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This paper presents a speech enhancement algorithm for Thai speech corrupted by noise. A Markov random field (MRF) is used to remove noise from the noisy speech. Specifically, the noisy speech is transformed using a short time Fourier transform (STFT) resulting in time-frequency representation coefficients. Then, it is fed into a voiced/unvoiced classification by using voice activity detector (VAD)...
Effect of additive white Gaussian noise on accuracy performance of a six-port reflectometer (SPR) is presented in this paper. Three six-port circuits (sampling line, five-port ring and ideal design) calibrated with different calibration techniques (five and seven standard loads based) are investigated. Mathematical model of a SPR is developed and simulated. To evaluate the accuracy performance of...
This paper proposes a new color image watermarking scheme based on coefficients modification in LL sub-band. Basically, the blue component of original color image is decomposed by the Discrete Wavelet Transform (DWT) to obtain the coefficients in LL sub-band in order for embedding a single watermark bit with a tuned constant value to achieve the optimum watermark strength. To extract this embedded...
For MIMO beamforming, the Eigen Beamforming (EB) technique provides the best performance with the expense of knowing full channel information. To reduce such an expense, the Quantized Beamforming (QB) has been presented by using only some feedback bits to calculate the suitable beamforming vectors. However, QB has a drawback in the complexity of finding the beamforming vectors and it is more difficult...
In this paper, we investigate a path selection approach for wireless cooperative multihop communications with one source, one destination, and multiple intermediate relaying nodes, which are clustered linearly. Specifically, we adopt a cooperative maximum ratio combining (C-MRC) technique as a framework for the path selection approach, namely a C-MRC-based approach and a modified C-MRC-based approach...
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