Array signal processing, Broadcast channels, Feedback systems, MIMO systems, Time-varying channels
This work explores the performance of a multiple-input multiple-output broadcast channel where both the transmitter and receivers have outdated channel knowledge due to node motion or other time-variations in the communication channel. A performance analysis based on measured channel responses reveals significant throughput degradation for optimal linear and nonlinear precoding strategies unless the channel state information (CSI) is frequently fed back to the transmitter. The paper then develops a linear beamforming precoding strategy based on channel distribution information in the form of a full spatial correlation matrix for each user. This algorithm is shown to provide highly stable communication, with a throughput that is higher than that for optimal precoders operating on outdated CSI, in a time-variant environment, indicating that this approach can operate with significantly reduced feedback frequency. Furthermore, the paper demonstrates the use of the well-known Kronecker and Weichselberger models to parameterize the full correlation matrix to enable further reduction in the amount of feedback data required for implementation of the new beamforming technique.
Original Publication Citation
Anderson, A., J. Zeidler, and M. Jensen. "Reduced-Feedback Linear Precoding with Stable Performance for the Time-Varying MIMO Broadcast Channel." Selected Areas in Communications, IEEE Journal on 26.8 (28): 1483-93
BYU ScholarsArchive Citation
Jensen, Michael A.; Anderson, Adam L.; and Zeidler, James R., "Reduced-feedback linear precoding with stable performance for the time-varying MIMO broadcast channel" (2008). Faculty Publications. 163.
Ira A. Fulton College of Engineering and Technology
Electrical and Computer Engineering
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