NDLI: A new turbo-coded OFDM system using orthogonal code multiplexing

Content Provider	IEEE Xplore Digital Library
Author	Bang Chul Jung Myung Hoon Sunwoo Seong Keun Oh
Copyright Year	2002
Description	Author affiliation: Sch. of Electron. Eng., Ajou Univ., Suwon, South Korea (Bang Chul Jung; Myung Hoon Sunwoo; Seong Keun Oh)
Abstract	In this paper, we propose a new transmission scheme that can improve greatly the performance of turbo-coded orthogonal frequency division multiplexing (OFDM) systems by making all the turbo-coded symbols have the same reliability for OFDM transmission over a frequency selective fading channel. The same reliability, that is, the same fading can be accomplished through multiplexing of turbo-coded symbols using distinct orthogonal codes and spreading over the whole effective subcarriers (hereafter, called the orthogonal code multiplexing (OCM)). This idea of the same fading for all symbols is the key of the performance improvement using the proposed scheme. As for the orthogonal code selection, a set of Walsh codes could be the best selection in terms of the complexity. However, in the fast Fourier transform (FFT) implementation of OFDM, the number of the whole effective subcarriers may be slightly less than the number of FFT points used. Hence, we choose the set of the discrete Fourier transform (DFT) basis sequences as a good substitute for a set of orthogonal codes, since the code set can hold the orthogonality irrespective of the length. We perform computer simulations using the log-maximum-a-posteriori (log-MAP) algorithm for iterative decoding in order to assess the performance of the proposed system and to compare it with that of the conventional turbo-coded OFDM system.
Starting Page	1448
Ending Page	1451
File Size	345696
Page Count	4
File Format	PDF
ISBN	0780374843
DOI	10.1109/VTC.2002.1002856
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-05-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Turbo codes Fading AWGN Iterative decoding Intersymbol interference Reliability engineering Fast Fourier transforms Discrete Fourier transforms Computer simulation
Content Type	Text
Resource Type	Article

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