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A new approach of an optimal 16-QAM modulation has been introduced to be used for both Fourier and wavelet based OFDM. The comparison between circular and square 16-QAM is included. It is shown that the power consumption of circular is better than the square by 0.5359 W or -2.71 dB for the same minimum distance 2d. Simulation works for Fourier and wavelet based OFDM have been performed. In Fourier...
In this paper, we evaluate the performance of broadcast safety applications in a vehicular-to-vehicular (V2V) communication scenario using a BER-based reception model from a detailed IEEE 802.11p physical layer simulator for a more accurate interpretation of the vehicular communication system, instead of the prebuilt SNR threshold model available in a typical network simulators. Our main contribution...
Multiple-Input Multiple-Output (MIMO) antennas and Multi-Carrier Code Division Multiple Access (MC-CDMA) are very promising candidates for simultaneous utilize in 4G systems, since they attain robustness, high spectral efficiency, and high data rates in rich scattering environments. This paper proposes an efficient hybrid detection algorithm for downlink MC-CDMA system based on Orthogonal Frequency...
Facial expression recognition (FER) has attracted significant interest in the scientific community due to its importance for human centred interfaces. This study compare the effect of different modulation for person-independent facial expression recognition from face images. The image is transmitted based on wavelet based OFDM channel. Then, the higher order local autocorrelation (HLAC) is used for...
Facial expression recognition (FER) has attracted significant interest in the scientific community due to its importance for human centred interfaces. This study compare the effect of different modulation for person-independent facial expression recognition from face images. The image is transmitted based on OFDM channel. Then, The higher order local autocorrelation (HLAC) is used for feature extraction...
In this paper, we have derived the circular 16-QAM constellation and apply it in Fourier and wavelet based OFDM systems. In order to derive the circular scheme, we first begin with the derivation of the square scheme as the scale of measurement for the purpose of comparisons. It is found out that the power consumption of the circular constellations is lower than the square signals by -2.71dB for a...
We present a comparative study on Fourier-based OFDM (FFT-OFDM) and wavelet-based OFDM (DWT-OFDM) in DVB-T system (DWT being the discrete wavelet transform).We found that the DWT-OFDM outperforms FFT-OFDM in AWGN and Rayleigh fading channels. For AWGN channel, the gain in term of energy per bit to noise ratio Eb/No was improved by about 5 dB when the system used Haar wavelet compared to FFT-OFDM with...
In this paper an improved RLS (ImRLS) based adaptive MMSE decision directed MC-CDMA Receiver for Rayleigh fading channels is developed. The technique adopted by the ImRLS, is to reduce the noise components in the RLS-estimated channel frequency response before applying it to the MMSE adaptive detector. This is done by an IFFT, limiting window and an FFT. Simulation results in rayleigh fading multiuser...
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