On the pilot-data power trade off in single input multiple output system
2014 (English)In: European Wireless 2014; 20th European Wireless Conference (EW 2014), Berlin: IEEE conference proceedings, 2014, 485-492 p.Conference paper (Other academic)
We consider a single cell single input multiple output (SIMO) system employing orthogonal frequency division 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 closed form solution for the mean square error (MSE) of the received data as a function of the PDPR assuming Gaussian channels and minimum mean square error (MMSE) equalization. In numerical experiments we find that the MSE is a convex function of the PDPR and study the PDPR that minimizes the MSE as the number of antennas at the base station (BS) grows large. We find that the MSE-minimizing PDPR heavily depends on the number of antennas and the path loss between the mobile station and the BS. Specifically, as the number of antennas grows large, a larger portion of the total power budget needs to be allocated for pilot signals, especially for low path loss users.
Place, publisher, year, edition, pages
Berlin: IEEE conference proceedings, 2014. 485-492 p.
Cellular networks; Channel estimation; MIMO systems; Power control
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-203037ScopusID: 2-s2.0-84916886482OAI: oai:DiVA.org:kth-203037DiVA: diva2:1082150
European Wireless 2014
QC 201703212017-03-152017-03-152017-03-21Bibliographically approved