| Paper: | SPCOM-P13.3 | ||
| Session: | Broadcast Channels / Multi-User Detection | ||
| Time: | Friday, May 19, 16:30 - 18:30 | ||
| Presentation: | Poster | ||
| Topic: | Signal Processing for Communication: MIMO multi-user and multi-access schemes | ||
| Title: | SUBF vs. MUBF in a Gaussian MIMO Broadcast Channel with Partial Channel State Information | ||
| Authors: | Youngjae Kim, John Cioffi, Stanford University, United States; Ravi Narasimhan, University of California, Santa Cruz, United States | ||
| Abstract: | Abstract—In a Gaussian MIMO broadcast channel, serving more than one user at a time is generally more beneficial in terms of average sum-rate. Under partial Channel State Information (CSI) feedback constraints, however, this paper reveals that serving only one user at a time can be a better multiple access method when the number of active users in the system is smaller than a certain threshold. This paper uses Single User Beamforming (SUBF) to refer to the transmitting scheme that serves only one user at a time and Multi-user Beam-forming (MUBF) to refer to the scheme without such a constraint, i.e., a scheme that is allowed to serve more than one user at a time. It turns out that the aforementioned user threshold varies with other system parameters, especially, it increases as the number of transmit antennas increases. Monte Carlo simulations and the statistical analysis are provided to verify the results. | ||
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