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Event-Related Potentials (ERPs) is a regular electrophysiological response which is evoked by outer world events or stimuli from brain, and an important approach to explore the human cognitive function. A variety of methods have been proposed for an attempt to analyze it, with varying degrees of success. In this paper, we have proposed a novel method for learning the ERPs, which bases on the effective...
With fast speed and reliable capability of depth recovery, two-frequency phase measuring profilometry (PMP) is widely used for reconstructing 3-D surface. However, it suffers from random noise when the number of patterns is less. In this paper, we propose a hybrid pattern coding scheme which embeds Gray coding patterns into high-frequency PMP patterns through amplitude modulation. From captured modulated...
This paper aims at providing explicit, closed-form solutions to the error probability performance analysis of digital communications over fading channels. This is achieved by first deriving a family of new upper bounds on the Gaussian Q-function Q(x), which is given by a sum of products of the exponential function and c/x where c is a constant. The bounds obtained can be made arbitrarily tight as...
We consider a differential amplify-and-forward transmission scheme for a two-user cooperative system with a single relay. We propose a new analytical approach based on first principles, and obtain a closed-form expression for the exact bit error probability (BEP) in Rayleigh fading. This result involves only a single exponential integral function. It applies generally to the case where the channel...
The ultra-wideband (UWB) wireless technology is a hot point in communication area. Pulse position modulation with time hopping (PPM-TH) and pulse amplitude modulation with direct sequence (PAM-DS) are two of the basic UWB modulation methods. In this paper, we study the performances of the traditional UWB and time reversal (TR) UWB in the PPM-TH and PAM-DS system respectively. We found that the performance...
Extracting event-related potentials (ERPs) from multichannel EEG recordings remains a challenge due to the poor signal-to-noise ratio (SNR). This paper presents a multivariate statistical model of ERPs by exploiting the existing knowledge about their spatio-temporal properties. In particular, a computationally efficient algorithm is derived for fast model estimation. The algorithm, termed SIM, can...
To preserve the frame error rate (FER) of multimedia applications in the polling-based HCCA of 802.11e/a WLAN is important especially under low signal-to-noise ratio (SNR) conditions. MAC frame retransmission is an effective technique to reduce the FER, especially when there has no better modulation and coding scheme (MCS) can be selected. The Surplus Bandwidth Allowance (SBA) field in the Traffic...
The ultra-wideband (UWB) wireless technology is a crucial technique. Pulse position modulation with time hopping (PPM-TH) is one of the basic UWB modulation methods. In this paper, we study the traditional UWB and time reversal (TR) UWB performance in the PPM-TH system respectively. Although the performance of TR UWB is better than normal UWB, the Bit Error Rate (BER) is high when the noise is large...
This paper concerns modulation recognition for blind modulated signals. We use the decision theory, which is popularly used in most researches, to discriminate eleven analog and digital modulated signals with nine key parameters. The carrier frequency is important to calculate some other key parameters. However, for the blind signals, the carrier frequency is unknown, so we propose a method for estimating...
Based on the matrix formulation of cooperative-OFDM signals, the bayesian CRB(BCRB) for blind, semi-blind and non-blind channel estimation in cooperative-OFDM system was derived. The BCRB for semi-blind channel estimation was a generic expression, which could be extrapolated to the BCRB for blind and non-blind channel estimation. The effect of the priori information on BCRB was also discussed. We...
In this paper, a blind method to detect and suppress narrow-band interference (NBI) for multi-band orthogonal frequency-division multiplexing (MB-OFDM) based ultrawideband (UWB) communications is proposed. The method utilizes mean-square-error (MSE) statistics in the frequency domain to detect subcarriers damaged by NBI. Approximating the MSE statistics by a decision-feedback (DF) scheme creates a...
In OFDM systems, carrier frequency offset (CFO) between the transmitter and the receiver destroys the orthogonality among subcarriers and induces strong inter-carrier interference (ICI). For the CFO estimation schemes based on frequency-domain pilot signals, the estimation performance is degraded and bounded by the ICI. In this work we propose a novel CFO estimation scheme - PTA-based with ICI elimination...
The exact performance analysis of MMSE (minimum-mean-square-error) combining for space diversity reception is studied in the presence of a single and multiple cochannel interference (CCI) sources, and compared to maximum-ratio combining (MRC). This paper considers digital cellular mobile radio systems with quadrature amplitude modulation (QAM) transmission and two diversity antennas in flat and quasi-static...
Model compensation is an important means to improve the robustness of speaker recognition in noise environment. The robust speaker recognition approach based on model compensation is proposed in this paper. The proposed method combines data reliability estimation and feature components effectiveness estimation, so the errors of the second kind due to the estimation error are reduced greatly. The proposed...
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