| Paper: | SPCOM-L4.6 | ||
| Session: | MIMO Training Design and Capacity Issues | ||
| Time: | Wednesday, May 17, 15:40 - 16:00 | ||
| Presentation: | Lecture | ||
| Topic: | Signal Processing for Communication: MIMO capacity and performance | ||
| Title: | Bounds on capacity over gaussian MIMO multiaccess channels with Channel State Information Mismatch | ||
| Authors: | César Gaudes, Enrique Masgrau, University of Zaragoza, Spain | ||
| Abstract: | In this paper, we deal with the capacity of Gaussian MIMO multiaccess fading channels when the channel knowledge available at the receiver and the transmitters is erroneous. First, upper and lower bounds on the multiaccess capacity region are presented when the channel state information is estimated by means of a MMSE criterion, and consequently, there exist some uncertainty on the channel knowledge. Then, the difference between these bounds for the joint mutual information is analyzed. A final expression for the ergodic sum-capacity gap is obtained as a function of the number of users, the quality of the channel estimates and the number of receive and transmit antennas. Computer results show that adding more users or transmit antennas reduces this gap in equal factor at high SNR. | ||
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