On the Performance Gain of Hybrid Decode-Amplify-Forward Cooperative Communications
Blekinge Institute of Technology, School of Engineering, Department of Signal Processing2009 (English)In: EURASIP Journal on Wireless Communications and Networking, ISSN 1687-1472, E-ISSN 1687-1499, Vol. 2009Article in journal (Refereed) Published
In this paper, we investigate the performance of adaptive decode-forward (ADF), amplify-forward (AF), and hybrid decode-amplify-forward (HDAF) relaying protocol. In particular, we derive the closedform expression of symbol error probability (SEP) for these three relaying protocols. For the AF protocol, we derive a simpler and more tractable final result than previously published work . Furthermore, analyzing the high signal-to-noise ratio (SNR) regime, we derive an asymptotically tight approximation for SEP. Especially, for the AF protocol, our SEP approximation is tighter than the result in . The SEP approximation is used to assess an important aspect between the three different relaying protocols, i.e., the SEP performance gain of HADF over the two conventional relaying schemes ADF and AF. It is shown that the performance gain of HDAF over ADF and AF significantly depends on the relative value of channel conditions between source-to-relay and relay-to- estination link (relay channels). Interestingly, it is shown that the HDAF protocol has no benefit compare to the two others if the relay is located close to the source. In contrast, the performance gains of HDAF over the ADF and AF scheme are remarkably large as the relay moves nearby the destination. Specifically, the numerical results given as well as our analysis indicate that for QPSK modulation, HDAF outperforms ADF and AF with a performance improvement by 5 dB and 6 dB, respectively.
Place, publisher, year, edition, pages
Hindawi Publishing Corporation , 2009. Vol. 2009
IdentifiersURN: urn:nbn:se:bth-7220DOI: 10.1155/2009/479463ISI: 000268252600001Local ID: oai:bth.se:forskinfo3434E7F0B531DD5CC12575C200535CC7OAI: oai:DiVA.org:bth-7220DiVA: diva2:834803
Open Access Journal The paper is available at: http://www.hindawi.com/journals/wcn/aip.479463.html2012-11-062009-05-262015-06-30Bibliographically approved