On the Pilot-Data Power Trade Off in Single Input Multiple Output Systems
2014 (English)In: 20th European Wireless Conference, EW 2014, 2014, 485-492 p.Conference paper (Refereed)
We consider a single cell single input multiple output (SIMO) system employing orthogonal frequencydivision multiplexing (OFDM). In such systems, setting the pilot-to-data power ratio (PDPR)has a large impact on the spectral and energy efficiency. In this paper we provide a closedform solution for the mean square error (MSE) of the received data as a function of thePDPR assuming Gaussian channels and minimum mean square error (MMSE) equalization.In numerical experiments we find that the MSE is a convex function of the PDPRand study the optimal PDPR as the number of antennas at the base station (BS) grows large.We find that the optimal PDPR heavilydepends on the number of antennas and the path loss between the mobile station and theBS. Specifically, as the number of antennas grows large, a larger portionof the total power budget needs to be allocated for pilot signals, especially for low pathloss users.
Place, publisher, year, edition, pages
2014. 485-492 p.
cellular networks, multi-antenna systems, power control, channel estimation
Research subject SRA - ICT
IdentifiersURN: urn:nbn:se:kth:diva-139408ScopusID: 2-s2.0-84916886482ISBN: 9783800736218OAI: oai:DiVA.org:kth-139408DiVA: diva2:686991
European Wireless, 14-16 May 2014,Barcelona, Spain
QC 201402132014-01-132014-01-132015-12-01Bibliographically approved