Energy-Efficient Cooperative Relaying over Fading Channels with Simple Relay Selection
Abstract
We consider a cooperative wireless network where a set of nodes cooperate to relay in parallel the information from a source to a destination using a decode-and-forward approach. The source broadcasts the data to the relays, some or all of which cooperatively beamform to forward the data to the destination. We generalize the standard approaches for cooperative communications in two key respects: (i) we explicitly model and factor in the cost of acquiring channel state information (CSI), and (ii) we consider more general selection rules for the relays and compute the optimal one among them. In particular, we consider simple relay selection and outage criteria that exploit the inherent diversity of relay networks and satisfy a mandated outage constraint. These criteria include as special cases several relay selection criteria proposed in the literature. We obtain expressions for the total energy consumption for general relay selection and outage criteria for the non-homogeneous case, in which different relay links have different mean channel power gains, and the homogeneous case, in which the relay links statistics are identical. We characterize the structure of the optimal transmission scheme. Numerical results show that the cost of training and feedback of CSI is significant. The optimal strategy is to use a varying subset (and number) of relay nodes to cooperatively beamform at any given time. Depending on the relative location of the relays, the source, and the destination, numerical computations show energy savings of about 16% when an optimal relay selection rule is used. We also study the impact of shadowing correlation on the energy consumption for a cooperative relay network.
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Cooperative relay communications and network densification help reduce the transmit power of mobile devices by reducing the per-hop signal propagation distance.
“Cooperative relay communications and network densification would also help to reduce the transmit power of mobile device by reducing the per-hop signal propagation distance [64], [65].”
From What should 6G be? (2020) · cites this paper as [64]
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- Authors
- Madan, R., Mehta, N., Molisch, A., & Zhang, J.
- Affiliations
- Indian Institute of Science Bangalore (IN)
- Lund University (SE)
- Mitsubishi Electric Research Laboratories (United States) (US)
- Venue
- IEEE Transactions on Wireless Communications
- Published
- 2008-08
- Volume
- 7
- Issue
- 8
- Pages
- 3013-3025
- ISSN
- 1536-1276 (ISSN-L)
- OpenAlex
- W2099837771
- Cited by
- 380
- References
- 33
- Citations by year
- 2025: 2 · 2023: 3 · 2022: 2 · 2021: 3 · 2020: 3 · 2019: 9 · 2018: 12 · 2017: 19 · 2016: 28 · 2015: 24 · 2014: 28 · 2013: 55 · 2012: 55
- FWCI
- 71.70
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- IEEE Transactions on Wireless Communications (publishedVersion)
- NOT FOUND REPOSITORY (Indian Institute of Science Bangalore) (acceptedVersion)
- Lund University Publications (Lund University) (submittedVersion)
- Topics
- Physical Sciences › Computer Science › Computer Networks and Communications › Cooperative Communication and Network Coding
- Physical Sciences › Computer Science › Computer Networks and Communications › Mobile Ad Hoc Networks
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Optical Wireless Communication Technologies
- Keywords
- cooperative relaying, energy efficiency, relay selection, decode-and-forward relaying, cooperative beamforming, fading channels, channel state information acquisition, outage probability, outage probability constraint
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