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Research Group Communications Engineering - Project Description

Mutual Information based ARQ- Concepts in Relay Networks

Relay networks have received much attention in the research community during the last 10 years. In combination with Automatic Repeat reQuest (ARQ) concepts adaptive relay protocols are established. Conventional ARQ schemes only acknowledge a successful or unsuccessful reception of a packet, i.e. they feedback 1 bit to the transmitter. If additional information like the link SNR or the missing mutual information for successful decoding are fed back as well, substantial improvements can be achieved.

In this project, the received mutual information shall be fed back in order to adapt the transmission to current channel conditions. The goal is to develop strategies to minimize the resource consumption while providing exactly as much information as necessary for a successful decoding at the destination. The resulting optimization problem has to be solved for simple repetition coding at the relay as well as for incremental redundancy.


German National Science Foundation (DFG), 2010 - 2013


1. Khan, A.; Kühn, V.:
Performance Comparison of different Protocols for a Two-hop Multiple Relay Network. International ITG Workshop on Smart Antennas (WSA'12), pp. 20-27, Dresden, Germany, 2012
2. Khan, A.; Kühn, V.:
Analysis of Power Optimization in a 2-hop Multiple Relay Network. International ITG Workshop on Smart Antennas (WSA'12), pp. 230-237, Dresden, Germany, 2012
3. Khan, A.; Kühn, V.:
Rate Optimization for Incremental Redundancy and Repetition Coding in Relay Networks. Proceedings of the 19th European Signal Processing Conference (EUSIPCO-2010), Barcelona, Spain, 2011
4. Khan, A.; Kühn, V.:
Power Optimization in Adaptive Relay Networks. Proc. IEEE Global Communications Conference (GLOBECOM 2010), Miami, USA, 2010
5. Khan, A.; Kühn, V.:
Power Versus Relay Selection in Adaptive Relay Networks. 7th International Symposium on Wireless Communication Systems (ISWCS'10), York, UK, 2010
6. Khan, A.; Kühn, V.:
Optimizing ARQ Strategies in Relay Networks. 8th Intl. Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt'10, WNC3), Avignon, France, 2010
7. Khan, A.; Kühn, V.:
On the Performance of Adaptive Relaying with ARQ. International ITG Workshop on Smart Antennas 2010, Bremen, Germany, 2010
8. Khan, A.; Kühn, V.:
Mutual Information Based Resource Allocation in Relay Networks. Proc. 8th ITG Conference on Source and Channel Coding (SCC'10), Siegen, Germany, 2010
9. Khan, A.; Kühn, V.; Vorköper, S.:
Information Combining Based ARQ in Relay Networks. 15th European Wireless Conference (EW 2009), Aalborg, Denmark, 2009


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Prof. Dr.-Ing. habil. Volker Kühn

Phone:   0381 / 498-7330
Fax:   0381 / 498-7302
Room:   W: 8.233
E-Mail:   volker.kuehn(at)

Institut für Nachrichtentechnik
R.-Wagner-Str. 31 (Haus 8)
18119 Rostock/Warnemünde

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