Patents by Inventor Jeng-Kuang Hwang
Jeng-Kuang Hwang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10750544Abstract: An analysis method for multi-user random access signals is disclosed, which solves the connection problem between a base station and a user equipment when the narrow-band IoT uplink signal transmission is implemented. The analysis method of the present invention utilizes the detection threshold value to effectively determine multiple user equipment to be signaled; then, for each detected user equipment, an effective method based on the phase difference is used to estimate their synchronization parameters, i.e. time-of-arrival (ToA) and residual carrier frequency offset (RCFO). Therefore, according to the present invention, random access signals can be received correctly and efficiently and the user equipment related information can be obtained at the same time to facilitate subsequent communications.Type: GrantFiled: December 20, 2018Date of Patent: August 18, 2020Assignee: Yuan Ze UniversityInventor: Jeng-Kuang Hwang
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Publication number: 20190357258Abstract: An analysis method for multi-user random access signals is disclosed, which solves the connection problem between a base station and a user equipment when the narrow-band IoT uplink signal transmission is implemented. The analysis method of the present invention utilizes the detection threshold value to effectively determine multiple user equipment to be signaled; then, for each detected user equipment, an effective method based on the phase difference is used to estimate their synchronization parameters, i.e. time-of-arrival (ToA) and residual carrier frequency offset (RCFO). Therefore, according to the present invention, random access signals can be received correctly and efficiently and the user equipment related information can be obtained at the same time to facilitate subsequent communications.Type: ApplicationFiled: December 20, 2018Publication date: November 21, 2019Inventor: JENG-KUANG HWANG
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Publication number: 20190140690Abstract: Present disclosure relates to a base station and a method for operating the same. The base station includes a communicating unit and a processing unit. The communicating unit is wirelessly connected to user equipments in the internet of things. The communicating unit is configured to receive a frequency hopping preamble sequence from a user equipment. The processing unit, electrically coupled to the communicating unit, is configured to obtain frequency hopping energies corresponding to a plurality of symbol groups from the frequency hopping preamble sequence. The processing unit is configured to accumulate the frequency hopping energies and calculate an average energy corresponding to one symbol group according to the accumulated frequency hopping energies. The processing unit is configured to calculate a threshold based on the average energy and a false alarm rate, wherein the threshold is applied to determine whether signals sending from the user equipment are noises.Type: ApplicationFiled: November 9, 2017Publication date: May 9, 2019Inventors: Jeng-Kuang HWANG, Cheng-Feng LI, Chin-Gwo MA
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Patent number: 10284255Abstract: Present disclosure relates to a base station and a method for operating the same. The base station includes a communicating unit and a processing unit. The communicating unit is wirelessly connected to user equipments in the internet of things. The communicating unit is configured to receive a frequency hopping preamble sequence from a user equipment. The processing unit, electrically coupled to the communicating unit, is configured to obtain frequency hopping energies corresponding to a plurality of symbol groups from the frequency hopping preamble sequence. The processing unit is configured to accumulate the frequency hopping energies and calculate an average energy corresponding to one symbol group according to the accumulated frequency hopping energies. The processing unit is configured to calculate a threshold based on the average energy and a false alarm rate, wherein the threshold is applied to determine whether signals sending from the user equipment are noises.Type: GrantFiled: November 9, 2017Date of Patent: May 7, 2019Assignee: INSTITUTE FOR INFORMATION INDUSTRYInventors: Jeng-Kuang Hwang, Cheng-Feng Li, Chin-Gwo Ma
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Patent number: 9537701Abstract: A joint estimation and compensation method of RF imperfections in a LIE (Long Term Evolution) uplink system comprises steps: establishing a joint signal model with RF imperfections; according to the joint signal model, undertaking estimation and compensation of CFO, DC offset, multipath channel, IQ imbalance and shaping filter imbalance of a received signal; and using a frequency equalizer to equalize said received signal and determine modulation data. For reducing computational complexity, the present invention further converts the received signal from a time domain to a frequency domain to undertake frequency domain compensation. The present invention can indeed solve the problems of IQ imbalance, filter imbalance, DC offset, multipath channel and CFO and effectively estimate and compensate RF imperfections in the LTE uplink system.Type: GrantFiled: December 17, 2015Date of Patent: January 3, 2017Assignee: Yuan Ze UniversityInventors: Juinn-Horng Deng, Hung-Yang Hsieh, Jeng-Kuang Hwang, Yi-Hsin Lin, Sheng-Yang Huang, Kuang-Min Lin
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Publication number: 20160285667Abstract: A joint estimation and compensation method of RF imperfections in a LIE (Long Term Evolution) uplink system comprises steps: establishing a joint signal model with RF imperfections; according to the joint signal model, undertaking estimation and compensation of CFO, DC offset, multipath channel, IQ imbalance and shaping filter imbalance of a received signal; and using a frequency equalizer to equalize said received signal and determine modulation data. For reducing computational complexity, the present invention further converts the received signal from a time domain to a frequency domain to undertake frequency domain compensation. The present invention can indeed solve the problems of IQ imbalance, filter imbalance, DC offset, multipath channel and CFO and effectively estimate and compensate RF imperfections in the LTE uplink system.Type: ApplicationFiled: December 17, 2015Publication date: September 29, 2016Inventors: JUINN-HORNG DENG, HUNG-YANG HSIEH, JENG-KUANG HWANG, YI-HSIN LIN, SHENG-YANG HUANG, KUANG-MIN LIN
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Patent number: 8594156Abstract: A multi-carrier spread spectrum device using cyclic shift orthogonal keying includes: a modulation unit for receiving a first part of data bits and transforming the first part of data bits to a modulation symbol di by modulation; a cyclic-shift unit for receiving a base code c(0) and a second part of data bits, and performing a cyclic-shift to the base code c(0) in accordance with the second part of data bits to generate a CSOK symbol c(mi); and a multiplier for multiplying the modulation symbol di by the CSOK symbol c(mi) to generate a spread spectrum signal ci.Type: GrantFiled: September 16, 2011Date of Patent: November 26, 2013Assignee: Yuan Ze UniversityInventors: Jeng-Kuang Hwang, Yu-Lun Chiu
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Publication number: 20120039364Abstract: A multi-carrier spread spectrum device using cyclic shift orthogonal keying includes: a modulation unit for receiving a first part of data bits and transforming the first part of data bits to a modulation symbol di by modulation; a cyclic-shift unit for receiving a base code c(0) and a second part of data bits, and performing a cyclic-shift to the base code c(0) in accordance with the second part of data bits to generate a CSOK symbol c(mi); and a multiplier for multiplying the modulation symbol di by the CSOK symbol c(mi) to generate a spread spectrum signal ci.Type: ApplicationFiled: September 16, 2011Publication date: February 16, 2012Inventors: Jeng-Kuang HWANG, Yu-Lun Chiu
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Patent number: 8036287Abstract: A multi-carrier spread spectrum device using cyclic shift orthogonal keying includes: a modulation unit for receiving a first part of data bits and transforming the first part of data bits to a modulation symbol di by modulation; a cyclic-shift unit for receiving a base code c(0) and a second part of data bits, and performing a cyclic-shift to the base code c(0) in accordance with the second part of data bits to generate a CSOK symbol c(mi); and a multiplier for multiplying the modulation symbol di by the CSOK symbol c(mi) to generate a spread spectrum signal ci.Type: GrantFiled: November 2, 2007Date of Patent: October 11, 2011Assignee: Yuan-Ze UniversityInventors: Jeng-Kuang Hwang, Yu-Lun Chiu
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Patent number: 7634233Abstract: The present invention relates to a transmission system with interference avoidance capability, which includes a transmission apparatus and a receiving apparatus. The transmission method thereof receives first data by means of an interference-processing module of the transmission apparatus and adds a plurality of extension data to the first data to produce second data for replacing a plurality of data corresponding to an interfered band in the second data with zero data, and then producing transmission data. The transmission data is converted to a radio-frequency signal by a transmission-processing module and transmitted to the receiving apparatus. Thereby, signal interference can be prevented by avoiding spectrum overlap regions.Type: GrantFiled: November 27, 2006Date of Patent: December 15, 2009Assignee: Chung Shan Institute of Science and TechnologyInventors: Juinn-Horng Deng, Jeng-Kuang Hwang, Po-Tien Lee, Fu-Chin Shau
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Patent number: 7539265Abstract: A multiple-input multiple-output code division multiple access (MIMO-CDMA) wireless communication equipment has a transmitter and a receiver. The transmitter has an encoder for receiving and encoding a plurality of data, and sending the data to a quadrature phase-shift keying (QPSK) unit. The QPSK unit conducts QPSK modulating to an output of the encoder and sends it to a space-time block coding (STBC) unit or a space multiplexer to process space-time coding or space coding. A plurality of data frame generating modules generate a data frame respectively based on the output of the STBC unit, a plurality of preamble codes generated by a preamble code spreading unit, a pilot code and a cyclic prefix. The data frame is sent to the receiver via a plurality of transmitting antennas.Type: GrantFiled: November 9, 2005Date of Patent: May 26, 2009Assignee: Chung Shan Institute of Science and Technology, Armaments Bureau, M.N.D.Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang, Po-Tien Lee, Fu-Chin Shau
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Publication number: 20090129444Abstract: The present invention relates to a multi-code multicarrier code division multiple access system in frequency-selective fading channels. According to the present invention, the transmitting device thereof uses the mapping/spectrum-spreading units to receive the plurality of substreams, map and spread the plurality of substreams, and produce a plurality of biorthogonal keying data items. The plurality of repetition units receives the plurality of biorthogonal keying data items, respectively, repeats the plurality of biorthogonal keying data items, and produces the plurality of repeated data item. The shifting units shift the plurality of repeated data items, respectively, and produce a plurality of shifted data items. The shifted data items are orthogonal to each other. Thereby, the peak-to-average-power-ratio (PAPR) is lowered.Type: ApplicationFiled: November 20, 2007Publication date: May 21, 2009Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang, Yu-Lun Chiu, Rih-Lung Chung
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Publication number: 20090076789Abstract: A pre-verifying method for software/hardware design of a communication system includes simulating a process of sending a data frame from a transmitter to a receiver with a transceiver algorithm meeting a preset specification for obtaining simulation parameters. A transmitter hardware platform sends the data frame via an antenna. A receiver hardware platform receives an echo signal of the data frame and compares each parameter of the echo signal with the simulation parameters. The comparison result of various parameters of the echo signal and the simulation parameters is verified to be in a desired range or not. When the comparison result is not in the desired range, the transceiver algorithm is adjusted. When the comparison result is in the desired range, the transceiver algorithm is converted to a hardware program language format to be written in a programmable module to perform the action of the transmitter and the receiver.Type: ApplicationFiled: November 20, 2008Publication date: March 19, 2009Applicant: Chung Shan Institute of Science and Technology, Armaments Bureau, M.N.D.Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang, Po-Tien Lee, Fu-Chin Shau
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Publication number: 20090059882Abstract: A multi-carrier spread spectrum device using cyclic shift orthogonal keying includes: a modulation unit for receiving a first part of data bits and transforming the first part of data bits to a modulation symbol di by modulation; a cyclic-shift unit for receiving a base code c(0) and a second part of data bits, and performing a cyclic-shift to the base code c(0) in accordance with the second part of data bits to generate a CSOK symbol c(mi); and a multiplier for multiplying the modulation symbol di by the CSOK symbol c(mi) to generate a spread spectrum signal ci.Type: ApplicationFiled: November 2, 2007Publication date: March 5, 2009Inventors: Jeng-Kuang Hwang, Yu-Lun Chiu
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Publication number: 20080292009Abstract: The present invention relates to a multiple-input-multiple-output (MIMO) wireless transmission system and a transmission method thereof. A wireless transmitting system thereof receives encoded data via a first processing unit, which processes the encoded data and outputs the encoded data to a plurality of modulation units for modulating the encoded data to produce a plurality of modulated data. A plurality of first conversion units converts the plurality of modulated data to a plurality of transmitting signals. A plurality of radio-frequency (RF) circuits receives the plurality of transmitting signals and transmits RF signals according to the frequency-hopping sequence of a piconet. A plurality of receiving processing units of a wireless receiving system according to the present invention receives the RF signals, respectively, according to the frequency-hopping sequence of the piconet and transmits to a plurality of second conversion units for converting the RF signals to received data.Type: ApplicationFiled: July 11, 2007Publication date: November 27, 2008Applicant: CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY, ARMAMENTS BUREAU, M.N.D.Inventors: Juinn-Hurng Deng, Jeng-Kuang Hwang, Yu-Min Chuang
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Publication number: 20080125046Abstract: The present invention relates to a transmission system with interference avoidance capability, which includes a transmission apparatus and a receiving apparatus. The transmission method thereof receives first data by means of an interference-processing module of the transmission apparatus and adds a plurality of extension data to the first data to produce second data for replacing a plurality of data corresponding to an interfered band in the second data with zero data, and then producing transmission data. The transmission data is converted to a radio-frequency signal by a transmission-processing module and transmitted to the receiving apparatus. Thereby, signal interference can be prevented by avoiding spectrum overlap regions.Type: ApplicationFiled: November 27, 2006Publication date: May 29, 2008Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang, Po-Tien Lee, Fu-Chin Shau
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Publication number: 20070133659Abstract: A Multiple-Output Multiple-Input Code-Division Multiple Access (MIMO-CDMA) apparatus and the coding method thereof. The apparatus includes a transmitter side and receiver side. Both of the transmitter side and the receiver side have a plurality of antennas for achieving the effect of multi-path transmission and receiving. In addition, at the receiver side, use preamble-spreading codes and space-time block coding technology to eliminate multi-path signal interference as well as to modify carrier frequency shift of the received signal.Type: ApplicationFiled: October 12, 2006Publication date: June 14, 2007Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang, Po-Tien Lee, Fu-Chin Shau
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Publication number: 20070104286Abstract: Equipment for a MIMO differential SC-FED communication system that includes a transmitter and a receiver is provided. The transmitter has a differential block encoder module for receiving a plurality of data block pairs and performing a circular convolution operation on the data blocks to produce a plurality of coded data blocks in a space-time block coding (STBC) unit. The STBC unit will perform a space-time block encoding process on the output from the differential block encoder module to obtain a plurality of transmitting data blocks. A plurality of frame generators receives the respective transmitting data blocks and adds a cyclic prefix to the corresponding transmitting data blocks to generate a plurality of block frames. Then, the frame generators send the block frames to the receiver of the present invention via a corresponding transmitting antenna.Type: ApplicationFiled: November 8, 2005Publication date: May 10, 2007Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang
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Publication number: 20070104287Abstract: A MIMO-CDMA wireless communication equipment has a transmitter and a receiver. The transmitter has an encoder for receiving and encoding a plurality of data, and sending the data to a quadrature phase-shift keying (QPSK) unit. The QPSK unit conducts QPSK modulating to an output of the encoder and sends it to a space-time block coding (STBC) unit or a space multiplexer to process space-time coding or space coding. A plurality of data frame generating modules generate a data frame respectively based on the output of the STBC unit, a plurality of preamble codes generated by a preamble code spreading unit, a pilot code and a cyclic prefix. The data frame is sent to the receiver via a plurality of transmitting antennas.Type: ApplicationFiled: November 9, 2005Publication date: May 10, 2007Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang, Po-Tien Lee, Fu-Chin Shau
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Patent number: 6658261Abstract: The present invention discloses a method for predicting fast fading using sinusoidal modeling techniques. The method first applies a finite impulse response low pass filter to the incoming signal thus increasing the fading power to noise ratio. Applying a root-MUSIC frequency estimation model, a sinusoidal model for the fading process is obtained. This model can be used to enhance the performance of spatial diversity schemes or temporal processing schemes to reduce the effect of the fading.Type: GrantFiled: August 20, 2002Date of Patent: December 2, 2003Assignee: AT&T Corp.Inventors: Jack Harriman Winters, Jeng-Kuang Hwang