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Parameter estimation of adaptive receiver for MC-CDMA system

Thesis Info

Author

Muhammad Nadeem Ali

Supervisor

Muhammad Amir

Department

Department of Computer Science and Software Engineering

Program

MS

Institute

International Islamic University

Institute Type

Public

City

Islamabad

Province

Islamabad

Country

Pakistan

Thesis Completing Year

2016

Thesis Completion Status

Completed

Page

65

Subject

Computer Science

Language

English

Other

MS 621.38216 ALP

Added

2021-02-17 19:49:13

Modified

2023-01-07 22:47:39

ARI ID

1676722241334

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مولانا سید اسعد مدنی

مولانا سید اسعد مدنی ؒ
افسوس صد افسوس کہ ۶؍ فروری کو مولانا اسعد مدنی نے داعی اجل کو لبیک کہا، اناﷲ وانا الیہ راجعون، ان کی وفات قوم و ملت کا بڑا خسارہ ہے۔
راقم نے انہیں کئی بار دیکھا اور اس حال میں دیکھا جب وہ صحت مند، توانا، تروتازہ، متحرک اور جوش عمل سے سر شار تھے لیکن ملاقات کا شرف دو تین بار ہی حاصل ہوا، مارچ ۱۹۸۸؁ء میں ان کے والد بزرگوار مولانا سید حسین احمد مدنیؒ پر مسجد عبدالنبی نئی دہلی میں سمینار ہوا تھا جس کے کنویز ڈاکٹر رشید الوحیدی مرحوم تھے، اس میں پہلی بار ان سے شرف نیاز حاصل ہوا، بڑی بشاشت اور گرم جوشی سے ملے، آخری بار ۱۹۹۲؁ء میں سعودی سفارت خانے سے حج بیت اﷲ کا ویزا لینے گیا تو دفعتاً ان پر نظر پڑی، لپک کر ملا، دریافت کرنے پر اپنے کو بتایا تو قریب کی کرسی پر بیٹھنے کے لیے کہا اور کچھ دیر تک باتیں کیں، غالباً بیماریوں کا سلسلہ شروع ہوچکا تھا، اس لیے مجھے بہت مضمحل اور بجھے بجھے سے نظر آئے۔
مولانا اسعد صاحب ۵؍ نومبر ۲۰۰۵؁ء کو وہیل چیئر سے گرگئے، سر اور دماغ میں چوٹ آئی، عصر کی نماز کی تیاری کررہے تھے کہ بے ہوش ہوگئے اور دہلی کے اپولو اسپتال میں داخل کیے گئے جہاں تین ماہ تک موت و حیات کی کشمکش میں مبتلا رہنے کے بعد ۶ فروری کو ہزاروں لاکھوں عقیدت مندوں کو سوگوار اور اشک بار چھوڑ کر رفیق اعلا سے جاملے۔
اس وقت مسلمان بڑی ابتلا اور کشمکش کے دور سے گزر رہے ہیں، ملی قیادت کا میدان مولانا حفظ الرحمان مرحوم کے بعد ہی سے خالی چلا آرہا تھا، مولانا اسعد کی جرأت و بے باکی سے اس کی تلافی ایک حد تک ہوئی مگر ان کے اٹھ...

جرم وسزا کا اسلامی تصور: معاشرتی اثرات کا تجزیاتی مطالعہ

Islam provides a systematic system of crime and punishment through the Qur'an. The Qur'an first urges everyone to believe in Allah and the Last Day. And after that he commands piety. In the presence of which man's heart and mind remain free from sin. The Qur'an presents the concept of a society in which everyone meets his basic needs and desires in a legitimate way. And it does not have to resort to illegal and criminal means to meet these needs. When crime is not eliminated in these two ways, then the state orders the imposition of  sanctions. Islam is not limited to severe punishments. It calls for the establishment of a social system in which there is no room for crime. Even so, if a person commits a crime, the state punishes him as a warning. People can learn from these punishments and refrain from following the path of sin. The Qur'an also commands a group of Muslims to be present at the time of punishment.

Error Tolerant Video Streaming in Ieee Wlan

Broadband network proliferation at higher bit rates has spurred a host of multimedia streaming applications like internet video surveillance, live broadcast of international events, distant learning and entertainment etc. Wireless networks have been recognized as the most popular networking technology due to their flexible infrastructure, portability and easy deployment. Today''s wireless internet user is truly global and can access content free of space or time constraints. But the caveat is that efficient streaming of multimedia contents over wireless links has proven to be an open research problem. In-time packet delivery and successful play out on receiver end are stringent quality requirements of any bandwidth intense, delay-sensitive real time multi-media application. However, wireless link characterized by fluctuating channel bandwidth and route obstacles results in transmitted signal attenuations or loss thus adversely affect the played back video quality. Ultimately, efficient streaming of multimedia contents over error prone wireless links has emerged as one of the most challenging problems of the current era of digital communication. However, applying unequal error protection strategies and avoiding unnecessary packet discard at various network levels yield valuable outcomes. In this research work, an error control mechanism has been proposed that enables a multimedia application to adapt the video bit rate gracefully with changing channel conditions based on intelligent network estimation. Intelligent link estimation triggers the rate adaptation on sender side through reducing the video bit rate by re-encoding at lower quantization scale. In addition, an error frame forwarding approach based on the idea of discriminating video streaming calls from the data packeting over IEEE WLAN channels through bit demarcation in network packet headers. Error computation at various network levels are evaluated and disabled in order to attain efficient utilization of channel data rates characterized by minimized re-transmissions and reduced delays with least error checksum computations and packet re-transmissions, increased throughput characterized by the higher number of packets available for decoding and enhanced multimedia visual quality due to gap elimination (appears as a consequence of some frame loss). Results have been supported through experimentation involving numerous video statistics as well as tools and techniques that can possibly be deployed in standard video codecs. Objective and Subjective quality assessments have yielded the encouraging outcomes for a mix of standard video clips (foreman, mother daughter, tennis) with variable mobility level (degree of variations in background and foreground frame contents). Reconstructed video assessment has further been improved through deploying perceptual quality tool with a rich set of parameters available for precise and complete QoE based video analysis. It has been observed that proposed error control strategy has outperformed the traditional error elimination techniques(particularly Automatic Repeat reQuest (ARQ)) for all Group Of Picture (GOP) structures of standard video codecs in terms of efficient utilization of available WLAN channel data rates even at higher Bit Error Rates (BERs). Selective re-transmission events have been incorporated for inevitable part of video bit stream without causing a noticeable drop in objective or subjective media quality. Moreover, proposed error frame forwarding approach exhibits higher link saving even at higher BER with acceptable visual quality.