EnergyEfficient Cooperative Relaying over Fading Channels with Simple Relay Selection
(2008) In IEEE Transactions on Wireless Communications 7(8). p.30133025 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 decodeandforward 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... (More)
 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 decodeandforward 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 nonhomogeneous 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. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/5336037
 author
 Madan, R.; Mehta, N.B.; Molisch, Andreas ^{LU} and Zhang, Jin
 organization
 publishing date
 2008
 type
 Contribution to journal
 publication status
 published
 subject
 in
 IEEE Transactions on Wireless Communications
 volume
 7
 issue
 8
 pages
 3013  3025
 publisher
 IEEEInstitute of Electrical and Electronics Engineers Inc.
 external identifiers

 scopus:50049094366
 ISSN
 15361276
 DOI
 10.1109/TWC.2008.06090
 language
 English
 LU publication?
 yes
 id
 0ac45314d9194f3e9d73d8d4201969b6 (old id 5336037)
 date added to LUP
 20150427 13:21:50
 date last changed
 20170409 04:33:31
@article{0ac45314d9194f3e9d73d8d4201969b6, 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 decodeandforward 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 nonhomogeneous 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.}, author = {Madan, R. and Mehta, N.B. and Molisch, Andreas and Zhang, Jin}, issn = {15361276}, language = {eng}, number = {8}, pages = {30133025}, publisher = {IEEEInstitute of Electrical and Electronics Engineers Inc.}, series = {IEEE Transactions on Wireless Communications}, title = {EnergyEfficient Cooperative Relaying over Fading Channels with Simple Relay Selection}, url = {http://dx.doi.org/10.1109/TWC.2008.06090}, volume = {7}, year = {2008}, }