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Continuation on…BER Performance of OFDM System with Adaptive Modulation
*Channel Prediction of
Adaptive OFDMPresented by,Harish Rajula
P14EC009SV_National Institute of Technology
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…,