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Data transmission technology has a wide rang of application in the industrial production.But the security and reliability of the data transmission can not be guaranteed because of difficult and complex wiring. As for these problems,this paper puts forward a new scheme of wireless data transmission system based on Si4421, the system's hardware and software design is also explained in detail in this...
As the typical branch of the city union system, taxi settlement center system of Xi'an metropolitan union card, is the essential bridge which connects taxi operating company to the central liquidation system. It is responsible for processing transaction date which send by these pos equipments. The transaction data generated when the union cards were used to consume on the pos equipments. Taxi settlement...
This paper presents a novel video encoding algorithm using the technique of Hybrid Vector Quantization (HVQ). Two modes of operations are defined in the encoder part, i.e. intra-mode and inter-mode. A blended algorithm based on Mean Coding and Conventional VQ (MCCVQ) using an intra-codebook is adopted for the intra-mode of operation. In the inter-mode of operation, no-encode sub-mode is for static...
The method of engineering setting-out, the mechanism of Real Time Kinematic (RTK) and the procedure of real engineering measurement and setting-out are introduced. The method of GPS-RTK application in real time engineering measure is presented according to the setting-out of engineering measurement and position. The procedure of GPS-RTK engineering setting-out is also given. The advantage and superiority...
Whether it is classic filter denoising, Fourier transform denoising, or the emerging wavelet transform denoising, a common characteristic is that denoising is only limited to some transform field. Also, these denoising methods are influenced greatly by the change of signal parameters, such as frequency, amplitude, etc. In order to effectively overcome the above-mentioned shortcomings of these denoising...
In the paper, we investigate the selection algorithm of hybrid selection and maximum-ratio combining systems. Most existing algorithms require channel coefficients of all receive antennas. It is difficult to satisfy for reduced number of RF chains. Therefore, a new selection algorithm is proposed so that the number of required channel coefficients equals that of RF chains. The presented algorithm...
The paper investigates the effect of feedback delay on hybrid selection and closed-loop transmit diversity in Rayleigh time-selective flat fading. A Jakes model was used to formulate channel state correlation as a function of feedback delay and a Markov model was used to characterize channel state evolution. According to these models, the receive SNR is obtained. Averaging the receive BER over the...
The paper investigates closed-loop spatial multiplexing systems with transmit antenna selection. Since the bandwidth limit of feedback channel, a partial MRT algorithm is proposed to reduce the amount of feedback information. An improved water-filling power allocation algorithm is obtained for optimal power allocation. The proposed method can not only reduce the amount of feedback, but also fully...
In this paper we investigate a scheme combining transmit-antenna selection (TAS) and equal gain transmission (EGT). The expected received SNR of the proposed systems is derived according to the probability distribution of channel fading. The algorithm of determining the minimum of required RF chains is put forward in terms of a given transmit antennas. A new phase quantization algorithm of optimum...
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