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Massive MIMO system lower bound spectral efficiency analysis with precoding and perfect CSI

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Digital Communications and Networks 2021年第3期7卷 342-351页

作者： Tasher Ali sheikh Joyatri Bora Md Anwar hussain Department of Electronics and Communication Engineering North Eastern Regional Institute of Science and TechnologyNirjuliArunachal Pradesh791109India

The analytical lower bound of Spectral Efficiency(SE)of downlink transmission of the Massive Multiple Input Multiple Output(Ma-MIMO)system is *** this paper,we derive some novel and approximate mathematical expressions for the lower bound of the SE of a Ma-MIMO with linear precoding schemes,i.e.,Minimum Mean Square Error(MMSE)and Zero-Forcing(ZF).For simulation analysis of the SE,we consider three joint users and antenna scheduling algorithms,namely,the semi-orthogonal,random,and distance-based user scheduling algorithms,whereas the antennas are selected based on Maximum Signal to Noise Ratio(MSNR)with scheduled *** channel between the user and the transmitter is assumed to have characteristics of Small Scale Fading(SSF)and Large Scale Fading(LSF)with the Rayleigh fading *** investigate the effect of the variation of transmitting SNR,the number of base station antennas(M),and the radius(R)of the cell area on the *** simulate the downlink transmission of Ma-MIMO and compare the simulation and analytical *** is observed that the trends of variation of both results are similar to the variation of identical factors,and the difference between the simulated and analytical lower bounds of the SE is approximately 1-1.5 *** analytical lower bound is smaller than the simulation result.

关键词： Fifth-generation Spectral efficiency Ma-MIMO LSF coefficient Precoding

Capacity maximizing in massive MIMO with linear precoding for SSF and LSF channel with perfect CSI

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Digital Communications and Networks 2021年第1期7卷 92-99页

作者： Tasher Ali sheikh Joyatri Bora Md.Anwar hussain Department of Electronics and Communication Engineering Nordi Eastern Regional Institute of Science and TechnologyNirjuliArunachal Pradesh791109India

The capacity of a massive MIMO cellular network depends on user and antenna selection algorithms,and also on the acquisition of perfect Channel State Information(CSD).Low computational cost algorithms for user and an-tenna selection significantly may enhance the system capacity,as it would consume a smaller bandwidth out of the total bandwidth for downlink *** objective of this paper is to maximize the system sum-rate capacity with efficient user and antenna selection algorithms and linear *** consider in this paper,a slowly fading Rayleigh channel with perfect acquisition of CSI to explore the system sum-rate capacity of *** MIMO *** user selection,we apply three algorithms,namely Semi orthogonal user selection(SUS),Descending Order of SNR-based User Scheduling(DOSUS),and Random User Selection(RUS)*** all the user selection algorithms,the selection of Base Station(BS)antenna is based on the maximum Signal-to-Noise Ratio(SNR)to the selected *** users are characterized by having both Small Scale Fading(SSF)due to slowly fading Rayleigh channel and *** Fading(ISF)due to distances from the base ***,we use linear precoding techniques,such as Zero Forcing(ZF),Minimum Mean Square Error(MMSE),.and Maximum Ratio Transmission(MRT)to reduce interferences,thereby improving average system sum-rate *** using SUS,DOSUS,and RUS user selection algorithms with ZF,MMSE,and MRT precoding techniques are *** also analyzed and compared the computational complexity of all the three user selection *** computational complexities of the three algorithms that we achieved in this paper are 0(1)for RUS and DOSUS,and 0(M^2N)for suS which are less than the other conventional user selection methods.

关键词： Massive MIMO User selection Antenna selection Complexity DOSUS and antenna selection 5G

Formation of crystalline particles from phase change emulsion： Influence of different parameters

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Chinese Journal of Chemical Engineering 2016年第7期24卷 929-936页

作者： Javed Iqbal Zulfiqar Ali Murid hussain Rizwan sheikh Khaliq Majeed Asad Ullah Khan Joachim Ulrich COMSATS Institute of Information Technology Department of Chemical Engineering Defence Road Off Raiwind Road Lahore Pakistan Martin-Luther-Universitat Halle-Wittenberg Zentrum fur Ingenieurwissenschaften Verfahrenstechnik/TVT D-06099 Halle (Saale) Germany

Solidification or crystallization of phase change emulsion in the form of fine emulsion drops in a direct contact coolant at temperatures below their freezing point was studied. This work is mainly focused on the size and shape of the generated partides from phase change emulsified fats. Size of the particles is the major or key factor being considered during their formation, however, other factors that govern the particle size and shape were also observed. The operating parameters of the process were optimized in order to obtain particles of smaller size ranges in the window of current operating conditions. The crystallization of complex emulsion maffices is very difficult to control in the bulk at desired requirement. Hence, the emulsion drop to particle formation has advan- tage in comparison with the bulk solidification or crystallization. The main objective of this work is to achieve spherical emulsion particles in a direct contact cooling system. Parameters like： stat）ility, characterization, viscos- ity, and the effect of different energy inputs were examined. Moreover, the effects of the capillary size, interracial tension, temperature of the emulsion on the particle size were also monitrored.

关键词： EmulsionParticle formationSizePhase changeInterracial tension

Morphometric Analysis of Foramen Magnum in the Determination of Sex Using Computed Tomography

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Journal of Forensic Science and Medicine 2021年第1期7卷 9-13页

作者： Bashir Ahmad Wani Nusrat Nazir Rayees Ahmad sheikh Altai hussain Chalkoo Tauseefa Jan Department of Oral Medicine and Radiology Government Dental CollegeSrinagarJammu and KashmirIndia

Background:sex identification by morphological assessment of various bones of the skeleton had been one of the oldest approaches in forensic anthropology and medico-legal *** and Objective:The aim of this study was to make the morphometric measurements of the foramen magnum in determining the feasibility of sex determination using computed tomography(CT).Materials and Methods:The data for our study was obtained from 100 patients having CT scan of the head and neck region(Siemens Somatom 256 slice CT scanner)with 1mm contiguous axial scans using bone window settings(2000 HU with 400 HU in centre),scan time of one second and exposure parameters 140 kVp and *** different measurements taken include the antero-posterior(AP)diameter,transverse diameter and area of the foramen ***:There were 50 males and 50 females with the age range of 18 to 75 *** have a higher average value than females in all of the parameters measured on foramen *** using Studenfs T-test,all the measured parameters showed significant difference between the sexes(p<0.01).Conclusion:The expression of sexual dimorphism in the foramen magnum region shows significant difference between the sexes,therefore this area of the skull should be considered a useful area in the identification of sex.

关键词： Computed tomography foramen magnum sex determination sexual dimorphism

Multi-scale processes influencing global carbon storage and land-carbon-climate nexus:A critical review

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Pedosphere 2023年第2期33卷 250-267页

作者： Owais Ali WANI Shamal Shasang KUMAR Nazir hussain Anas Ibni Ali WANI Subhash BABU Parvej ALAM Megna RASHID Simona Mariana POPESCU sheikh MANSOOR Division of Soil Science and Agricultural Chemistry Sher-e-Kashmir University of Agricultural Sciences and Technology(SKUAST)Kashmir 193201(India) Division of Agronomy SKUASTKashmir 193201(India) Shri Mata Vaishno Devi University Katra 182301(India) Division of Agronomy ICAR-Indian Agricultural Research InstituteNew Delhi 110012(India) Department of Biology College of Science and HumanitiesPrince Sattam Bin Abdulaziz UniversityAlkharj 11942(Saudi Arabia) Faculty of Forestry SKUASTKashmir 191201(India) Department of Biology and Environmental Engineering University of CraiovaCraiova 200585(Romania) Division of Biochemistry Faculty of Basic SciencesSKUASTJammu 180009(India)

Carbon(C)is a key constitutive element in living organisms(plants,microbes,animals,and humans).Carbon is also a basic component of agriculture because it plays a dynamic role in crop growth,development,nutrient cycling,soil fertility,and other agricultural *** presence of C enhances soil physical,chemical,and biological *** C cycle supports all life on the Earth by transferring C between living organisms and the *** global climate is changing,and this change is attributable to the release of carbon dioxide and other greenhouse gases from human *** to the global climate change,agriculture is expected to be majorly *** production is directly linked to the *** five main global C pools are the oceanic,geologic,pedologic,atmospheric,and biotic pools,with specific reservoirs and inter-pool *** soil organic matter has various organic C pools(active,slow,and passive pools),containing various C-based fractions and specific liability ***,geology,land use,and management techniques are some of the variables that affect organic C and its *** dynamics of each of these variables must be understood for a thorough knowledge of how they impact the soil C pools and storage capacity under the changing climate *** review provides a comprehensive overview of the various factors that affect soil C pools/fractions and their C sequestration capacity.

关键词： carbon dynamics carbon pools carbon sequestration climate change climate-smart agriculture land use management practice soil organic carbon

Effects of droplet size and spray interval on root-to-shoot ratio,photosynthesis efficiency,and nutritional quality of aeroponically grown butter head lettuce

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International Journal of Agricultural and Biological Engineering 2022年第1期15卷 79-88页

作者： Mazhar hussain Tunio Jianmin Gao Waqar Ahmed Qureshi Sher Ali sheikh Jiedong Chen Farman Ali Chandio Imran Ali Lakhiar Kashif Ali Solangi School of Agricultural Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

The proper selection of the atomizer(droplet size)and nutrient solution spray interval is one of the most important factors to be investigated in aeroponics system for sustainable *** aim of this study was to research the effects of four aeroponics atomizing nozzles(one air-assisted;A_(1),two air-less;A_(2) and A_(3),and one ultrasonic fogger;A_(4))with droplet sizes of 11.24μm,26.35μm,17.38μm,and 4.89μm,respectively,four spray intervals(15 min(I_(1)),30 min(I_(2)),45 min(I_(3))and 60 min(I_(4)))at a 5 min of constant spray time by atomizing the Hoagland’s nutrient solution on growth,root-to-shoot ratio,photosynthesis characteristics,pigments,and nutritional quality of the aeroponically grown *** experimental results demonstrated that in A_(1) atomizer and I_(2) interval,the growth,photosynthesis efficiency,chlorophyll,carotenoids,and nutritional values of the lettuce were significantly higher compared to that grown in A_(2) and A_(3) atomizers at all spray *** shoot developments were more constrained than root,prominent to the alteration of root-to-shoot ratio(fresh and dry)in the influence of different droplet sizes and spray ***,the plants did not grow well in A_(4) atomizer associated with proposed spray *** results disclosed that there was an obvious interaction between droplet sizes(atomizers)and spray intervals for growth,the ratio of root to shoot,photosynthesis efficiency,pigments,and nutritional quality of the aeroponically grown *** research study increases the awareness of the proper droplet size(atomizer)and the regulation of nutrient solution spray interval for leafy vegetables grown in an aeroponics system.

关键词： aeroponics system atomizers droplet sizes photosynthesis efficiency chlorophyll contents quality of lettuce

Advances in reduction of NO_x and N_2O emission formation in an oxy-fired fluidized bed boiler

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Chinese Journal of Chemical Engineering 2019年第2期27卷 426-443页

作者： Khalid El sheikh Mohammad Jakir Hossain Khan Mahar Diana Hamid Siddhartha Shrestha Brahim Si Ali G.A.Ryabov Lya A.Dolgushin Mohd Azlan hussain Tatiana V.Bukharkina Elena A.Gorelova Dmitry Mendeleev University of Chemical Technology of Russia Department of Chemical Engineering Faculty of Engineering University of Malaya Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical Engineering Monash University All-Russian Thermal Engineering Institute VTI

Fossil fuel combustion is one of the major means to meet the mounting global energy demand. However, the increasing NO_x and N_2 O emissions arising from fossil fuel combustion process have hazardous effects. Thus, mitigating these gases is vital to attain a sustainable environment. Interestingly, oxy-fuel combustion in fluidized bed for carbon capture and minimized NO_x emissions is strongly sustainable compare to the other approaches. It was assessed that NO_x formation and fuel-N conversion have significant limitation under oxy-fluidized bed compared to air mode and the mechanism of NO_x formation is still deficient and requires further development. In addition, this review paper discussed the potential of primary measure as low emission process with others supplementary techniques for feasible NO_x reduction. The influences of combustion mode, operating parameters, and reduction techniques such as flue gas recirculation, oxygen staging, biomass co-firing, catalyst, influence of fluidized bed design and structure, decoupling combustion and their merges are respectively evaluated. Findings show that significant minimization of NO_x emission can be achieved through combination of primary and secondary reduction techniques.

关键词： Oxy-fuel combustion Fluidized bed technology Biomass blend Primary/secondary measures NOx emission

Optimum Design of Subband Coder for a First Order Autoregressive Process

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Optimum Design of Subband Coder for a First Order Autoregres...

Use of instantaneous energy of ABR signals for fast detection of wave V

2002年IEEE十区计算机、通信、控制和电机工程会议

作者： Mohsen Ashourian sheikh hussain S.Salleh Faculty of engineering Azad university of Iran.Mailesi Branch Esfahan Iran Faculty of engineering Azad university of Iran.Mailesi Branch Esfahan Iran Faculty of engineering Azad university of Iran.Mailesi Branch Esfahan Iran

This paper provides a method for analysis and designof subband coder with involving quantization effect. A jointoptimization method for design of filter banks and relateddithered quantizers by using time-domain formulation isproposed. To show the effectiveness of design method, theoptimum filters are calculated for a first order autoregressiveprocess in a paraunitary filter bank and results are compared witha non-modified subband coder. Experiments show that byappreciate choice of synthesis filter bank, it would be possible toreplace signal-dependent artifacts with signal-independent whitenoise and also reduce the mean square error of reconstructionsignal.

关键词： Subband Coding Dithering Quantization

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Journal of Biomedical Science and Engineering 2010年第8期3卷 816-821页

作者： Adeela Arooj Mohd Rushaidin Muhamed sheikh hussain Shaikh Salleh Mohd Hafizi Omar 不详

Brainstem evoked response audiometry is a powerful diagnostic technique in audiology, otology and neurology. ABR(Auditory Brainstem Response) machine has been very useful and popular in past two decades for detection of hearing defects and pathologies in newborns and children. In ABR, wave V is the most prominent and robust wave that has been used as indicator of hearing loss. However, a fast detection of the wave V is necessary in order to implement newborn hearing screening. Researchers have introduced different kind of signal processing technique in order to achieve this target and one of this is Fast Fourier Transform (FFT) and Wavelet Transform. In this study, the instantaneous energy of ABR signal had been introduced as a marker to identify the ABR waves. Study showed that the instantaneous energy of auditory brainstem response can be used as a marker to identify the ABR waves. This study had proposed a platform for fast hearing screening system.

关键词： Auditory Brainstem Response Neonate Hearing Screening Instantaneous Energy