Design and Implementation of FFT/IFFT Processor for OFDM Systems
Date Issued
2009
Date
2009
Author(s)
Pan, Chien-Wen
Abstract
The life attains much convenience with the advanced communication technology in recent years, among which the system named Orthogonal Frequency Division Multiplexing (OFDM) is extensively put in use in wired and wireless local area network such as ADSL, Wimax, 3G, 4G and so on. The fact is resulted not only from the advantages in OFDM systems which can effectively reduce inter-carrier interference (ICI) and inter-symbol interference (ISI) caused by multipath effect, but also from improving the utilization of channel, and the FFT/IFFT is a core of OFDM technique. Therefore, we designed and implemented a FFT/IFFT processor in this thesis. According to the different perspectives of the applications needing the specific OFDM systems, they use different FFT points. The requirements of the area and hardware in chip will increase caused by FFT size. Because of this thesis is the first one of DSP chips in our Lab, we use FFT 64 points to design and implement. We adopted radix-2/4/8 algorithm and pipeline-based SDF architecture to reduce the complexity of computation and the requirements of hardware. The FFT/IFFT processor was implemented by TSMC 0.35μm 2P4M CMOS process in this thesis, and through the measurements we got the same results between simulations and measurements.
Subjects
OFDM
FFT
pipeline
radix-2/4/8
Type
thesis
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