Document Type : Research Paper
1 Department of Electrical Engineering, Marvdasht branch, Islamic Azad University, Marvdasht, I. R. Iran.
2 Advanced Device Simulation Lab, Electrical and Computer Engineering Department, Tarbiat Modares University, I. R. Iran
3 Electrical Engineering Department, Shiraz University, Shiraz, I. R. Iran
4 Iran Telecommunication Research Center, Tehran, I. R. Iran