Abstract
MIMO broadcast channels with partial channel knowledge at the transmitter are considered, obtained via limited- rate feedback. Given a maximum orthogonality factor e between transmit beamforming vectors (e = 0 if orthogonal beamforming) and variable number of active beams, the design of scalar feedback metrics for user scheduling is studied. These metrics provide an estimate of the received signal-to-noise plus interference ratio (SINR) and can take the form of either an upper or lower bound on the SINR. A closed-form expression for the sum-rate is provided, showing the performance of each metric in different scenarios. Analytical and simulation results are shown in order to identify the regions where SDMA provides higher rates than TDMA.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
