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...

We develop adaptive channel estimation techniques for space–time block–coded (STBC) multiple–input multiple– output (MIMO) orthogonal frequency division multiplexing (OFDM) communications. The structure of the space–time code is exploited to lower the complexity of the adaptive receiver.

Maximum spatial-frequency diversity can be achieve by combining bit-interleaved coded modulation (BICM), orthogonal space-time block coding (OSTBC) and orthogonal frequency division multiplexing (OFDM) in frequency selective multi-path fading channels, provided that perfect channel state information (CSI) is available to the receiver. In view of the fact that perfect CSI can be obtained only if...

Orthogonal Frequency Division Multiplexing (OFDM) has the inherent properties of being robust to interference and frequency selective fading and is de facto the adopted multiplexing techniques for the 4 th generation wireless network systems. In wireless system, resources such as bandwidth and power are limited, intelligent allocation of these resources to users are crucial for delivering the b...

Efficient utilization of the spectrum is the key challenges is multiplexing technology, and have OFDM is a transmission technique which ensures efficient utilization of the spectrum by allowing overlap of the spectrum by allowing overlap of carriers. It has various advantages like high spectral density, its robustness to channel fading, its ability to overcome several radio impairment factor su...

Orthogonal frequency division multiplexing (OFDM) is an attractive, promising and emerging technique which achieves high data rate in mobile multipath channels. LTE was the first technology to use OFDM. There are many more advantages of OFDM which includes immunity to multipath fading. High Peak to Average Power Ratio(PAPR) is the main disadvantage of OFDM-LTE Networks. This paper describes how...

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...

The orthogonal frequency division multiplexing is used in wireless communication due to high data rate. OFDM are robustness against multi-path fading, frequency selective fading, and narrow band interference. Wavelet analysis has strong advantages over fourier transform and also allows time-frequency domain operation with flexibility. Wavelet is applied in various fields of wireless communicati...

Super-orthogonal and super-quasi-orthogonal space-time trellis coding is seamlessly combined with orthogonal frequency division multiplexing (OFDM) to improve the performance of broadband wireless mobile communication systems. Quadrature amplitude modulation (QAM) is used on all OFDM subchannels. The transmitter is equipped with two antennas when using super-orthogonal space-time trellis codes ...

Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation scheme that provides efficient bandwidth utilization and robustness against time dispersive channels. This paper deals with the basic system model for OFDM based systems and with self-interference, or the corruption of desired signal by itself in OFDM systems. A simple transceiver based on OFDM modulation is present...