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In this paper, we introduce WAVE communication technology and some research activities for next generation ITS communication system. Using Vehicle-to-Vehicle communication service in addition to existing Vehicle-to-Infrastructure communication service, we can improve safety, sustainability and convenience on the road.
Due to the increasing requirements on the high speed communication and infotainment applications for automobiles, much research has been carried out for high speed automobile network technology called Media Oriented System Transport (MOST). Since many electronic control units (ECUs) are connected to the traditional automotive networks such as CAN, LIN and FlexRay, a network gateway is needed to bridge...
Increasing network reliability and reducing the fault tolerance of Media Oriented System Transport (MOST) network which has been adopted by major car maker such as BMW, AUDI, as in-vehicle backbone network has to be employed the full duplexing configuration. In this paper, proposed MOST network system is applied to two communication ports which enable to provide redundant path. Thus proposed system...
While the number of FFT stages increases logarithmically (log2N) as the transform length (N) increases, the number of required registers (or, memories) increases linearly. In large transform length FFT designs, the registers occupy more than 70% of the chip area. Recently, combined integer mapping (CIM) method was proposed to reduce the memory size of IFFT for OFDM transmitters. The CIM method focuses...
Interpolation circuits are widely used in many communication and digital signal processing systems. In this paper, we present a new interpolation algorithm to obtain the peak values of input waveforms in the shape of normal distribution curve used in XRF systems. Proposed algorithm is based on the combination of FFT and Lagrange interpolation method. In addition, optimized max value search algorithm...
Interpolation filters are widely used in many communication and multimedia applications. Recently, FIR interpolation method using supplementary filters was proposed to improve the performances of polynomial interpolation methods. In this paper, we propose a weighted interpolation method using supplementary filter which can be efficiently applied to XRF spectroscopy. It is shown that the proposed method...
Interpolation filters are widely used in symbol timing recovery systems to interpolate new sample values at arbitrary points between the existing discrete-time samples. Polynomial interpolation computes the coefficients of the polynomial according to the input information to obtain the position value. In this paper, we propose an efficient way to implement the third-order Lagrange interpolation circuit...
FFT(Fast Fourier Transform) processor is one of the key components in the implementation of OFDM systems for many wireless standards such as IEEE 802.22. To improve the performances of FFT processors, various studies have been carried out to reduce the complexities of multipliers, memory interface, control schemes and so on. While the number of FFT stages increases logarithmically (log2N) as the transform...
This paper proposes a new synchronization method for Takagi-Sugeno (T-S) fuzzy chaotic systems via receding horizon control. A matrix inequality condition on the terminal weighting matrix is proposed for T-S fuzzy chaotic systems under which nonincreasing monotonicity of the optimal cost is guaranteed. It is shown that the proposed terminal inequality condition guarantees the closed-loop stability...
Sound source localization systems in service robot applications estimate the direction of a human voice. Time difference information obtained from a few separate microphones is widely used for the estimation of the sound direction. The cross-correlation function is computed in order to calculate the time difference between the two signals. Inverse cosine function is used when the position of the maximum...
In this paper, we propose a receding horizon control approach to synchronization for chaotic systems. A new matrix inequality condition on the terminal weighting matrix is proposed for chaotic systems under which nonincreasing monotonicity of the optimal cost is guaranteed. It is shown that the proposed terminal inequality condition guarantees the closed-loop stability of the receding horizon synchronization...
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