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Sum Rate Analysis of the Array of Subarrays Structures for mmWave Systems
Najam Us Saqib,Sang-Woon Jeon(전상운) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
We consider the array structure to improve data rates for millimeter wave communication systems. Particularly, by fully utilizing the array of subarrays (AOSA) structure, we perform extensive simulation with various subarray sizes in the AOSA to examine their effects for urban micro scenarios. It is shown that the vertical stacking of subarrays outperforms other combinations with a fixed tilt angle. The sum rate performance is also analyzed based on the number of radio frequency chains among different frequencies.
us Saqib, Najam,Rehan, Muhammad,Iqbal, Naeem,Hong, Keum-Shik Institute of Electrical and Electronics Engineers 2018 IEEE transactions on control systems technology Vol. No.
<P>In this brief, a novel scheme to design an antiwindup gain by ensuring local stability for nonlinear parameter varying systems having an input saturation is derived. Antiwindup compensator (AWC) design is provided for a dynamic output feedback controller that meets the desired closed-loop stability and performance specifications in the absence of the input saturation. A linear matrix inequality-based condition by application of Lyapunov theory, a local sector condition, an upper bound on the nonlinearity, and parametric bounds is formulated for the AWC design to ensure asymptotic and <TEX>$\mathcal {L}_{2}$</TEX> stability. In contrast to the conventional approaches for nonlinear systems, the proposed AWC approach accounts for parametric variations, considers computationally simple static antiwindup, is straightforward for implementation, is useful for the existing control system, and can reduce the design conservatism. The proposed AWC design approach is tested for a practical scenario on the dc servo system control under armature nonlinearity, load variations, and control input saturation. Both simulation and experimental results are provided.</P>
Capacity Analysis for mmWave Communication Systems Based on 3D Spatial Propagation Models
Najam Us Saqib(사킵 나잠어스),Muhammad Sajid Haroon(무하마드 사지드 하룬),Hoon-Geun Song(송훈근),Sang-Woon Jeon(전상운) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
We present the capacity analysis of the millimeter Wave (mmWave) systems in a realistic 3-dimensional spatial channel model (3D-SCM) provided by the third-generation partnership project (3GPP). With the consideration of analog elevation beamforming in 3D Urban Micro Streat Canyon (UMi-Street Canyon) environment, capacity comparisons are performed considering mmWave frequencies. In particular, several factors such as rand and gas losses are analyzed, which have significant effects on channel capacity for high frequency communications.
Anti-windup Compensator Synthesis for Cascaded Linear Control System
Muntazir Hussain,Najam us Saqib,Muhammad Rehan,Muhammad Siddique 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
In this article a method is proposed for anti-windup compensator (AWC) design for linear cascaded systems. Instead of using the conventional methods for designing AWC, we used the decoupled based architecture to design the AWC gains for the saturated linear cascades systems. The global sector condition is employed to derive the necessary condition for the global exponential and L2 exponential stability of the proposed AWC schema. Furthermore a regional AWC design conditions are derived applicable for stable as well as unstable cascaded systems. Finally, simulation example is presented to show the effectiveness of the proposed anti-windup compensator (AWC) techniques for linear cascaded control systems.
mmWave Path-loss, Joint Rain and Gas losses Effect Analysis Based on ITU Street Canyons Scenarios
Muhammad Sajid Haroon(무하마드 사지드 하룬),Najam Us Saqib(사킵 나잠어스),Hoon-Geun Song(송훈근),Sang-Woon Jeon(전상운) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
Besides high phase noise, doppler spread, and limited range, path-loss is one of the prominent performance limiting factors at higher millimetre wave (mmWave) frequency bands. This work evaluates the path-loss for different setups at the frequencies 28 and 60 GHz. This study utilizes site-general and site-specific (mmWave propagation) models under street-canyons from ITU-R P.1411-10. Moreover, for mmWave propagation model, additional losses by rain and gasses are calculated by using the procedure given in ITU-R P.530-17 and ITU-R P.676-12, respectively. The results demonstrate that mmWave propagation model leads to higher path-losses as compared with site general model due to additional rain and gas losses. Moreover, higher frequencies and longer separation distances leads to significant path-loss for all the considered scenario. Furthermore, rain losses are observed to be more detrimental as compared with gas losses.