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Multidimensional Waveform Shaping In Multicarrier Systems, Ertugrul Guvenkaya
Multidimensional Waveform Shaping In Multicarrier Systems, Ertugrul Guvenkaya
USF Tampa Graduate Theses and Dissertations
Constantly increasing demand for wireless communications in various applications has always led to new ways of modulating the radio frequency (RF) carrier signal by advancing waveform structure throughout generations. Although communication data rates are limited by the theoretical capacity, specific signaling designs for the signal that experiences natural and artificial effects in the transmission medium such as multipath fading channel, hardware impairments and multiuser environment promised better solutions in providing improved wireless access to various type of users and networks. Besides communication capacity, broadcasting nature of radio signals poses the information security as another main concern in wireless communications. In …
Physical Layer Algorithms For Interference Reduction In Ofdm-Based Cognitive Radio Systems, Anas Tom
Physical Layer Algorithms For Interference Reduction In Ofdm-Based Cognitive Radio Systems, Anas Tom
USF Tampa Graduate Theses and Dissertations
Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier transmission scheme used in most of the existing wireless standards such as LTE, WiFi and WiMAX. The popularity of OFDM stems from the multitude of benefits it offers in terms of providing high data rate transmission, robustness against multipath fading and ease of implementation. Additionally, OFDM signals are agile in the sense that any subcarrier can be switched on or off to fit the available transmission bandwidth, which makes it well suited for systems with dynamic spectrum access such as cognitive radio systems. Nonetheless, and despite all the aforementioned advantages, OFDM signals …