Advanced Materials Research Vols. 926-930

Abstract: For extracting relatively stable and invariable feature from non-stationary EEG in mult-class pattern, many scholars study a feature extraction method, which is called as modified multi-classcommon spatial pattern. It adopts one-to-one strategy to expand common spatial pattern to multi-class classification. While for the solution of airspace filter, Kullback-Leibler distance defines pattern of discrimination of minimize difference within class and maximize difference between classes. And it establishes a function to measure difference within the class. The experiment verifies that the algorithm can obtain feature information with recognition capability which implys in the non-stationary EEG and acquires preferable classification result.

Abstract: Single carrier frequency domain equalization (SC-FDE) has been receiving much attention for its advantage of suppressing inter-symbol interference (ISI). We proposed a frequency domain iterative decision feedback equalization (FD-IDFE) algorithm for single carrier space time block coding (STBC) systems. The paper use the multi-antenna transmit and Alamouti signaling scheme to achieve the significant diversity gain. We design the feedback equalization structure by Mean Square Error (MSE) criterion and Lagrange optimization method, and we also consider the parameters estimation. At last, we compare the proposed algorithm with the conventional equalization schemes, the simulation results illustrate that our method has excellent performance.

Abstract: Based on the filter bank, the theory of multi-carrier modulation using Orthogonal Frequency Division Multiplexing (OFDM) and Modified Discrete Fourier Transform (MDFT) filter bank has been discussed and the detailed derivation process has been given. Following these discussions, the actual implementation of MDFT filter bank in multi-carrier modulation systems has been discussed, and then the comparison of their prototype functions, Peak to Average Power Ratio (PAPR) and Symbol Error Rate (SER) are drawn. Experimental results demonstrate that compared with the OFDM system, prototype functions of MDFT have obvious advantage in spectrum leakage. In terms of PAPR, they have similar performance. Whether using QPSK or 16QAM modulation, MDFT is superior to OFDM in symbol error rate as a whole and with increasing of filter length L, the advantage becomes more and more apparent.

Abstract: Electrocardiosignal feature extraction is the base of electrocard iologic automatic diagnosis. By using wavelet transform multi-resolution analysis, the noise in electrocard iosignal is removed; and by using proximity signals of wavelet transform the base linew ander is filtered. The high frequency noise is handled and eliminated with the default threshold; and the average value of the electrocardiosignals is set to zero. In detection of rpeak, because leak detection will occur when only 2³ detail signals is considered, thus the 2³ and 2⁴ detail signals are integrated to avoid miss detection effectively. The methods avoiding error detection bring excellent effects. For calculating average cardiac electric axis, among the methods of area method, time voltage method and amplitude method, the area method offers the highest accuracy.

Abstract: . Target tracking is not only an important operation mode of fire-control radar, but also the primary task of the fire-control system. Firstly, scalable and reusable signal-level target tracking simulation system of fire-control radar based on HLA is developed. Then starting from the signal-level simulation model, by antenna module, receiver and signal processing module, filtering and prediction module, control system modules being organically combined, target tracking system modeling and simulation is completed. The simulation result indicates that the simulation system can carry out the dynamical process of target tracking effectively, it is of some reference value for the research on training simulation system design of fire-control radar and electronic warfare system evaluation .

Abstract: This paper uses the split-step Fourier transform method to solve the higher-order nonlinear Schrödinger equation for the transmission of the soliton pulse in the optical fiber, studies the evolution laws of the generation and transmission of the short pulse by changing intracavity dispersion distribution and validates the mode locking and transmission characteristics of the pulse under dispersion management.

Abstract: This dissertation systematically studies beam space high resolution bearing estimation algorithms. The solution to target resolving and bearing estimation is proposed to remove the contribution from interferes outside the beam coverage area. MVDR adaptive beam based on sample covariance matrix inversion (SMI) is demonstrated for the condition under which strong interferes and signals are weakly correlated. For the situation that strong interferes and signals are strongly correlated, MVDR beam forming algorithm based on virtual interferes is proposed to suppress strong interferes. Simulation results indicate that the beam space MUSIC algorithm based on MVDR is an effective way to resolve multiple targets in small angle domain.

Abstract: This paper focuses on the F0 in Mongolia folk long song’s vibrato, with the basic voice parameters, it is found that the three styles of the vibrato: symmetrical style, right-side style, left-side style. On the one hand, this paper explains the acoustic characters of the Mongolia folk long song’s vibrato, and on the other hand, the results of this paper can be the references for establishing the standards of the oral cultures’ digital protections.

Abstract: According to IEEE Std 802.11p, a fast DOA estimation algorithm of multiple targets based on beam-forming techniques in OFDM radar-communication system for vehicular applications is discussed in this paper. The proposed algorithm has reduced computational complexity utilizing high order power of the inverse spatial covariance matrix without eigen-decomposition. Simulation results demonstrate it is suitable for vehicular application.

Abstract: In order to reduce the burden of the calculation and the low frequency resolution of the tradition GNSS signal intermediate narrow band anti-jamming method, it introduces a high efficient approach of narrow band interference rejection based on baseband GNSS signal processing. After digital down conversion to baseband and down sampling to a low rate, the interference is removed in frequency domain. According to the theoretical analysis and simulation, it claims that the method can reduce the calculation and increase the detection resolution in frequency domain which will realize a high efficient interference rejection.