Adaptive OFDM_Orthogonal Frequency Dvision Multiplexing_2

Continuation on…BER Performance of OFDM System with Adaptive Modulation

*Channel Prediction of

Adaptive OFDMPresented by,Harish Rajula

P14EC009SV_National Institute of Technology

Surat.harish.rajula91@gmail.com

To be continue…….Effect of Channel Prediction on

Automatic Modulation Classification for Adaptive OFDM Systems…

Adaptive OFDM for Wireless Interconnect in Confined Enclosures…..

*CONTENTS

I. Introduction

II.Adaptive Techniques

III.Adaptive Subcarrier Allocation of OFDM

IV.Adaptive Modulation of OFDM

The transmitter selects the modulation modes of subcarriers and determines the Bit Allocation Table (BAT), the receiver should be informed of the BAT.

A common way is transmitting the BAT via signaling, which reduces the effective data rate. Alternatively, the receiver can attempt to estimate the BAT using an ADAPTIVE algorithm in order to avoid this signaling overhead.

I. INTRODUCTION

The Base station (BS) and the Mobile station (MS) transmit their data frame in downlink and uplink sequentially.

Each station estimates the channel transfer function using the

training sequence in each frame and determines the BAT of

the next transmission based on the estimated channel state

information (CSI). Intuitively, channel prediction can improve the modulation

classification performance by increasing the correlation

the two BATs at the transmitter and receiver

Assuming perfect synchronization and proper cyclic extension, the received symbol Y [k] on the n thsubcarrier of the k th OFDM symbol is,

*SYSTEM MODEL

2.Adaptive Techniques

Signalling the parameters

Signalling contd…,

I. Adaptive Subcarrier Allocation of OFDM

II. Adaptive Modulation of OFDM

To be Continue…,