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15. Time-Frequency Multiplex Estimator and Low Complexity Equalizer Design for Multi-Carrier Systems with TX/RX IQ Imbalance, CFO and Multipath Fading Channels

Author

Juinn-Horng Deng, Kuang-Min Lin, and Kuo-Tai Feng

Subjects
Computer science, Orthogonal frequency-division multiplexing, Carrier frequency offset, Transmitter, Electronic engineering, Estimator, Equalizer, Transceiver, Multipath propagation, Communication channel, Time–frequency analysis
Abstract

A low complexity time-frequency multiplex estimator and low complexity equalizer transceiver design is proposed to combat the RF impairment problems for the zero-IF transceiver of multi- carrier systems. Moreover, the proposed preamble can estimate and compensate the transmitter/receiver (Tx/Rx) in-phase and quadrature-phase (IQ) imbalance, carrier frequency offset (CFO), and channel impulse response parameters. There are two parts in the proposed system. Firstly, all parameters of impairments are estimated by the proposed time-frequency multiplex estimator design. Secondly, the estimated parameters are used to equalize the above problems and detect the transmitted signal with low complexity advantage. Simulation results confirm that the proposed estimator can provide reliable performance over the severe Tx/Rx IQ imbalance, CFO, and multipath fading channel environments.

Published
2015

22. Compiling the marine environment spectrum based on inversion satellite remote sensing data

Author

Wei Yi Zhao, Zeng Jie Cai, Xiao Hua Yang, and Tai Feng Zhang

Subjects
Fuzzy clustering, Computer science, Satellite remote sensing, Inversion (meteorology), Large scale data, Area measurement, Remote sensing
Abstract

Through inversion of the satellite remote sensing data, the values of the environmental factors in the corresponding research area are obtained. By synthesizing the influence of marine environment on damage of the structure, equipment or system, the specific affecting factors in he research area have been determined, and the inversion result has been verified by the measured data. The problem in analyzing and processing large scale data has been solved by using the weight fuzzy clustering theory and the data trace technology, and the marine environment spectrum with more applicability has been established.

Published
2011

26. An optical anti-shake system with a tremor sensing module and compact linear piezomotors

Author

Chien Li, Tai-Feng Wu, and Ching-Chang Chen

Subjects
Vibration, Engineering, CMOS sensor, Software, CMOS, business.industry, Position (vector), Control system, Acoustics, Electronic engineering, Shake, business, Displacement (vector)
Abstract

In this study, a new piezomotor is presented, and an optical anti-shake image system using this piezomotor is also developed. Comparing with other linear piezomotors, this motor is simpler, compacter, and more powerful. The dimension of the motor is 16mm(L)×8mm(W)×1.5mm(H), and the resonate frequency is 220kHz. Moreover, the push force at operating voltage 10Vpp is 15g, and the power consumption is 0.23W. Because of the long travel range:±2mm and high maximum velocity:26mm/s, it could satisfy the compensative displacement of the CMOS sensor caused by the hand tremor in a anti-shake image system. In this paper, a dynamic behavior of the piezomotor is investigated by COMSOL software, and the control algorithm in the optical anti-shake image system, including tremor sensing, motor position sensing, is also described.

Published
2009

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