پتھریلے شہر
میں شام کی اداس پگڈنڈی پر دن بھر کے تھکے سورج کی مانند بیٹھا تھا
’’کیوں ‘‘۔۔۔۔۔ ’’کس لیے‘‘
میں اپنے وجود کی نفی کے بارے میں سوچ رہا تھا
منتشر خیالات کا سیلِ رواں رگوں میں محو ِ گردش تھا
ذہن تاریک جھونپڑے کی مانند آزاردہ تھا
شوریدہ سری میری بینائی نگل چکی تھی
میں تصورات کے پتھروںسے ٹھوکریں کھاتا ہوا
اس جھونپڑے میں جا پہنچا جہاں کبھی زندگی ہار دی تھی
اچانک ایک ٹھوکر سے بینائی بحال ہو گئی
Allah Almighty, with his power, created the sky, earth and whole universe and provided all the necessities. Therefore, the work of preaching Islam is conferred upon the Ummah of Holy Prophet (P.B.U.H). There are the people who had been taught the teachings of Islam directly by Holy Prophet and they preached Islam in the same way as they were taught. They practiced all the teachings in their lives. Sahaba R.A, for preaching Islam, went to the east, west, north, south, Hind, Sindh and the corners of the world. As a result of their efforts, almost half of the world got the message of Islam. Tabaeen consisted of many people, in the light of Quran and Sunnah, conveyed the message of Islam throughout the world. In the same way, another group of people named Tab Tabaeen became prepared to spread the universal message of Islam. They didn't ignore any sacrifice to uplift the spirit of Islam. With their struggle, many great people like saints, jurist, reader and interpreter of Quran and Hadith born. These people tried their best to convey the message of Islam through written and spoken discourse. Religious books and places were introduced. That process of education, after many years, is still continuing. Presently, many religious places are constructed to preach spiritual guidance in which many great scholars and saints are engaged. History is witness that opponents went to extent possible level to aloof Muslims from teaching, preaching and guiding of lslam. Not only were this but the Muslims intended to end also. In these trials and tribulations, saints took responsibility on their shoulders and continued their struggle on the directed path of oneness, Prophet hood, Ahle Bait and Sahabas against the evil forces. Among such great Family of Pir Pagara is one whose line is continuing in Hind and Sindh. Insha Allah (If God wills) it'll continue till the last day. There is his great religious and social contribution. To convey, his valiant services towards people, research on this personality is dire need of the hour. In history, this research will be advantageous for the researchers to come.
The size and complexity of wireless communication networks have grown tremendously over the last few decades. Analysis of a wireless communication system requires computer simulations of the entire communication network, spanning multiple cells with a large number of base stations and mobile terminals. This normally involves complex physical layer computations in order to evaluate the receiver performance with the transmitted signals subjected to interference, multipath propagation, and shadowing. Link to system (L2S) interfacing reduces the computational complexity associated with the physical layer performance evaluation of multiple communication links by predicting the receiver behavior under different channel conditions using precalculated lookup tables (LUTs). This thesis investigates the L2S interfacing for different advanced receiver strategies using various nonlinear mapping functions. Different transmission scenarios such as single input single output, single input multiple output, and multiple input multiple output are considered. Besides using the conventional AWGN channel performance as the reference LUT, the mean of different channel frame error performance is also suggested as reference and the prediction accuracy of both have been compared. L2S framework has been implemented using the post detection signal to noise ratio (SNR) values as the received signal quality measure. The existing L2S work for SISO, linear MIMO systems has been extended to iterative and maximum likelihood receivers, where finding an accurate estimate of the received signal quality which is highly correlated to the receiver output is an open problem and needs to be fully explored. Algorithms for the post detection SNR value estimation for iterative and maximum likelihood receivers have been proposed and their prediction performance is validated for diverse communication channels. It is shown that, the post detection SNR value is an accurate measure of the quality of the received signal. However, for MIMO system with single stream encoding, the accurate estimation of the post detection SNR value for each individual link is not essential, but rather an accurate average value over multiple links is found to be sufficient.