Adaptive OFDM_Orthogonal Frequency Dvision Multiplexing_ Continuation part_2

1. Continuation on…BER Performance of OFDM
System with Adaptive Modulation
*
Presented by,
Harish Rajula
P14EC009
SV_National Institute of Technology
Surat.
harish.rajula91@gmail.com

2. Effect of Channel Prediction on
Automatic Modulation Classification
for Adaptive OFDM Systems…
 Adaptive OFDM for Wireless Interconnect
in Confined Enclosures…..

3. *
I. Introduction
II.Adaptive Techniques
III.Adaptive Subcarrier Allocation of OFDM
IV.Adaptive Modulation of OFDM

4. 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.

5. 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

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

7. *

12. I. Adaptive Subcarrier Allocation of OFDM
II. Adaptive Modulation of OFDM