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This paper focuses on the feedback scheme for downlink Multi-User Multiple-Input Multiple-Output (MU-MIMO) transmission with linear precoding. When the maximum transmission rank per user is limited to one, the multiple-antenna receiver uses a weight vector to transform MIMO channel matrix into an equivalent Multiple-Input Single-Output (MISO) channel vector. Then a Channel Directional Index (CDI)...
This paper addresses a feedback stabilization problem for linear time-invariant dynamical systems where the feedback control loop is closed over a noiseless time-variant and rate-limited communication link. In contrast to the previous work, we assume a set of scalar quantizers and propose a method for stabilizing the system at reduced data rates.
This paper concerns the average consensus problem with the constraint of quantized communication between nodes. A broad class of algorithms is analyzed, in which the transmission strategy, which decides what value to communicate to the neighbours, can include various kinds of rounding, probabilistic quantization, and bounded noise. The arbitrariness of the transmission strategy is compensated by a...
We investigate the performance of limited feedback zero forcing beamforming-based MU-MIMO in correlated channels when users have the opportunity to adapt their codebooks as a function of their own channel statistics (CDIT). An upper bound on the rate loss is derived in terms of the amount of feedback and the statistics of the channel. In order to maintain a constant rate loss with respect to the perfect...
Stability of model-based networked control systems is considered in view of the quantization effect which exists generally in networked setting. It is to be noted that the stability rests with the quantization errors at every transmission time. For different initial quantization errors, necessary and sufficient conditions for system to be globally exponentially stable or the stable regions of the...
This paper studies the stability of a quantized feedback control system. In recent years, there have been a number of papers characterizing the minimum information rate required to assure closed loop stability. An inherent constraint on these quantized control systems is that the number of quantization levels must be an integer. In our opinion, insufficient attention has been paid to this constraint...
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