Wireless Personal Communications

, Volume 74, Issue 1, pp 83–99 | Cite as

Capacity Maximization through Energy-Aware Multi-Mode Relaying

  • Nikolaos Nomikos
  • Dimitrios N. Skoutas
  • Demosthenes Vouyioukas
  • Christos Verikoukis
  • Charalabos Skianis


In future wireless mobile networks, data rate and quality of service are expected to be comparable to those of wired deployments. To achieve this target, novel architectures must be adopted, successfully countering the disadvantages of the wireless transmission. Inspired by that, cooperative relaying was proposed because of the various gains it introduces to the network. In this work we propose a scheme consisting of multi-mode decode and forward relays facilitating the communication between a base station and a user terminal (UT). By equipping the relays with two interfaces, we can exploit the plethora of the available wireless protocols. Also, instead of performing multi-relay transmissions, we adopt an opportunistic relaying scheme due to its simplicity and outage-optimality. Additionally, we incorporate successive transmissions to improve the spectral efficiency, thus recovering the half-duplex loss in capacity due to the two-hop transmission. However, as inter-relay interference arises from successive transmissions, we propose mitigation techniques through interference cancellation and out-band transmissions using the multi-mode relays. At the same time, an energy-aware mechanism is implemented in the selected relay’s transmission, opting for power reduction, as the channel state information is acquired prior to the signal’s forwarding to the UT. Finally, we give numerical results by comparing the proposed energy-aware multi-mode relaying (EA-MMR) scheme, with two other schemes in terms of average end-to-end capacity, outage probability, delay distribution and power gain.


Opportunistic relaying Successive relaying Multi mode relaying energy-aware relaying 


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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  • Nikolaos Nomikos
    • 1
  • Dimitrios N. Skoutas
    • 1
  • Demosthenes Vouyioukas
    • 1
  • Christos Verikoukis
    • 2
  • Charalabos Skianis
    • 1
  1. 1.Department of Information and Communication Systems EngineeringUniversity of the AegeanSamosGreece
  2. 2.Telecommunications Technological Centre of Catalonia (CTTC)CastelldefelsSpain

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