1. Methods of modulation and demodulation in OFDM system: implement and analysis for BER performance, hardware performance, and hardware complexity
Hsin-Yu Chen

2. outline Motivation Goal Introduction: 1. IDFT/DFT in OFDM
2. IDHT/DHT, IDWT/DWT in OFDM
Approach
Conclusion

3. motivation Curious about the function of IDFT/DFT in OFDM system
No exhaustive comparison among these three
structures with their BER performance and
hardware complexity

4. Goal To find more complete information among all three structures
Expect to find the structure, if any, which
generates the best result

5. Introduction TX RX OFDM block diagram: P/S S/P P/S S/P
Add CP
Digital modulation
IDFT
P/S
S/P
Channel RX
Digital demodulation
Remove CP
P/S
DFT
S/P

6. introduction IDFT/DFT: Modulation/Demodulation Orthogonal IDHT/DHT:
Real-valued arithmetic
Identical inverse
IDWT/DWT:
do not need to add CP

7. Approach Using MATLAB to proof that IDFT/DFT can be
replaced by IDHT/DHT and IDWT/DWT
Adding AWGN noise and channel effect in
OFDM system, calculate the BER
performance

8. conclusion
BER

9. conclusion IDHT/DHT Approximately same BER performance as IDFT/DFT
Lower hardware complexity
Lower hardware performance
IDWT/DWT
Higher BER performance than IDFT/DFT