Fu Hongliang

Design of the Measurement Node of the Grain Quantity Monitoring System Based on the CAN-bus

To need the requirement of measuring the grain quantity in the barn, the pressure sensors are mounted on the ground and the wall of the barn, and the grain quantity can be calculated by using these measurement values. To realize the data transmitting reliability and real time, the design proposal of the measurement node of the CAN-bus by using the chips of AT89C51 and the SJA1000 is put forward, and the design of software and the hardware of the node is given. To verify the effectivity and the reliability of the measurement node, some experiments are done, the results shown that, the measurement error is no more than 3% under the conspicuous level is equal to 0.05, the grain quantity can be measure by this system completely.

The Study of Acquisition Technology in the Grossness Field Inspection System of Stored-Grain

The paper proposed scheme and implement for the grossness inspection system of grain depot based on the actual demand of the system and the electrical confine analysis on the application environment. The test results is shown that, on the communication condition of 1Km distance and 5Kbps rate, the mistake code didn’t appeared and the measure error is less than 2.4% in the relative MSD, which can meet with the precision demand of the inspection system. The design should be served as the useful reference to the study of acquisition technology in similar system.

Research on compressed sensing of KL domain with limited feedback in MIMO-OFDM system

In order to solve the problem of feedback link overhead in MIMO-OFDM system, and improve the transmission efficiency, a limited feedback method based on KL domain is proposed in this paper. In this method, the state information which is obtained from the channel estimation performed in KL domain sparse at the receiving end. Thereby a small amount of linear measurements are obtained which represents the total channel state information, Then these measurements are fed back to the transmitting end. In the transmitter, the channel state information is reconstructed through orthogonal matching pursuit algorithm. The simulation results show that the proposed limited feedback based on KL (Karhuner-Loeve) domain method can achieve full channel state feedback effect and decreases the overhead in the feedback link.

Study on the Real Time Log-domain Conversion for Detecting the Transient Feeble Optical Signal

Based on the properties of transient feeble optical signal, which is the wide dynamic range and the feeble lower limit signal, it is presented a novel detecting scheme compressing signal real-time in logarithmic domain in this paper. After the principle analysis of the scheme, it has been implemented to choose appreciate parts, design the circuitry and test. The results indicated that the approach can make transient optical signal ranged 120dB compress in the range of 0~5V. And together with the circuitry design simplified and the dissipation decreased, the troubles at the back data acquisition module can be lessened greatly. It may be a novel clue for research on the tech of detecting the transient light and provide certain reference values to similar system design.

The implement of the stored-grain grossness remote monitoring system based on GPRS and ZigBee

According to the actual demand of the system, the paper proposed scheme and implement for the stored-grain grossness remote monitoring system based on GPRS and Zigbee. The test result is shown that the max error is ∼0.02mA between inversion value of the server-side data and the measure value. The design should be served as the useful reference to the study of acquisition technology in similar system.

Performance analysis of improved CHASE detection algorithm for MIMO-OFDM systems

The throughout of wireless communication systems can be improved by adding multiple antennas at the transmitter and receiver to create multiple-input multiple-output channels. To avoid the prohibitive complexity involved in the ML detectors, some special detectors were proposed to improve the performance-complexity trade-off, such as zero-forcing(ZF), minimum mean-square(MMSE), vertical Bell labs layered space-time(VBLAST), sphere detection(SD), etc, but the performance and complexity gaps between the optimal detector and the suboptimal detector leaves substantial room for improvement. In order to improve the detection performance, an improved algorithm which combines ordered-QR decomposition algorithm with CHASE detection framework was presented, which can reduce computational complexity and error spread effectively. Simulation results show that the improved algorithm has better performance than conventional BLAST algorithm over frequency selective fading channel, which can get excellent performance-complexity trade-off.

A Novel STBC Scheme in MIMO CDMA System

A novel STBC scheme in MIMO CDMA system is presented. In the proposed scheme, the input symbols are split in blocks, each block has M symbols (M is the number of transmitting antennas), the M symbols are circularly encoded into M groups (each group has M cyclic symbols), the encoded M × M symbols are transmitted in Msymbol durations through Mantennas by multiplying M spread-codes respectively. The proposed STBC scheme has full coding rate (rate 1) and full diversity order but the decoding method is as simple as the conventional STBC introduced by Alamouti [1].

A Novel Beam-forming Algorithm in Antenna Array MC-CDMA System

A novel beam-forming algorithm in antenna array MC-CDMA system is proposed in this paper. First, the beam-formed signals on every sub-carrier are combined by using ORC, EGC or MRC, and then the decision of the combined signal and the estimated channel parameters are used to reconstruct the signal on every sub-carrier, finally the difference between the reconstructed signal and the output signal of the beam-former is used to control the coefficients of the beam-former. The bit error probability of the proposed algorithm is also analyzed in this paper