A frequency domain condition for stability of interconnected MIMO systems

2004 ◽  
Author(s):  
A. Gattami ◽  
R. Murray
Keyword(s):  
Frequency Domain ◽  
Mimo Systems ◽  
Domain Condition

Behavioral modeling and digital pre-distortion techniques for RF PAs in a 3 × 3 MIMO system

2019 ◽  
Vol 11 (10) ◽  
pp. 989-999 ◽  
Author(s):  
Mahmoud Alizadeh ◽  
Peter Händel ◽  
Daniel Rönnow
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Mimo Systems ◽  
Mimo System ◽  
Parameters Estimation ◽  
Behavioral Modeling ◽  
Type Model ◽  
Rf Power Amplifiers ◽  
Model Errors ◽  
Frequency Domains

AbstractModern telecommunications are moving towards (massive) multi-input multi-output (MIMO) systems in 5th generation (5G) technology, increasing the dimensionality of the systems dramatically. In this paper, the impairments of radio frequency (RF) power amplifiers (PAs) in a 3 × 3 MIMO system are compensated in both the time and the frequency domains. A three-dimensional (3D) time-domain memory polynomial-type model is proposed as an extension of conventional 2D models. Furthermore, a 3D frequency-domain technique is formulated based on the proposed time-domain model to reduce the dimensionality of the model, while preserving the performance in terms of model errors. In the 3D frequency-domain technique, the bandwidth of the system is split into several narrow sub-bands, and the parameters of the model are estimated for each sub-band. This approach requires less computational complexity, and also the procedure of the parameters estimation for each sub-band can be implemented independently. The device-under-test consists of three RF PAs including input and output cross-talk channels. The proposed techniques are evaluated in both behavioral modeling and digital pre-distortion (DPD) perspectives. The experimental results show that the proposed DPD technique can compensate the errors of non-linearity and memory effects in the both time and frequency domains.

scholarly journals Robust control system design in frequency domain

2013 ◽  
Vol 23 (1) ◽  
pp. 61-78 ◽  
Author(s):  
Vojtech Veselý ◽  
Jakub Osuský
Keyword(s):  
Robust Control ◽  
Frequency Domain ◽  
Controller Design ◽  
Mimo Systems ◽  
Additive Model ◽  
Water System ◽  
Design Procedure ◽  
Robust Control System ◽  
Small Gain ◽  
Tank Water

Abstract In this paper two robust control methods for hybrid system are presented. Both methods are usefull for SISO and MIMO systems. Controller design procedure is developed in frequency domain. Equivalent subsystem method is used for controller design in this paper. Stability condition of proposed methods bases on small gain theory and uses additive and inverse additive model type. Two tank water system is presented in the paper and serves as a numerical example to compare effectiveness of described methods

Frequency-domain L 2-stability conditions for time-varying linear and nonlinear MIMO systems

2014 ◽  
Vol 12 (1) ◽  
pp. 13-34 ◽  
Author(s):  
Zhihong Huang ◽  
Y. V. Venkatesh ◽  
Cheng Xiang ◽  
Tong Heng Lee
Keyword(s):  
Frequency Domain ◽  
Mimo Systems ◽  
Stability Conditions ◽  
Time Varying ◽  
Linear And Nonlinear

scholarly journals SBL Kalman Filter Based Hybrid Precoder/ Combiner for mmWave MIMO Systems: A Frequency Domain Approach

2021 ◽  
Author(s):  
Shoukath Ali k ◽  
Sampath Palaniswami
Keyword(s):  
Kalman Filter ◽  
Frequency Domain ◽  
Orthogonal Frequency Division Multiplexing ◽  
Mimo Systems ◽  
Least Square ◽  
Ofdm Systems ◽  
Millimetre Wave ◽  
Minimum Number ◽  
Mimo Ofdm ◽  
Frequency Domain Approach

Abstract The optimal design of hybrid precoder/ combiner for Millimetre Wave (mmWave) Multiple Input and Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM ) system is developed presented. In the frequency domain approach, Sparse Bayesian Learning - Kalman Filter (SBL-KF) algorithm is used to design the optimal hybrid precoder/ combiner in mmWave MIMO OFDM systems. Sparse signal recovery problem for Single Measurement Vector (SMV) is discussed, that is close to the design of ideal digital baseband precoder by maximizing the mutual information from the hybrid precoder. SBL-KF scheme select the minimum number of active Radio Frequency (RF) chains based on the hyper parameter estimator. The minimum number of RF chain is approximate the ideal digital precoder / combiner design. Proposed SBL-KF scheme achieve low power consumption and enhanced spectral efficiency, when compared to the SBL, Orthogonal Matching Pursuit (OMP), Simultaneous OMP (SOMP) and Least Square schemes, which activate a fixed data streams and fixed number of RF chains.

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