2005/1/28 Seminar

Student ： Future Master CCY

Advisor ： Doctor Yung An Kao

Outlines• Introduction

• Case Discussion

• Simulation

• Conclusion

Introduction

Case Discussion(1)

We have found that there is a large error in

SFO estimation. WHY???

We take the following example to find out th-

e problem.

Environment:Trms, Ts=50; CFO=0.01;

SFO=500Hz

Case Discussion(2)

In this simulation, we used the 23th and 24th

sub-carrier which have MAX signal energy.

However, we would get a wrong estimation-

330 symbol.

Case Discussion(3)23th and 24th sub-carrier

Case Discussion(4)23th and 16th sub-carrier

Case Discussion(5)23th and -16th sub-carrier

Simulation Environment

• SNR=20dB

• 600 OFDM symbol, 1200 times

• SFO=500; CFO=0.01

• No channel (each sub-carrier is equal energy)

• We used the 26th and -26th sub-carrier in first figure. In second figure, we used the -26th and -25th sub-carrier.

Simulation

Simulation

Conclusion

• We should use the sub-carriers that are not adjacent.

• We could not only select the sub-carriers that have MAX signal power.