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Spectral Efficiency Improvement of OFDM by Using Time Domain Superimposition of Data

JunKyoung LEE, JangHoon YANG, DongKu KIM

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Summary :

A scheme of the superimposing additional data signal in the time domain for orthogonal frequency division multiplexing (OFDM) system is proposed. The proposed scheme has a tradeoff between the degree of freedom for data transmission and inter-carrier interference (ICI), which provides the flexibility of data rate decision when the finite number of modulation and coding levels are available for the given channel condition. A performance analysis of the bit error rate (BER) confirms this tradeoff. In simulation on the practical environment which experiences multipath fading and error of channel estimation, the results show that much improvement of spectral efficiency has been achieved while keeping as nearly good bit error rate as the conventional OFDM. Moreover, the single carrier transmission of the superimposed additional data in the time domain also gives an opportunity of boosting the signal power up to the peak to average power ratio (PAPR) margin of the OFDM system.

Publication
IEICE TRANSACTIONS on Communications Vol.E91-B No.10 pp.3355-3359
Publication Date
2008/10/01
Publicized
Online ISSN
1745-1345
DOI
10.1093/ietcom/e91-b.10.3355
Type of Manuscript
LETTER
Category
Wireless Communication Technologies

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