presented by:
Rahul Singh
Nafisur Rahman


Intercarrier Interference Compression in OFDM Communication Systems by Using Correlative Coding
1. Orthogonal Frequency Division Multiplexing(OFDM)
1.1 Introduction
Over the past few years , there has been increasing number of users of mobile/movable non wired communication than wired communication system. At present, in addition to voice services only low bit data rate are available to mobile users. The mobile radio channel is characterized by multipath reception ....etc

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ABSTRACT

OFDM (Orthogonal Frequency Division Multiplexing) is a modulation and multiple access technique that has been explored for over 20 years. Only recently has it been finding its way into commercial communications systems. OFDM, or multitone modulation, is presently used in a number of commercial wired and wireless applications. In order for any mobile system to create a rich user experience, it must provide ubiquitous, fast and user-friendly connectivity. OFDM has several unique properties that make it especially well suited to handle ....etc

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ABSTRACT
Orthogonal frequency Division Multiplexing (OFDM) is
multicarrier transmission technique. OFDM is a communication technique
that divides the communication channel into a number of equally spaced
frequency bands. A sub carriers a portion of the users information in
each band. Each sub carriers is orthogonal (Independent of each other)
with every other sub carrier. OFDM efficiently squeezes multiple
modulated carriers tightly together reducing the required bandwidth.
OFDM was invested in 1960â„ ....etc

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CODE DIVISION DUPLEXING

Abstract

Reducing interference in a cellular system is the most effective approach to increasing radio capacity and transmission data rate in the wireless environment. Therefore, reducing interference is a difficult and important challenge in wireless communications. In every two-way communication system it is necessary to use separate channels to transmit information in each direction. This is called duplexing. Currently there exist only two duplexing technologies in wireless communications, Frequency division dup ....etc

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CDMA Technology

Abstract :

CDMA was developed by QUALCOMM Incorporated, a company in San Diego, California. QUALCOMM engineers decided to do something different and applied spread spectrum techniques to a multiple access system, which ultimately became CDMA.
In spread spectrum, instead of giving each person a channel, or each group of 3 or 8 people a time slot, CDMA puts everyone in the same channel at the same time.
At first thought, it would seem to be an impossible task to make work, but it does work. The reason it works is expla ....etc

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ABSTRACT

OFDM (Orthogonal Frequency Division Multiplexing) is a modulation and multiple access technique that has been explored for over 20 years. Only recently has it been finding its way into commercial communications systems. OFDM, or multitone modulation, is presently used in a number of commercial wired and wireless applications. In order for any mobile system to create a rich user experience, it must provide ubiquitous, fast and user-friendly connectivity. OFDM has several unique properties that make it especially well suited to handle ....etc

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PREFACE

The DSP world today is ruled by different transforms. Discrete Fourier transforms are most used. So is the fast Fourier transform, which is the faster version of DFT.
Suppose we take FFT of a signal. On taking the inverse fast Fourier transform,we except the output to be the same as the input.This is called the invertibility property.But on most occasions, dissapointment is the result. This is due to the finite word length of the registers used to store the samples and the coefficients.
This seminar introduces a method called integ ....etc

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CDMA Technology

Abstract :

CDMA was developed by QUALCOMM Incorporated, a company in San Diego, California. QUALCOMM engineers decided to do something different and applied spread spectrum techniques to a multiple access system, which ultimately became CDMA.
In spread spectrum, instead of giving each person a channel, or each group of 3 or 8 people a time slot, CDMA puts everyone in the same channel at the same time.
At first thought, it would seem to be an impossible task to make work, but it does work. The reason it works is expla ....etc

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ABSTRACT:

OFDM
otherwise called orthogonal frequency division multiplexing is a modulation and a multiple access technique that can be applied to mobile communications.
OFDM or Multitone modulation as it is sometimes called is the basis for several commercial wireless applications. In OFDM the segments are according to frequency there by dividing the spectrum into a number of equally spaced tones, which are orthogonal with each other and carries a portion of user information ....etc

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OFDM Project

Abstract
This report discusses the design and implementation of an OFDM modem for a simplex communication
between two PCs over a frequency selective channel. First a brief introduction is
provided by explaining the backrground and the specification of the project. Then the report
deals with the system model. Each block of the OFDM system is described (IFFT/FFT, cyclic
prefix, modulation/demodulation, channel estimation, bit loading). In the following section, the
system architecture is analysed. The transmiss ....etc

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