دیباچہ
کاشف علی
پروفیسر ڈاکٹر محمد ایوب اردو تحقیق و تنقید میں ایک نیا اضافہ ہیں۔اس سے قبل وہ پنجابی ادب میں اپنی صلاحیتوں کے جوہر دکھا چکے ہیں۔پنجابی حلقہ ادب میں آپ کا نام کسی تعارف کا محتاج نہیں۔حالیہ چند عرصوں میں انہوں نے اردو ادب کے میدان میں قدم رکھا اور اپنی صلاحیتوں کو بروئے کار لاتے ہوئے اردو ادب میں اپنی پہلی کتاب لکھ ڈالی۔اس کتاب میں شامل بیشتر مضامین ہماری معاشرتی زندگی سے جڑے ہوئے ہیں جس سے یہ بات واضح ہوتی ہے کہ ڈاکٹر محمد ایوب اپنے اردگرد کے معاشرتی حالات پر گہری نظر رکھتے ہیں۔ان مضامین کا مواد اپنے مجموعی مزاج میں پر اعتماد فکری فضا اور گہری وسعت نظر کا حامل ہے۔نبی کریمﷺکی ذات سے والہانہ عقیدت و محبت کا اظہار ان کے مضامین میں ملتا ہے۔انہوں نے نے نئے نعتیہ اشعار کہنے والے شعراء حضرات کی اصلاح بھی کی ہے۔اس کے علاوہ انہوں نے نام نہاد مذہبی پیشواؤں کو بھی آڑے ہاتھوں لیا ہے جو مذہب کو اپنے مفاد کیلئے استعمال کرتے ہیں اور بہت سے معاشرتی مسائل پر بھی نظر دوڑائی ہے۔ انہوں نے پنجاب کی تہذیب و ثقافت کو ادب میں زندہ رکھنے کے حوالے سے بھی اپنا کردار ادا کیا ہے۔ جملہ مضامین سے یہ بات پورے وثوق سے کہی جا سکتی ہے کہ ڈاکٹر محمد ایوب کا نقطہ نظر ایک مثبت طرز فکر کا حامل ہے۔انہوں نے اپنے مضامین میں نہایت سادہ الفاظ کا انتخاب کیا ہے جس سے معاشرے کی اصلاح ممکن ہے۔مجھے یقین ہے وقت کے ساتھ ساتھ پنجابی کی طرح اْردو ادب میں بھی ان کی اہمیت میں گراں قدر اضافہ ہوگا۔
کتاب میں موجود تمام مضامین اردو ادب سے تعلق رکھتے ہیں جو کہ اس سلسلے میں ان کی پہلی...
Muslims are a unique nation in the world who have shown unparalleled activism in preserving their sayings and relics. Caution was in view from day one. The simple precautionary measures taken in the early days later took the form of theology. In the beginning, the principles and rules of this knowledge did not exist in a disciplined form, although the scholars of Muḥaddithin adhered to the basic principles of this knowledge from the very beginning. However, references to these principles were to be found in the books of the pious. In the 4th Hijri, the scholars of Muhaddithin compiled the previous scattered work on the art of the principle of Ḥadith. Now these comprehensive definitions and terms are before us in a systematic and disciplined form in the books of ‘Usūl e Ḥadīth. In this short essay, the definition and necessity and importance of Hadith and ‘Usūl e Ḥadīth have been highlighted and also an introductory review of books written on ‘Usūl e Ḥadīth th and their authors and authors has been presented. Which indicates this. How strict were the rules and regulations of the Muslim Ummah for examining the authenticity and text of the Holy Hadith and how did they separate the authentic, weak and subject matter of the hadiths and write their separate books? And how hard they have worked to promote art.
Automatic Modulation Classification (AMC) is a scheme to classify the modulated signal by observing its received signal features. The received signal is usually corrupted by influence of various sources, such as, white guassian noise and fading, which degrades the signal quality. Automatic modulation classification plays an important role in cognitive radio communication. Due to amassed usage of digital signals in different technologies, such as, cognitive radios, scientists have focused on recognizing these signal types. AMC is expected to be incorporated in the upcoming cognitive communication. Generally, digital signal type classification can be categorized into two major categories: decision theoretic (DT) methods and pattern classification (PC) methods. In this research we focused on PC methods which are based upon features extraction. The feature extraction based modulation classification is accomplished in two modules. The first module is the feature extraction and second is classification process which gives decision based upon the features extracted. The features extracted from the received signal are higher order moments, higher order cummulants, spectral features, cyclo-stationary features and novel Gabor features. The classification of digital modulation formats such as pulse amplitude modulation (PAM), quadrature amplitude modulation (QAM) and phase shift keying (PSK) and frequency shift keying (FSK) are considered throughout the research. The performance of proposed classifier are analyzed on additive white guassian noise channel (AWGN), Rayleigh flat fading channel, Rician flat fading channel and log normal fading channel. The proposed classifier algorithm for classification of different unknown modulated signals is based on normalized higher even order cummulants features and spectral features. The proposed classifiers are based on likelihood function, vi multilayer perceptron and linear discriminant analysis. The simulation results show that the proposed algorithms have high classification accuracy even at low signal to noise ratio (SNR). The proposed classifier algorithms perform efficiently as compared to the existing classifiers. A novel joint feature extraction and classification technique is proposed to classify the digital modulated signals by adaptively tuning the parameters of Gabor filter network. The Gabor atom parameters are tuned using delta rule and weights of the Gabor filter using least mean square (LMS) algorithm. The proposed algorithm classifies efficiently the PSK, FSK and QAM signals with 100% classification. The Modified gabor filter network is proposed for classification of M-PAM signals. The proposed HMM and Gabor filter network formulates an optimal classifier structure. The proposed classifier use Baum-Welch algorithm and Genetic algorithm (GA) to update the Gabor filter network and hidden markov model (HMM) parameters. The fitness function for the genetic algorithm is probability of observation sequence given the model. The objective is to maximize the probability of observation sequence. To improve the classification accuracy, three parameters of Gabor filters (GFs) network and one HMM parameter are adjusted simultaneously such that the probability of observation sequence is maximized. The proposed classifiers are compared with well-known techniques in the literature and simulation results show the supremacy of the proposed schemes over the contemporary techniques.