, Statistics, and Probability, vol. 1, pp. 611-644, 1961.
  • T. M. Cover, A. El-Gamal, Capacity theorems for the relay channel, IEEE Trans. on Info. Theory, IT-25, no. 5, pp. 572-584, 1979.
  • O. Sahin, E. Erkip, Achievable rates for the Gaussian interference relay channel, Proc. of GLOBECOM, Washington D.C., Nov. 2007.
  • V. R. Cadambe, S. A. Jafar, Degrees of freedom of wireless networks with relays, feedback, cooperation and full duplex operation, IEEE Trans. on Info. Theory, vol. 55, no. 5, pp. 2334-2344, 2009.
  • S. Rini, D. Tuninetti, N. Devroye, Outer bounds for the interference channel with a cognitive relay, Proc. of ITW, Dublin, Sep. 2010.
  • Y. Tian, A. Yener, The Gaussian interference relay channel: improved achievable rates and sum rate upper bounds using a potent relay, IEEE Trans. on Info. Theory, vol. 57, no. 5,  pp. 2865-2879, 2011.
  • I. Marić, R. Dabora, A. J. Goldsmith, Relaying in the Presence of Interference: Achievable Rates, Interference Forwarding, and Outer Bounds, IEEE Trans. on Info. Theory, vol. 58, no. 7, pp. 4342-4354, 2012.

Our contributions


Author / Editor / Organization Titel Year Download / Bibtex
2017
1 A. Kariminezhad , Amr Elbassiouni , A. Sezgin Pareto Boundary for Massive-MIMO-Relay-Assisted Interference Networks: Half-duplex vs. Full-duplex Processing Download
BibTeX
2 J. Kakar , S. Gherekhloo , A. Sezgin Fundamental Limits on Latency in Transceiver Cache-Aided HetNets Link
BibTeX
2016
1 S. Gherekhloo , A. Chaaban , A. Sezgin Cooperation for interference management: A GDoF perspective Link
BibTeX
2 D. Michaelis , A. Sezgin , Eduard Jorswieck On the Capacity of an Elemental Two-Way Two-Tier Network Link
BibTeX
2015
1 A. Chaaban , A. Sezgin Cyclic Communication and the Inseparability of MIMO Multi-way Relay Channels BibTeX
2 S. Gherekhloo , A. Sezgin Optimality of Treating Interference As Noise in the IRC: A GDOF Perspective BibTeX
3 A. Chaaban , Henning Maier , A. Sezgin , Rudolf Mathar Three-Way Channels with Multiple Unicast Sessions: Capacity Approximation via Network Transformation BibTeX
4 A. Chaaban , A. Sezgin Device-Relaying in Cellular D2D Networks: A Fairness Perspective Link
BibTeX
5 A. Chaaban , A. Sezgin On Channel Inseparability and the DoF Region of MIMO Multi-way Relay Channels BibTeX
6 A. Chaaban , A. Sezgin The Approximate Capacity Region of the Gaussian Y-Channel via the Deterministic Approach Link
BibTeX
2014
1 H. Maier , A. Chaaban , R. Mathar Symmetric Degrees of Freedom of the MIMO 3-Way Channel with MTxMR Antennas BibTeX
2 H. Maier , A. Chaaban , R. Mathar Degrees of Freedom of the MIMO 3-Way Channel BibTeX
3 H. Maier , A. Chaaban , R. Mathar , A. Sezgin Capacity Region of the Reciprocal Deterministic 3-Way Channel via Delta-Y Transformation BibTeX
4 A. Chaaban , Henning Maier , A. Sezgin The Degrees-of-Freedom of Multi-way Device-to-Device Communications is Limited by 2 BibTeX
5 A. Chaaban , K. Ochs , A. Sezgin Simultaneous Diagonalization: On the DoF Region of the K-user MIMO Multi-way Relay Channel BibTeX
2013
1 S. Gherekhloo , A. Chaaban , A. Sezgin The generalized degrees of freedom of the interference relay channel with strong interference. Download
Link
BibTeX
2 A. Chaaban , A. Sezgin , A. S. Avestimehr Approximate Sum Capacity of the Y-Channel Link
BibTeX
3 A. Chaaban Relaying for Interference Management
4 A. Chaaban , K. Ochs , A. Sezgin The Degrees of Freedom of the MIMO Y-channel Link
BibTeX
5 A. Chaaban , A. Sezgin Relaying Strategies for the Interference Relay Channel BibTeX
6 A. Chaaban , S. Gherekhloo , A. Sezgin Relays for Interference Management: Feedback, Amplification and Neutralization BibTeX
7 A. Chaaban , A. Sezgin , D. Tuninetti Achieving Net Feedback Gain in the Linear-Deterministic Butterfly Network with a Full-Duplex Relay Link
BibTeX
2012
1 A. Chaaban , A. Sezgin , Daniela Tuninetti Cooperation Strategies for the Butterfly Network: Neutralization, Feedback, and Computation BibTeX
2 A. Chaaban , A. Sezgin On the Generalized Degrees of Freedom of the Gaussian Interference Relay Channel Download
BibTeX
3 A. Chaaban , A. Sezgin The DoF of the K-user Interference Channel with a Cognitive Relay BibTeX
4 A. Chaaban , A. Sezgin Signal Space Alignment for the Gaussian Y-Channel Download
BibTeX
5 A. Chaaban , A. Sezgin Lattice Coding and the Generalized Degrees of Freedom of the Interference Channel with Relay Download
BibTeX
2011
1 A. Chaaban , A. Sezgin , S. Avestimehr On the sum capacity of the Y-Channel Download
BibTeX
2 A. Sezgin , A. S. Avestimehr , M. Amin Khajehnejad , Babak Hassibi Divide-and-conquer: Approaching the capacity of the two-pair bidirectional Gaussian relay network Download
BibTeX
3 A. Chaaban , A. Sezgin The Capacity Region of the Linear Shift Deterministic Y-Channel Download
BibTeX
4 J. Li , A. Sezgin , M. Haardt Coordinated Beamforming for MIMO Interference Relay Channel with Multiple Stream Transmission BibTeX
2010
1 A. Chaaban , A. Sezgin Achievable Rates and Upper Bounds for the Interference Relay Channel BibTeX
2 A. Sezgin , H. Boche , S. Avestimehr Bidirectional multi-pair network with a MIMO relay: Beamforming strategies and lack of duality Download
BibTeX
3 Z. Utkovski , A. Sezgin , J. Lindner Non-Coherent Two-Way Relaying: Rate Bounds for the high SNR Regime BibTeX
4 A. S. Avestimehr , A. Sezgin , D. Tse Capacity of the two-way relay channel within a constant gap Link
BibTeX
5 A. Chaaban , A. Sezgin From non-causality to causality: degrees of freedom of the interference relay channel BibTeX
6 E. A. Joswieck , A. Sezgin Transmit Strategies for the MIMO two-way amplify-forward channel with multiple relays and MMSE receiver BibTeX
7 A. Chaaban , A. Sezgin Interference Channel with Delay : Noisy interference BibTeX
8 A. Chaaban , A. Sezgin On the transmit strategy for the interference MIMO relay channel in the low power regime Download
BibTeX
2009
1 A. Sezgin , A. Khajehnejad , S. Avestimehr , B. Hassibi Approximate capacity region of the two-pair bidirectional Gaussian relay network Download
BibTeX
2008
1 A. Sezgin , E. A. Jorswieck Cooperative Communications for Improved Wireless Network Transmission Link
2 A. S. Avestimehr , A. Sezgin , D. Tse Approximate capacity of the two-way relay channel: A deterministic approach Download
BibTeX
2004
1 A. Sezgin , T. J. Oechtering A new resource efficient transmission scheme for Cooperative Systems BibTeX