vi LIST OF FIGURES viii ABBREVIATIONS ix Chapter-1: INTRODUCTION 1 1.1 OVERVIEW 1 1.2 LITERATURE SURVEY 3 1.3 MOTIVATION 4 1.4 STATEMENT OF PROBLEM 5 1.5 THESIS ORGANIZATION 6 Chapter-2: ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING 7 2.1 OVERVIEW OF OFDM SYSTEM 7 2.2 EFFECTS OF FREQUENCY SYNCHRONIZATION ERRORS IN OFDM 12 SYSTEM 2.3 OFDM MERITS, DEMERITS & APPLICATIONS 16 Chapter-3: ANALYSIS OF IN...

Orthogonal Frequency Division Multiplexing (OFDM) has been currently under intense research for broadband wireless transmission due to its robustness against multi-path fading. In multicarrier modulation, the most commonly used technique is OFDM, it has recently become very popular in wireless communication. The main drawback of OFDM is Peak to average power ratio (PAPR). This paper present sel...

Orthogonal Frequency Division Multiplexing (OFDM) is a well-known modulation technique for transmission of large amount of digital data with high data rate in both wired and wireless communication systems. High peak-to-average power ratio (PAPR) is the main problem of OFDM system which can be improved by using single carrier frequency division multiple access (SC-FDMA) technique. A new scheme u...

This paper aims to improve the error rate performance of enhanced spatial modulation based orthogonal frequency division multiplexing (ESM-OFDM) system by jointly optimizing signal constellation and antenna power allocation (PA). We derive a closed-form expression for optimal PA ESM-OFDM scheme some practical setups then implement verify using an Universal Software Radio Peripheral (USRP) platf...

For unmanned aerial vehicles (UAVs), high-precision measurement and high-speed communication are necessary to realize flight operational missions. In this paper, we propose an integrated system in a Doppler frequency offset environment. The combines orthogonal division multiplexing (OFDM) modulation with binary carrier (BOC) formulate OFDM+BOC composite signal through power control. High-precis...

In this paper, we describe a approach for reducing the power consumption and complexity of a multiband orthogonal frequency division multiplexing (MB-OFDM) for ultra wideband (UWB) system by applying ideas from pulsed UWB systems. The approach is quite general and applicable to many other systems. Unlike the MB-OFDM system, the enhancement that we propose uses pulses with duty cycles of less th...

In this paper we describe a coding, modulation, and spatial processing technique for fixed broadband wireless Internet access applications and provide examples of its performance. This technique is built on Orthogonal Frequency Division Multiplexing (OFDM) and is known as Vector OFDM (VOFDM). We compare VOFDM with conventional Single Carrier Modulation (SCM), and show that it provides substanti...

We proposed a novel rate-1, space-frequency (SF) code for an Orthogonal Frequencey Division Multiplexing (OFDM) system with transmit (M ) and receive (N ) antennas that achieves the maximum diversity attainable over frequencyselective channels. Since the SF code symbol is transmitted in one OFDM block duration, it has smaller processing delay than previously proposed Space-Time-Frequency (STF) ...

In orthogonal frequency-division multiplexing (OFDM) systems, synchronization issues are of great importance since synchronization errors might destroy the orthogonality among all subcarriers and, therefore, introduce intercarrier interference (ICI) and intersymbol interference (ISI). Several schemes of frequency offset estimation in OFDM systems have been investigated. This paper compares perf...

This paper suggests parameter estimation and error reduction scheme in a multicarrier transmission system. A multicarrier orthogonal frequency division multiplexing (OFDM) signal by using a time-domain spreading (TDS) coupled with a cyclic time shift enables a pilot-less synchronization. Exploiting the modified OFDM signal endowed with the TDS, the proposed synchronization receiver can accurate...