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In this paper, a low overhead preamble structure is proposed for the interference approximation method — complex (IAM-C) method in offset quadrature amplitude modulation based orthogonal frequency division multiplexing (OQAM-OFDM) systems. Compared with the conventional preamble structure with three columns of symbols, the proposed preamble structure only requires two columns of symbols as the preamble...
The electronic cluster eye (eCley) is a new artificial compound eye with some prominent properties of high resolution, miniature volume, and large field of view. Although having the potential capability of obtaining the depth information, the limitation of the short focal length and tiny volume of the eCley still confine the conventional stereo matching algorithms to determine the distances of objects...
In this letter, a novel curve fitting based tone reservation (CF-TR) method is proposed to reduce the peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems, and its key idea is to utilize the clipping noise introduced by clipping to generate an ideal peak-canceling signal. To effectively eliminate the peaks of the OFDM signal, the CF-TR method generates the...
Noise in water is very crtical and may destroy the the OFDM based underwater acoustic communication system. The performance of pilot tones based channel estimation will not be the good choice under low SNRs. Complete frequency response of data channel is usually obtained by interpolating channel frequency response at pilot bits, such that the error of interpolation influences and degrades the performance...
In this paper, we consider the Gaussian cognitive broadcast channel in which the primary user communicate to the primary receivers and the cognitive user has noncausal knowledge of the primary radio's codeword and wishes to communicate to two receivers. We characterize the largest rate region at which the cognitive user could reliably communicate under the constraints that no rate degradation is created...
Many communication signals exhibit cyclostation-arity with some cycle frequencies and the cycle frequencies are related to signal parameters such as symbol rates or carrier frequencies. Dandawate proposed an asymptotically optimal chi-square statistical test to check the presence of cyclostationarity. In the last few years, the statistical test has been applied to spectrum sensing for cognitive radios...
Coexistence of different users in cognitive radio (CR) network sharing the same frequency band can cause severe in-band interference. In this paper, we propose a novel scheme of joint interference estimation and decoding to combat the narrowband interference for OFDM-based (orthogonal frequency division multiplexing) CR systems in an iterative way. Moreover, we present some complexity reduction techniques...
66 samples from the human oral mucosa tissue, including 43 normal and 23 malignant tissue samples were measured by confocal Raman microspectroscopy. The low signal-to-background ratio spectra from human oral mucosa tissues were obtained by this technique without any sample preparation. A preprocessed algorithm based on wavelet analysis was used to reduce noise and eliminate background of Raman spectra...
Combination control technology (CCT) was used widely in seismic prospecting. When ambient noise is strong enough, high-quality seismic data is hardly to be acquired by CCT. To improve signal-to-noise ratio (SNR), phase control technology (PCT) was developed. As different elements of distributed vibrator array system (DVAS) located at different positions, there were wave-differences between each element...
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