An Introduction to Adaptive QAM Modulation Schemes for Known and Predicted Channels
ABSTRACT | A major disadvantage with fixed modulation (nonadaptive) on channels with varying signal-to-noise ratio (SNR) is that the bit-error-rate (BER) probability performance is changing with the channel quality. Most applications require a certain maximum BER and there is normally no reason for providing a smaller BER than required. An adaptive modulation scheme, on the contrary, can be designed to have a BER which is constant for all channel SNRs. The spectral efficiency of the f...
A Novel Mobile WiMAX Solution for Higher Throughput
Abstract— The IEEE 802.16 standard, also known as WiMAX, has emerged as an exciting technology for broadband wireless communications with potentials to offer high throughput and support high bandwidth demanding applications. WiMAX, however, has yet to prove its effectiveness when the end terminals are not fixed and have the capacity to move from one place to another at different speeds. Recent studies suggest that while WiMAX (802.16e) has the potential to deliver a data rate up to 75 Mb/s ...
PL/SQL Tutorial
Table of Contents PL/SQL Overview ..................................................................... 1 Features of PL/SQL ................................................................................... 1 Advantages of PL/SQL .............................................................................. 2 Environment ............................................................................. 3 Step 1 ........................................................................................
Adaptive modulation for cognitive radios
TABLE OF CONTENTS Page ABSTRACT ……………………………………………………………………………..iii ACKNOWLEDGEMENTS……..………………………………………………………..iv LIST OF ILLUSTRATIONS………………………………………………………….…vii SECTION 1. INTRODUCTION……………………………………………………….…….1 2. DEFINITION OF A COGNITIVE RADIO………………..…….……………4 3. OPERATIO...
IMPACT AND APPLICATION OF NANOTECHNOLOGY IN MEDICINE
INTRODUCTION TO NANOTECHNOLOGY Nanotechnology has gained ground in the twenty-first century and is rapidly growing due to the ability to manipulate and harness properties of assemblies that are at the nanosize scale of biomolecules. Bionanotechnology is defined by science’s growing ability to work at the molecular level, atom by atom, combining biological materials and the rules of physics, chemistry and genetics to create tiny synthetic structures [1]. The end result of nanotechnology...
A TECHNICAL REPORT ON POTENTIALS AND DRAWBACKS OF SOLAR ENERGY AS A SUSTAINABLE ALTERNATIVE ENERGY SOURCE FOR NIGERIA
ABSTRACT The paper discusses the solar energy potentials and drawbacks as sustainable alternative energy source for Nigeria, the numerous issues involved in harnessing solar energy and clearly articulates a road map to enable Nigeria tap into this huge potential. Research indicate that, Nigeria lying in the tropics, receives abundant sunshine where about 1500PJ (about 258 million barrels of oil equivalent) could be available to Nigeria annually from solar energy if solar appliances with 5% c...
THE IMPLEMENTATION OF ADAPTIVE MODULATION IN REDUCING BIT ERROR RATE USING MATLAB AND FUZZY LOGIC MODELLING
ABSTRACT In our present society, wireless communication has become most prevalent and mobile units (hand held devices /GSM/ Computers) are one of the most common equipments for conveying messages wirelessly. Owing to the fact that most youths in our society today on the average make use of at least one wireless device that communicate with other wireless devices via the internet, has made engineers start to think about ways to improve the quality of service (QOS), throughput, spectral effic...
THE IMPLEMENTATION OF ADAPTIVE MODULATION USING MATLAB AND FUZZY LOGIC INTERFACE SYSTEM
ABSTRACT The rapid growth in the use of wireless communication in mobile network devices has made many engineers and researchers to start to look into ways to enhance data transmission either in form of voice, text, data, streaming multimedia, internet etc. Wireless Services that occur in real time require very little or no bit error during transmission in order for the receiver to get an intelligible information from the transmitting station. Whereas some services require more data to be tra...
DESIGN AND IMPLEMENTATION OF A CLOUD-BASED MOBILE LEARNING PLATFORM
ABSTRACT Mobile computing involves the use of portable handheld devices having network connections to access online resources especially via the internet. With mobile computing, people can collaborate from various distant location, they can be involved in conferences, online forums, symposiums, etc. One of such important services offered by mobile computing is Mobile learning. Mobile learning or M-learning has been realized as a convenient, efficient and effective way of learning. However, wi...