Notice of Violation of IEEE Publication PrinciplesAdaptive OFDM Vs Single Carrier Modulation with Frequency Domain Equalization

Notice of Violation of IEEE Publication Principles

"Adaptive OFDM Vs Single Carrier Modulation with Frequency Domain Equalization,"
by K. Inderjeet, T. Kamal, M. Kulkarni, G. Daya, A. Prabhjyot
in the Proceedings of the International Conference on Computer Engineering and Technology, 2009. ICCET \´09. Vol.1, pp.238-242, January 2009

After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE\´s Publication Principles.

This paper contains significant portions of original text from the paper cited below. The original text was copied without attribution (including appropriate references to the original author(s) and/or paper title) and without permission. The lead author, K. Inderjeet, was solely responsible for the violation.

Due to the nature of this violation, reasonable effort should be made to remove all past references to this paper, and future references should be made to the following article:

"Comparison Between Adaptive OFDM and Single Carrier Modulation with Frequency Domain Equalization,"
by A. Czylwik
in the Proceedings of the IEEE 47th Vehicular Technology Conference, 1997, vol.2, pp. 865-869, May 1997

The aim of the present paper is to compare multicarrier and single carrier modulation schemes for wireless communication systems. In both cases the fast Fourier transform (FFT) and its inverse are utilized. In case of OFDM (orthogonal frequency division multiplexing), the inverse FFT transforms the complex amplitudes of the individual subcarriers at the transmitter into time domain. At the receiver the inverse operation is carried out. In case of single carrier modulation, the FFT and its inverse are used at the input and output of the frequency domain equalizer in the receiver. Different single carrier and multi-carrier transmission systems are simulated with time-variant transfer functions - measured with a wideband channel sounder. In case of OFDM, the individual sub-carriers are modulated with fixed and adaptive signal alphabets. Furthermore, a frequency-independent as well as the optimum power distribution are used. Single carrier modulation uses a single carrier, instead of the hundreds or thousands typically used in OFDM, so the peak-to-average transmitted power ratio for single carrier modulated signals is smaller. This in turn means that a SC system requires a smaller linear range to support a given average power. This enables the use of cheaper power amplifier as compared to OFDM system.