Comparison of two FFT structures for fractionally-spaced frequency domain equalizer

Author

Ryu, Jae-Ho ; Lee, Yong-Hwan ; Lee, Kwang-Bok

Author_Institution

Sch. of Electr. Eng., Seoul Nat. Univ., South Korea

Volume

4

fYear

2002

fDate

6/24/1905 12:00:00 AM

Firstpage

1710

Abstract

A fractionally-spaced frequency domain equalizer (FS-FDE) is needed to transform a received signal into the frequency domain. We consider two fast Fourier transform (FFT) schemes, one with a single 2N-point FFT and one with two N-point FFTs, for the transform of oversampled N symbol data in the FS-FDE receiver. It is shown that the two receiver schemes are equivalent in terms of the characteristics of the FFT output, per-bin SNR after maximum-ratio combining, computational complexity and the residual out-of-band noise rejection property. These properties are verified by computer simulation in additive white Gaussian noise (AWGN) and typical multipath channel.

Keywords

AWGN channels; computational complexity; equalisers; fast Fourier transforms; frequency-domain analysis; interference suppression; multipath channels; radio receivers; AWGN channel; FFT structures; additive white Gaussian noise; computational complexity; fast Fourier transform; fractionally-spaced frequency domain equalizer; maximum-ratio combining; multipath channel; per-bin SNR; radio channel; residual out-of-band noise rejection; AWGN; Additive white noise; Computational complexity; Computer simulation; Equalizers; Fast Fourier transforms; Flexible printed circuits; Frequency domain analysis; Gaussian noise; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2002. VTC Spring 2002. IEEE 55th

Print_ISBN

0-7803-7484-3

Type

conf

DOI

10.1109/VTC.2002.1002912

Filename

1002912