Closed-Form Sum-MSE Minimization for the Two-User Gaussian MIMO Broadcast Channel
2011 (English)In: IEEE Communications Letters, ISSN 1089-7798, Vol. 15, no 9, 950-952 p.Article in journal (Refereed) Published
We study the Gaussian multiple-input, multipleoutput broadcast channel, where a base station with 𝑁𝑇 antennas transmits 𝐾 independent messages to 𝐾 users, each having a single receive antenna. The messages consist of independent, identically distributed Gaussian random variables and we study linear transmission with an end-to-end distortion criterion. By using an already established uplink/downlink duality and a recently discovered special relation between beamforming vectors and channel vectors, we present a closed-form expression for the optimal power allocation in the two-user case. We also outline an iterative algorithm that finds the optimal power allocation for an arbitrary number of users.
Place, publisher, year, edition, pages
IEEE , 2011. Vol. 15, no 9, 950-952 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-70179DOI: 10.1109/LCOMM.2011.070711.110571ISI: 000294894500016OAI: oai:DiVA.org:liu-70179DiVA: diva2:436486
FunderKnut and Alice Wallenberg FoundationSwedish Research Council