Patents by Inventor Qingzhong Jiao
Qingzhong Jiao 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: 8873675Abstract: A transmitter for a mobile device utilizes at least one mapper to improve power efficiency while still meeting out of band spurious emissions and waveform quality requirements. An encoder and modulator generates an encoded and modulated transmit signal from an input signal and a DAC then generates an analog representation of the encoded and modulated transmit signal. An amplifier stage coupled to the DAC amplifies the analog representation of the encoded and modulated transmit signal to generate a transmission signal. The transmitter further comprises an amplifier control block that generates an amplifier control signal to adjust at least one parameter of the amplifier stage. The amplifier control block includes at least one mapper to determine the amplifier control signal based on a peak to average power ratio and an average transmit power of the transmission signal. Environmental and operating conditions of the transmitter may be accounted for in the mappers.Type: GrantFiled: March 14, 2013Date of Patent: October 28, 2014Assignee: BlackBerry LimitedInventors: Wen-Yen Chan, Qingzhong Jiao, Xin Jin, Nasserullah Khan
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Patent number: 8670503Abstract: A power management system and method for a wireless communication device generates an average desired transmit power signal based on at least one of a received signal strength indicator signal and a power control instruction signal from a base station. A power supply level adjustment signal is generated based on the data parameters of an outgoing data stream and at least one environmental information signal. A combination of the power supply level adjustment signal and the average desired transmit power or a gain control signal and an altered version of the power supply level adjustment signal is used to generate a variable power supply signal that is provided to an output amplifier block for sufficiently generating outgoing wireless device radio signals while reducing power loss in the output amplifier block.Type: GrantFiled: September 5, 2012Date of Patent: March 11, 2014Assignee: BlackBerry LimitedInventors: Wen-Yen Chan, Nasserullah Khan, Michael Habicher, Nagula Tharma Sangary, Qingzhong Jiao, Xin Jin
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Patent number: 8626094Abstract: It has now been found that in some transmitter implementations which transmit multiple code channels, for example CDMA transmitters, the observed power for each code channel at the output relative to the other code channels is dependent upon the total transmit power due to non-linearities in the transmitter. Methods and apparatus are provided which use pre-set digital gains or digital gain adjustments to compensate for the non-linearities as a function of total transmit power such that at the output, the desired relative powers are observed.Type: GrantFiled: January 28, 2013Date of Patent: January 7, 2014Assignee: BlackBerry LimitedInventors: Xin Jin, Qingzhong Jiao, Wen Zhao
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Patent number: 8571505Abstract: A technique for controlling operation of a communication subsystem is described. The subsystem is set to a first wake-up mode of operation, during which a state value from the system is read and stored in memory. The subsystem is then set to a sleep mode of operation after the first wake-up mode of operation, and to a second wake-up mode of operation after the sleep mode of operation. The stored state value is then read from the memory, where the subsystem is set to operate based on the read state value during a warm-up period of the second wake-up mode of operation.Type: GrantFiled: August 29, 2012Date of Patent: October 29, 2013Assignee: Blackberry LimitedInventors: Xin Jin, Qingzhong Jiao, Tom Yun Sang Young
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Publication number: 20130273863Abstract: A transmitter for a mobile device utilizes at least one mapper to improve power efficiency while still meeting out of band spurious emissions and waveform quality requirements. An encoder and modulator generates an encoded and modulated transmit signal from an input signal and a DAC then generates an analog representation of the encoded and modulated transmit signal. An amplifier stage coupled to the DAC amplifies the analog representation of the encoded and modulated transmit signal to generate a transmission signal. The transmitter further comprises an amplifier control block that generates an amplifier control signal to adjust at least one parameter of the amplifier stage. The amplifier control block includes at least one mapper to determine the amplifier control signal based on a peak to average power ratio and an average transmit power of the transmission signal. Environmental and operating conditions of the transmitter may be accounted for in the mappers.Type: ApplicationFiled: March 14, 2013Publication date: October 17, 2013Inventors: Wen-Yen CHAN, Qingzhong JIAO, Xin JIN, Nasserullah KHAN
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Patent number: 8477878Abstract: A communications subsystem for a wireless device for correcting errors in a reference frequency signal. The communications subsystem comprises a frequency generator for generating the reference frequency signal and a closed loop reference frequency correction module that generates a reference frequency adjustment signal for correcting the reference frequency signal when the communications subsystem operates in closed loop mode. The subsystem further includes an open loop frequency correction means that that samples values of the reference frequency adjustment signal during the closed loop mode and generates a frequency correction signal for correcting the reference frequency signal when the communications subsystem operates in a mode other than closed loop mode.Type: GrantFiled: September 13, 2012Date of Patent: July 2, 2013Assignee: Research In Motion LimitedInventors: Wen-Yen Chan, Nasserullah Khan, Nagula Tharma Sangary, Qingzhong Jiao, Xin Jin
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Patent number: 8428181Abstract: A transmitter for a mobile device utilizes at least one mapper in order to improve power efficiency while still meeting out of band spurious emissions and waveform quality requirements. An encoder and modulator generates an encoded and modulated transmit signal from an input signal. A digital to analog converter coupled to the encoder and modulator generates an analog representation of the encoded and modulated transmit signal. An amplifier stage coupled to the digital to analog converter amplifies the analog representation of the encoded and modulated transmit signal to generate a transmission signal. The transmitter further comprises an amplifier control block configured to generate an amplifier control signal for adjusting at least one parameter of the amplifier stage. At least one mapper is provided in the amplifier control block, used to determine the amplifier control signal based on a peak to average power ratio and an average transmit power of the transmission signal.Type: GrantFiled: May 21, 2010Date of Patent: April 23, 2013Assignee: Research In Motion LimitedInventors: Wen-Yen Chan, Nasserullah Khan, Xin Jin, Qingzhong Jiao
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Patent number: 8385862Abstract: It has now been found that in some transmitter implementations which transmit multiple code channels, for example CDMA transmitters, the observed power for each code channel at the output relative to the other code channels is dependent upon the total transmit power due to non-linearities in the transmitter. Methods and apparatus are provided which use pre-set digital gains or digital gain adjustments to compensate for the non-linearities as a function of total transmit power such that at the output, the desired relative powers are observed.Type: GrantFiled: November 30, 2011Date of Patent: February 26, 2013Assignee: Research In Motion LimitedInventors: Xin Jin, Wen Zhao, Qingzhong Jiao
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Publication number: 20130016800Abstract: A communications subsystem for a wireless device for correcting errors in a reference frequency signal. The communications subsystem comprises a frequency generator for generating the reference frequency signal and a closed loop reference frequency correction module that generates a reference frequency adjustment signal for correcting the reference frequency signal when the communications subsystem operates in closed loop mode. The subsystem further includes an open loop frequency correction means that that samples values of the reference frequency adjustment signal during the closed loop mode and generates a frequency correction signal for correcting the reference frequency signal when the communications subsystem operates in a mode other than closed loop mode.Type: ApplicationFiled: September 13, 2012Publication date: January 17, 2013Applicant: RESEARCH IN MOTION LIMITEDInventors: Wen-Yen CHAN, Xin JIN, Qingzhong JIAO, Nasserullah KHAN, Nagula Tharma SANGARY
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Publication number: 20120329411Abstract: A power management system and method for a wireless communication device generates an average desired transmit power signal based on at least one of a received signal strength indicator signal and a power control instruction signal from a base station. A power supply level adjustment signal is generated based on the data parameters of an outgoing data stream and at least one environmental information signal. A combination of the power supply level adjustment signal and the average desired transmit power or a gain control signal and an altered version of the power supply level adjustment signal is used to generate a variable power supply signal that is provided to an output amplifier block for sufficiently generating outgoing wireless device radio signals while reducing power loss in the output amplifier block.Type: ApplicationFiled: September 5, 2012Publication date: December 27, 2012Applicant: RESEARCH IN MOTION LIMITEDInventors: Wen-Yen CHAN, Nasserullah KHAN, Qingzhong JIAO, Xin JIN, Michael HABICHER, Nagula Tharma SANGARY
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Publication number: 20120322397Abstract: A technique for controlling operation of a communication subsystem is described. The subsystem is set to a first wake-up mode of operation, during which a state value from the system is read and stored in memory. The subsystem is then set to a sleep mode of operation after the first wake-up mode of operation, and to a second wake-up mode of operation after the sleep mode of operation. The stored state value is then read from the memory, where the subsystem is set to operate based on the read state value during a warm-up period of the second wake-up mode of operation.Type: ApplicationFiled: August 29, 2012Publication date: December 20, 2012Applicant: RESEARCH IN MOTION LIMITEDInventors: Xin Jin, Qingzhong Jiao, Tom Yun Sang Young
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Patent number: 8295403Abstract: A communications subsystem for a wireless device for correcting errors in a reference frequency signal. The communications subsystem comprises a frequency generator for generating the reference frequency signal and a closed loop reference frequency correction module that generates a reference frequency adjustment signal for correcting the reference frequency signal when the communications subsystem operates in closed loop mode. The subsystem further includes an open loop frequency correction means that that samples values of the reference frequency adjustment signal during the closed loop mode and generates a frequency correction signal for correcting the reference frequency signal when the communications subsystem operates in a mode other than closed loop mode.Type: GrantFiled: January 30, 2009Date of Patent: October 23, 2012Assignee: Research In Motion LimitedInventors: Wen-Yen M. Chan, Xin Jin, Qingzhong Jiao, Nasserullah Khan, Nagula Tharma Sangary
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Patent number: 8290085Abstract: A power management system and method for a wireless communication device generates an average desired transmit power signal based on at least one of a received signal strength indicator signal and a power control instruction signal from a base station. A power supply level adjustment signal is generated based on the data parameters of an outgoing data stream and at least one environmental information signal. A combination of the power supply level adjustment signal and the average desired transmit power or a gain control signal and an altered version of the power supply level adjustment signal is used to generate a variable power supply signal that is provided to an output amplifier block for sufficiently generating outgoing wireless device radio signals while reducing power loss in the output amplifier block.Type: GrantFiled: July 28, 2011Date of Patent: October 16, 2012Assignee: Research In Motion LimitedInventors: Wen-Yen Chan, Nasserullah Khan, Xin Jin, Nagula Tharma Sangary, Michael Franz Habicher, Qingzhong Jiao
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Patent number: 8275335Abstract: A communication device reads and stores in memory a state value which was utilized for operating a communication subsystem during a wake-up period of the communication subsystem. The device then causes the communication subsystem to enter into a sleep mode. Subsequently, the device causes the communication subsystem to exit from the sleep mode and enter into a current wake-up period. The stored state value is provided to the communication subsystem for use in operating the communication subsystem during a warm-up period of the current wake-up period. After the warm-up period of the current wake up period, a current state value is provided from a state controller to the communication subsystem for use in operating the communication subsystem during the wake up period. The current state value is determined based on a detected signal level of a current signal received in the communication subsystem.Type: GrantFiled: December 1, 2011Date of Patent: September 25, 2012Assignee: Research In Motion LimitedInventors: Xin Jin, Qingzhong Jiao, Tom Yun Sang Young
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Publication number: 20120142299Abstract: A communication device reads and stores in memory a state value which was utilized for operating a communication subsystem during a wake-up period of the communication subsystem. The device then causes the communication subsystem to enter into a sleep mode. Subsequently, the device causes the communication subsystem to exit from the sleep mode and enter into a current wake-up period. The stored state value is provided to the communication subsystem for use in operating the communication subsystem during a warm-up period of the current wake-up period. After the warm-up period of the current wake up period, a current state value is provided from a state controller to the communication subsystem for use in operating the communication subsystem during the wake up period. The current state value is determined based on a detected signal level of a current signal received in the communication subsystem.Type: ApplicationFiled: December 1, 2011Publication date: June 7, 2012Applicant: RESEARCH IN MOTION LIMITEDInventors: Xin Jin, Qingzhong Jiao, Tom Yun Sang Young
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Publication number: 20120069929Abstract: It has now been found that in some transmitter implementations which transmit multiple code channels, for example CDMA transmitters, the observed power for each code channel at the output relative to the other code channels is dependent upon the total transmit power due to non-linearities in the transmitter. Methods and apparatus are provided which use pre-set digital gains or digital gain adjustments to compensate for the non-linearities as a function of total transmit power such that at the output, the desired relative powers are observed.Type: ApplicationFiled: November 30, 2011Publication date: March 22, 2012Applicant: RESEARCH IN MOTION LIMITEDInventors: Xin Jin, Wen ZHAO, Qingzhong JIAO
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Patent number: 8131292Abstract: A method and apparatus for improved timer based registration for a mobile device with a network, the network having a standard slot cycle time for interrupts, the method comprising the steps of: receiving, at the mobile device, a system parameter message from the network, the message having a value indicating a frequency for periodic registration; setting a timer value on a timer at the mobile device, the timer value being greater than the standard slot cycle time; setting a counter to count expiration of the timer; starting the timer; upon expiration of the timer, decrementing the counter; upon the counter reaching zero, waiting for a paging slot to communicate with the network; and sending a registration message to the network on the paging slot.Type: GrantFiled: February 22, 2011Date of Patent: March 6, 2012Assignee: Research In Motion LimitedInventors: Qingzhong Jiao, Wen Zhao
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Patent number: 8116712Abstract: Techniques for controlling a gain state of a wireless receiver involve causing the wireless receiver to enter into a sleep mode; causing the wireless receiver to exit from the sleep mode and enter into a wake-up period; providing, via a multiplexer, a stored gain control state value to the wireless receiver for use during a warm-up period of the wake-up period, the stored gain control state value being previously read from a gain controller during a previous wake-up period of the wireless receiver; and after the warm-up period of the wake up period, providing, via the multiplexer, a current gain control state value from the gain controller to the wireless receiver for use during the wake up period, the current gain control state value being based on a signal level of a currently-received signal in the wireless receiver.Type: GrantFiled: November 9, 2010Date of Patent: February 14, 2012Assignee: Research In Motion LimitedInventors: Xin Jin, Qingzhong Jiao, Tom Yun Sang Young
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Patent number: 8098761Abstract: A peak to average power ratio signal is generated from a first mapping function that selects the peak to average power ratio signal that corresponds to the data rate or data format of the signal to be transmitted. The selected peak to average power ratio signal is summed with a desired average transmit power signal. The resulting summation signal is input to a second effectively continuously valued mapping function comprising a table that has a plurality of power amplifier control signal values each with a corresponding peak transmit power. Each peak transmit power signal value results in a power amplifier control signal value that achieves the best possible transmitter power efficiency while still meeting out of band spurious emissions and waveform quality requirements. The summation signal value maps to one of the power amplifier control signal value that is then used to adjust a parameter such as bias of the power amplifier.Type: GrantFiled: November 9, 2010Date of Patent: January 17, 2012Assignee: Research In Motion LimitedInventors: Wen Yen Chan, Xin Jin, Qingzhong Jiao
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Patent number: 8090331Abstract: It has now been found that in some transmitter implementations which transmit multiple code channels, for example CDMA transmitters, the observed power for each code channel at the output relative to the other code channels is dependent upon the total transmit power due to non-linearities in the transmitter. Methods and apparatus are provided which use pre-set digital gains or digital gain adjustments to compensate for the non-linearities as a function of total transmit power such that at the output, the desired relative powers are observed.Type: GrantFiled: February 28, 2011Date of Patent: January 3, 2012Assignee: Research In Motion LimitedInventors: Xin Ju, Wen Zhao, Qingzhong Jiao