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).

  • Patent number: 10750544
    Abstract: 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: Grant
    Filed: December 20, 2018
    Date of Patent: August 18, 2020
    Assignee: Yuan Ze University
    Inventor: Jeng-Kuang Hwang
  • Publication number: 20190357258
    Abstract: 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: Application
    Filed: December 20, 2018
    Publication date: November 21, 2019
    Inventor: JENG-KUANG HWANG
  • Publication number: 20190140690
    Abstract: 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: Application
    Filed: November 9, 2017
    Publication date: May 9, 2019
    Inventors: Jeng-Kuang HWANG, Cheng-Feng LI, Chin-Gwo MA
  • Patent number: 10284255
    Abstract: 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: Grant
    Filed: November 9, 2017
    Date of Patent: May 7, 2019
    Assignee: INSTITUTE FOR INFORMATION INDUSTRY
    Inventors: Jeng-Kuang Hwang, Cheng-Feng Li, Chin-Gwo Ma
  • Patent number: 9537701
    Abstract: 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: Grant
    Filed: December 17, 2015
    Date of Patent: January 3, 2017
    Assignee: Yuan Ze University
    Inventors: Juinn-Horng Deng, Hung-Yang Hsieh, Jeng-Kuang Hwang, Yi-Hsin Lin, Sheng-Yang Huang, Kuang-Min Lin
  • Publication number: 20160285667
    Abstract: 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: Application
    Filed: December 17, 2015
    Publication date: September 29, 2016
    Inventors: JUINN-HORNG DENG, HUNG-YANG HSIEH, JENG-KUANG HWANG, YI-HSIN LIN, SHENG-YANG HUANG, KUANG-MIN LIN
  • Patent number: 8594156
    Abstract: 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: Grant
    Filed: September 16, 2011
    Date of Patent: November 26, 2013
    Assignee: Yuan Ze University
    Inventors: Jeng-Kuang Hwang, Yu-Lun Chiu
  • Publication number: 20120039364
    Abstract: 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: Application
    Filed: September 16, 2011
    Publication date: February 16, 2012
    Inventors: Jeng-Kuang HWANG, Yu-Lun Chiu
  • Patent number: 8036287
    Abstract: 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: Grant
    Filed: November 2, 2007
    Date of Patent: October 11, 2011
    Assignee: Yuan-Ze University
    Inventors: Jeng-Kuang Hwang, Yu-Lun Chiu
  • Patent number: 7634233
    Abstract: 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: Grant
    Filed: November 27, 2006
    Date of Patent: December 15, 2009
    Assignee: Chung Shan Institute of Science and Technology
    Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang, Po-Tien Lee, Fu-Chin Shau
  • Patent number: 7539265
    Abstract: 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: Grant
    Filed: November 9, 2005
    Date of Patent: May 26, 2009
    Assignee: 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
  • Publication number: 20090129444
    Abstract: 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: Application
    Filed: November 20, 2007
    Publication date: May 21, 2009
    Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang, Yu-Lun Chiu, Rih-Lung Chung
  • Publication number: 20090076789
    Abstract: 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: Application
    Filed: November 20, 2008
    Publication date: March 19, 2009
    Applicant: 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
  • Publication number: 20090059882
    Abstract: 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: Application
    Filed: November 2, 2007
    Publication date: March 5, 2009
    Inventors: Jeng-Kuang Hwang, Yu-Lun Chiu
  • Publication number: 20080292009
    Abstract: 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: Application
    Filed: July 11, 2007
    Publication date: November 27, 2008
    Applicant: CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY, ARMAMENTS BUREAU, M.N.D.
    Inventors: Juinn-Hurng Deng, Jeng-Kuang Hwang, Yu-Min Chuang
  • Publication number: 20080125046
    Abstract: 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: Application
    Filed: November 27, 2006
    Publication date: May 29, 2008
    Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang, Po-Tien Lee, Fu-Chin Shau
  • Publication number: 20070133659
    Abstract: 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: Application
    Filed: October 12, 2006
    Publication date: June 14, 2007
    Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang, Po-Tien Lee, Fu-Chin Shau
  • Publication number: 20070104286
    Abstract: 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: Application
    Filed: November 8, 2005
    Publication date: May 10, 2007
    Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang
  • Publication number: 20070104287
    Abstract: 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: Application
    Filed: November 9, 2005
    Publication date: May 10, 2007
    Inventors: Juinn-Horng Deng, Jeng-Kuang Hwang, Po-Tien Lee, Fu-Chin Shau
  • Patent number: 6658261
    Abstract: 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: Grant
    Filed: August 20, 2002
    Date of Patent: December 2, 2003
    Assignee: AT&T Corp.
    Inventors: Jack Harriman Winters, Jeng-Kuang Hwang