Lower bounds on the estimation performance in low complexity quantize-and-forward cooperative systems
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| Titel: | Lower bounds on the estimation performance in low complexity quantize-and-forward cooperative systems |
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| Autoren: | Avram, Iancu, Aerts, Nico, Moeneclaey, Marc |
| Quelle: | EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING ; ISSN: 1687-1499 |
| Verlagsinformationen: | SPRINGER INTERNATIONAL PUBLISHING AG |
| Publikationsjahr: | 2015 |
| Bestand: | Ghent University Academic Bibliography |
| Schlagwörter: | Cramer-Rao bound, Cooperative communication, Modified Cramer-Rao bound, 2-WAY RELAY NETWORKS, CHANNEL ESTIMATION, Estimation, WIRELESS NETWORKS, DIVERSITY, CAPACITY |
| Beschreibung: | Cooperative communication can effectively mitigate the effects of multipath propagation fading by using relay channels to provide spatial diversity. A relaying scheme suitable for half-duplex devices is the quantize-and-forward (QF) protocol, in which the information received from the source is quantized at the relay before being forwarded to the destination. In this contribution, the Cramer-Rao bound (CRB) is obtained for the case where all channel parameters in a QF system are estimated at the destination. The CRB is a lower bound (LB) on the mean square estimation error (MSEE) of an unbiased estimate and can thus be used to benchmark practical estimation algorithms. Additionally, the modified Cramer-Rao bound (MCRB) is also presented, which is a looser but computationally less complex bound. An importance sampling technique is developed to speed up the computation of the MCRBs, and the MSEE performance of a practical estimation algorithm is compared with the (M)CRBs. We point out that the parameters of the source-destination and relay-destination channels can be accurately estimated but that inevitably the source-relay channel estimate is poor when the instantaneous SNR on the relay-destination channel is low; however, in this case, the decoder performance is not affected by the inaccurate source-relay channel estimate. |
| Publikationsart: | article in journal/newspaper |
| Dateibeschreibung: | application/pdf |
| Sprache: | English |
| Relation: | https://biblio.ugent.be/publication/7007149; https://biblio.ugent.be/publication/7007149/file/7007159 |
| DOI: | 10.1186/s13638-015-0461-8 |
| Verfügbarkeit: | https://biblio.ugent.be/publication/7007149 http://hdl.handle.net/1854/LU-7007149 https://doi.org/10.1186/s13638-015-0461-8 https://biblio.ugent.be/publication/7007149/file/7007159 |
| Rights: | No license (in copyright) ; info:eu-repo/semantics/openAccess |
| Dokumentencode: | edsbas.14644180 |
| Datenbank: | BASE |
Nájsť tento článok vo Web of Science | Abstract: | Cooperative communication can effectively mitigate the effects of multipath propagation fading by using relay channels to provide spatial diversity. A relaying scheme suitable for half-duplex devices is the quantize-and-forward (QF) protocol, in which the information received from the source is quantized at the relay before being forwarded to the destination. In this contribution, the Cramer-Rao bound (CRB) is obtained for the case where all channel parameters in a QF system are estimated at the destination. The CRB is a lower bound (LB) on the mean square estimation error (MSEE) of an unbiased estimate and can thus be used to benchmark practical estimation algorithms. Additionally, the modified Cramer-Rao bound (MCRB) is also presented, which is a looser but computationally less complex bound. An importance sampling technique is developed to speed up the computation of the MCRBs, and the MSEE performance of a practical estimation algorithm is compared with the (M)CRBs. We point out that the parameters of the source-destination and relay-destination channels can be accurately estimated but that inevitably the source-relay channel estimate is poor when the instantaneous SNR on the relay-destination channel is low; however, in this case, the decoder performance is not affected by the inaccurate source-relay channel estimate. |
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| DOI: | 10.1186/s13638-015-0461-8 |