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Design of Efficient Adaptive Beamforming Algorithms for Novel Mimo Architectures

Thesis Info

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Author

Engr. Jawwad Ahmad

Program

PhD

Institute

Iqra University

City

Karachi

Province

Sindh

Country

Pakistan

Thesis Completing Year

2014

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/2725/1/2716S.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725825647

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The major issue in the mobile communication is the presence of several types of im- pairments in the wireless medium. There are many types of impairments, the important one is refer to as fading which is defined as the interference occurred in the received signal because of its multiple copies arrived through multi paths. It creates considerable changes in receive signal power and therefore counted as significantly destructive in nature. Fading introduces significant distortion and disturbances in almost all wireless radio signal. The major cause of the fading is multipath propagation of the signals and the relative movement of mobile transmitting and/or receiving device. The cancellation of fading effect is essential to achieve higher data rate and better ser- vice quality with similar radiating power and/or bandwidth. Diversity is one of the im- portant techniques to reduce the effect of fading. In order to achieve different diversity types multiple input multiple output antenna array is employed. If a switchable or movable beam pattern is connected to multiple input multiple output (MIMO) antenna system; the system is referred to as smart system. In order to perform xivthis function, smart antenna requires certain signal processing and adaptive computa- tion. Such adaptive computations are performed through some algorithms known as adaptive beamforming algorithms. This dissertation develops three novel MIMO beamforming architecture using decision directed mode in order to exploit spatial and temporal diversities. Moreover, we pro- posed three new adaptive beamforming algorithms for fast convergence and high beam gain. The simulation results prove their effectiveness over other available algorithms and architectures.
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اک فرمائش

اِک فرمائش
(یہ نظم میرے استاد مرزا شہباز قمر صاحب ایڈووکیٹ مرحوم نے بطور امتحان لکھوائی تھی )
تیرے ناں توں میں جند وار دیواں
تیرے باہجھ میں ہر شئے وسار دیواں
تیری یار ادا من بھاندی اے
جوں پھل چوں خوشبو آندی اے
دیوی حسن دی روپ وکھاندی اے
کر حسن دا گرم بزار دیواں
تیری یاد دے دیوے بلدے نیں
تیرے عاشق راہواں ملدے نیں
دکھ درد ہجر دے جھلدے نیں
دکھاں چ میں عمر گزار دیواں
دل تیرے باجھ ناں رہندا اے
تیرے ملن دا ول ول کہندا اے
نہ ہجر دے دکھڑے سہندا اے
ایہنوں کنی ہجر دی مار دیواں
تیرے عشق دے زخم نہ بھردے نیں
کئی وید علاج پئے کردے نیں
جیہڑے عشق چنھاں وچ تردے نیں
میں جند اوہناں توں وار دیواں
تیرے شوق نے حال بے حال کیتا
نشہ شوق شراب میں بھال پیتا
سینہ چاک ہویا تساں نہ سیتا
دل ہور نوں ناں سوہنے یار دیواں
دلبر وے مینوں کول بلا
میں تتڑی تے کرم کما
مکھڑے توں گھنڈ لاہ وکھا
میں رب دا شکر گزار دیواں
جدوں تکیا پہلی واری سی
جند جان سجن تے ہاری سی
چڑھی عشق دی بڑی خماری سی
جند دے کے قرض اُتار دیواں
سب سوہنیا توں ہیں سوہنا توں
ہک سوہنا تے من موہنا توں
مینوں دے گیا ہیں ہجر دا رونا توں
تیری خاطر چھڈ گھر بار دیواں
اوتھے قادریؔ سائیں خیر ہووے
جتھے پیر میرے دا پیر ہووے
شالا ہر دم اوہدی خیر ہووے
اوہدے در تے عمر گزار دیواں

EFFECTS OF CRANIOCERVICAL FLEXION EXERCISES AND SCAPULAR STABILIZATION EXERCISES IN NECK PAIN AND FORWARD HEAD POSTURE AMONG FEMALES WEARING HEADSCARVES

Background: In neck related problems, limited cervical ranges are considered a major contributor leading to forward head posture and increased disability. Methodology: The study design was a randomized clinical trial. Total of 50 subjects were recruited that fulfilled the selection criteria. Subjects were divided into two groups. Craniocervical flexion exercises group A (n=25) and Scapular stabilization exercises group B (n=25). Numeric Pain Rating Scale (NPRS) and Neck Disability Index (ND1) were subjective while the goniometer and plumb line were used as objective modes of assessment. Baseline and after 4 weeks of treatment values were assessed by using SPSS 21. Results: Both groups showed improvement in plumb line values, forward head posture and cervical spine mobility. NPRS, and NDI score values after the 4-week exercise program showed significant results (p-value<0.05). Outcomes except for plumb line value and NDI score indicated statistically significant improvement in the Craniocervical flexion exercise group than the scapular stabilization exercise group (p-value<0.05). However, in NPRS no statistical difference (p-value>0.05) was found between the two groups. Conclusion: Only females were recruited. Further studies can correlate with spatiotemporal features. The idea and conceptual framework were original.

Epidemiology of Principal Viral Respirtaory Pathogens in Pakistani Children and Molecular Characterization of Influenza A/H3n2 and Respiratory Syncytial Viruses

21 ABSTRACTBSTRACTBSTRACTBSTRACTBSTRACTBSTRACTBSTRACT Acute respiratory infections (ARI) are associated with high morbidity and mortality rates at the global level. Approximately 20% of the deaths attributable to pneumonia globally occur in Pakistan with nearly one half the infections among children younger than 5 years of age. The objectives of this study were to define the molecular epidemiology of respiratory viruses in Pakistani children and to identify viral genotypes causing respiratory infections. In this study, we analyzed 1941 respiratory samples collected over three winter seasons and tested for common respiratory pathogens using real time PCR. We found 76% prevalence rate for viral pathogens with Influenza and RSV predominant among 0.01-6 and 12-24 months age groups respectively. Fever and cough were identified as significant clinical parameters along with malnutrition and maternal breastfeeding. Furthermore, phylogenetic analysis of representative Influenza A/H3N2 viruses showed that recent viruses belonged to subgroup 3C.3 and carried important amino acid substitutions in the H3 hemagglutinin, while no substitutions attributable to neuraminidase resistance were detected. We genotyped the Respiratory Syncytial viruses subtypes and analyzed the two surface glycoproteins G and F of over100 isolates. All RSV-A strains carried 297 amino acids long G protein and clustered in the NA1/GA2 genotype. We also reported a novel RSV B genotype BA-13 and two other genotype variants (BA-9 and BA-10). We analysed the fusion protein F in RSV A isolates at the binding sites for the monoclonal antibodies Palivizumab and Motavizumab specifically and found that the N276S substitution in over 90% of RSVA and all RSVB viruses. This work highlights the need for respiratory disease surveillance as it will support the development of appropriate public health surveillance programs to inform health planning.