With rapid growth of digital communication in recent years, the need for high speed data transmission is increased. Moreover, future wireless systems are expected to support a wide range of services which includes video, data and voice. OFDM is a promising candidate for achieving high data rates in mobile environment, due to its resistance to ISI, which is a common problem found in high speed data communication. In OFDM, modulation may be differential or coherent. When using differential modulation there is no need for a channel estimate but its performance is inferior to the coherent system....

Although there has been much publicity about the Internet, research focusing on it is still relatively sparse. Much of the existent research on the internet has been predicated upon data collected in Europe and USA. To date, there is a dearth of published studies on the internet in the Asian context. This study examines gender differences in internet usage in Islamabad, Pakistan. Data were collected on internet users via a questionnaire survey. 100 usable responses were received, of which 68% were males and 32% were females. Gender differences in terms of the demographic profile of internet...

University instructors and administrators are continuously investing in Information Technology to support learning and help deal with educational budget cuts. Instructors are increasingly making their teaching materials available on the online educational forums. Administrators and instructors would like to make the Internet an effective educational tool. Students' attitudes towards using Internet as tool are also very essential. Many issues regarding its use have not been fully addressed. This research was conducted to provide a better understanding of how the Internet is used in university...