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公开(公告)号：US11575350B2
公开(公告)日：2023-02-07
申请号：US16499806
申请日：2017-04-05
Applicant: Nokia Solutions and Networks Oy
Inventor： Shavantha Kularatna , Aki Heikki Jalmari Korhonen , Christian Reichl
Abstract: Various communication devices may benefit from the appropriate use of modeling techniques. For example, devices that include components that may be driven into non-linear ranges of operation may benefit from low complexity non-linear modelling techniques. Such devices may be used, for example, in wireless communication systems. A method can include obtaining a sample of a signal representative of power consumed by a device while the device is operating in a non-linear range while being driven according to a driving signal. The method can also include computing a correction to the driving signal based on the sample. The correction can be calculated based on a plurality of non-overlapped non-linear sections corresponding to a response of the device. The method can further include applying the correction to adjust the driving signal. The correction can be configured to adjust the power to a desired value of power.
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公开(公告)号：US12143135B2
公开(公告)日：2024-11-12
申请号：US17768777
申请日：2019-10-22
Applicant: NOKIA SOLUTIONS AND NETWORKS OY
Inventor： Shavantha Kularatna , Ramasamy Gopalan , Yared Melese
Abstract: A method, apparatus and computer program product is disclosed. The apparatus may comprise means for providing a model for a system for mitigating unwanted effects in a received signal and a means for determining a first curve, acorr, by performing autocorrelation of the model. The apparatus may also comprise means for determining a second curve, Xcorrenv, by performing cross-correlation of the model and a received signal comprising unwanted components due to first and second sources and means for estimating first and second delays associated with respective first and second sources based on the first and second curves, acorr, Xcorrenv. The unwanted effects in the received signal may be PIM products/components, but the disclosure is not limited to PIM alone, and embodiments may be used to mitigate or compute peaks in any interfering scenario where peaks may be hidden.
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公开(公告)号：US12034470B2
公开(公告)日：2024-07-09
申请号：US17511191
申请日：2021-10-26
Applicant: Nokia Solutions and Networks Oy
Inventor： Tian He , Chad Young , Shavantha Kularatna
CPC classification number: H04B1/62 , H04B1/0078 , H04B1/0458 , H04B2001/0408
Abstract: An apparatus is disclosed, comprising means for providing two or more amplifiers for amplifying signals in two or more respective frequency bands, receiving a composite signal comprising first and second predistorted input signals in first and second frequency bands and filtering the composite signal to provide (i) the first predistorted signal for input to a first amplifier of the two or more amplifiers for producing an amplified first output signal and (ii) the second predistorted signal for input to a second amplifier of the two or more amplifiers for producing an amplified second output signal. The apparatus may also comprise means for routing, at non-overlapping times, the first and second output signals to a common feedback path and for linearizing received first and second input signals based on the respective first and second output signals received on the common feedback path.
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公开(公告)号：US11942980B2
公开(公告)日：2024-03-26
申请号：US17627055
申请日：2019-07-16
Applicant: NOKIA SOLUTIONS AND NETWORKS OY
Inventor： Ramasamy Gopalan , Shavantha Kularatna , Artur Drozdz
Abstract: An apparatus is disclosed, comprising means for determining a noise floor for a radio frequency (RF) system. The apparatus may also comprise means for determining a Passive InterModulation (PIM) value of a component of the RF system contributing as a source of PIM; determining that a passive intermodulation (PIM) cancellation system should be enabled if the PIM value is above a predetermined threshold from the noise floor. The apparatus may also comprise means for determining that the PIM cancellation system should be disabled if the PIM value is at or below the predetermined threshold.
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公开(公告)号：US09755583B2
公开(公告)日：2017-09-05
申请号：US15026324
申请日：2014-10-01
Applicant: Nokia Solutions and Networks Oy
Inventor： Shavantha Kularatna , Christian Reichl , Bjoern Jelonnek , Alan Pereira , Glenn Schedeen , Sandeep Mehta
CPC classification number: H03F1/3247 , H03F1/02 , H03F3/19 , H03F3/195 , H03F3/21 , H03F3/213 , H03F3/24 , H03F2200/336 , H03F2200/451 , H03F2201/3227 , H04B1/0475 , H04B1/40 , H04B2001/0416 , H04B2001/045
Abstract: Enhancing the intermodulation performance of an RF power amplifier by determining a coarse time delay represented by an integer TI; determining a reference point for a transmitted signal waveform of the RF power amplifier; shifting the waveform by a set of offsets including a plurality of non-integer fractional steps; correlating the transmitted signal waveform with a feedback signal waveform to obtain a respective correlation value for each of corresponding fractional steps; obtaining an accurate fractional delay value by selecting a fractional step having a highest respective correlation value; applying the obtained correct fractional delay value to the transmitted signal waveform to provide a compensated transmitted signal waveform and combining the compensated transmitted signal waveform with the feedback signal waveform to reduce at least one intermodulation product of the RF power amplifier.
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Patent Agency Ranking
公开(公告)号：US12212353B2
公开(公告)日：2025-01-28
申请号：US18351623
申请日：2023-07-13
Applicant: Nokia Solutions and Networks Oy
Inventor： Chad Young , Tian He , Shavantha Kularatna , Peter Novak , Jacob Edward Longwell
Abstract: As solution for predistorting a signal is presented. The solution comprises receiving (600) as an input a signal comprising at least two signal components on a different band, sampling (602) the input signal comprising linear terms, composite non-linear terms causing intermodulation outside Nyquist band of the input signal and further non-linear terms causing intermodulation inside the Nyquist band, the further non-linear terms comprising multi-band terms. Oversampling (604) by a given factor is applied to the signal in a first predistortion circuit for processing the linear terms and composite non-linear terms causing intermodulation outside Nyquist band; processing (606) the input signal without oversampling in a second predistortion circuit in parallel with the first predistortion circuit for the further non-linear terms. The rates of the output signals of the predistortion circuits are matched (608), combined and filtered (610).
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公开(公告)号：US20230142639A1
公开(公告)日：2023-05-11
申请号：US17768777
申请日：2019-10-22
Applicant: NOKIA SOLUTIONS AND NETWORKS OY
Inventor： Shavantha Kularatna , Ramasamy Gopalan , Yared Melese
CPC classification number: H04B1/123 , H04B1/1027
Abstract: A method, apparatus and computer program product is disclosed. The apparatus may comprise means for providing a model for a system for mitigating unwanted effects in a received signal and a means for determining a first curve, acorr, by performing autocorrelation of the model. The apparatus may also comprise means for determining a second curve, Xcorrenv, by performing cross-correlation of the model and a received signal comprising unwanted components due to first and second sources and means for estimating first and second delays associated with respective first and second sources based on the first and second curves, acorr, Xcorrenv. The unwanted effects in the received signal may be PIM products/components, but the disclosure is not limited to PIM alone, and embodiments may be used to mitigate or compute peaks in any interfering scenario where peaks may be hidden.
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公开(公告)号：US09226189B1
公开(公告)日：2015-12-29
申请号：US14462035
申请日：2014-08-18
Applicant: Nokia Solutions and Networks Oy
Inventor： Shavantha Kularatna , Christian Reichl , Bjoern Jelonnek , Alan Pereira
CPC classification number: H04B17/17
Abstract: At a current time, a current intermodulation content of a predistortion system is determined. An intermodulation ratio is determined using the current intermodulation content and a previous intermodulation content for the predistortion system. The previous intermodulation content is determined at a time previous to the current time. The determined intermodulation ratio is compared with stored intermodulation ratios. A warning is communicated in response to the comparing indicating the predistortion system is unhealthy. Apparatus and computer program products are also disclosed.
Abstract translation: 在当前时间，确定预失真系统的当前互调内容。 使用当前的互调内容和用于预失真系统的先前的互调内容来确定互调比。 先前的互调内容是在当前时间之前的时间确定的。 将确定的互调比与存储的互调比进行比较。 响应于比较表示预失真系统是不健康的，通知警告。 还公开了装置和计算机程序产品。
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9.发明授权公开(公告)号：US09054652B2
公开(公告)日：2015-06-09
申请号：US14044385
申请日：2013-10-02
Applicant: Nokia Solutions and Networks Oy
Inventor： Shavantha Kularatna , Christian Reichl , Bjoern Jelonnek , Glenn Schedeen , Sandeep Mehta
CPC classification number: H03F1/3247 , H03F1/02 , H03F3/19 , H03F3/195 , H03F3/21 , H03F3/213 , H03F3/24 , H03F2200/336 , H03F2200/451 , H03F2201/3227 , H04B1/0475 , H04B1/40 , H04B2001/0416 , H04B2001/045
Abstract: Enhancing the intermodulation performance of an RF power amplifier by determining a coarse time delay represented by an integer T1; determining a reference point for a transmitted signal waveform of the RF power amplifier; shifting the waveform by a set of offsets comprising a plurality of non-integer fractional steps from (T1−Xd) to (T1+Xd) where T1 is the integer and Xd is a non-integer fractional step size value for defining fractional steps about the integer T1 such that the non-integer fractional steps progress in a positive direction as well as a negative direction; correlating the transmitted signal waveform with a feedback signal waveform to obtain a respective correlation value for each of corresponding fractional steps; obtaining an accurate fractional delay value by selecting a fractional step having a highest respective correlation value; applying the obtained correct fractional delay value to the transmitted signal waveform to provide a compensated transmitted signal waveform, and combining the compensated transmitted signal waveform with the feedback signal waveform to reduce at least one intermodulation product of the RF power amplifier.
Abstract translation: 通过确定由整数T1表示的粗略时间延迟来增强RF功率放大器的互调性能; 确定RF功率放大器的发射信号波形的参考点; 将波形移位一组包括从（T1-Xd）到（T1 + Xd）的多个非整数分数步长的偏移量，其中T1是整数，Xd是用于定义分数步长的非整数分数步长值 整数T1使得非整数分数步骤在正方向和负方向上进行; 将发送的信号波形与反馈信号波形相关，以获得每个相应分数步骤的相应相关值; 通过选择具有最高各自的相关值的分数步骤来获得精确的分数延迟值; 将所获得的正确分数延迟值应用于所发送的信号波形以提供经补偿的发送信号波形，以及将经补偿的发送信号波形与反馈信号波形组合以减少RF功率放大器的至少一个互调乘积。
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10.发明申请公开(公告)号：US20150091643A1
公开(公告)日：2015-04-02
申请号：US14044385
申请日：2013-10-02
Applicant: Nokia Solutions and Networks Oy
Inventor： Shavantha Kularatna , Christian Reichl , Bjoern Jelonnek , Glenn Schedeen , Sandeep Mehta
CPC classification number: H03F1/3247 , H03F1/02 , H03F3/19 , H03F3/195 , H03F3/21 , H03F3/213 , H03F3/24 , H03F2200/336 , H03F2200/451 , H03F2201/3227 , H04B1/0475 , H04B1/40 , H04B2001/0416 , H04B2001/045
Abstract: Enhancing the intermodulation performance of an RF power amplifier by determining a coarse time delay represented by an integer T1; determining a reference point for a transmitted signal waveform of the RF power amplifier; shifting the waveform by a set of offsets comprising a plurality of non-integer fractional steps from (T1−Xd) to (T1+Xd) where T1 is the integer and Xd is a non-integer fractional step size value for defining fractional steps about the integer T1 such that the non-integer fractional steps progress in a positive direction as well as a negative direction; correlating the transmitted signal waveform with a feedback signal waveform to obtain a respective correlation value for each of corresponding fractional steps; obtaining an accurate fractional delay value by selecting a fractional step having a highest respective correlation value; applying the obtained correct fractional delay value to the transmitted signal waveform to provide a compensated transmitted signal waveform, and combining the compensated transmitted signal waveform with the feedback signal waveform to reduce at least one intermodulation product of the RF power amplifier.
Abstract translation: 通过确定由整数T1表示的粗略时间延迟来增强RF功率放大器的互调性能; 确定RF功率放大器的发射信号波形的参考点; 将波形移位一组包括从（T1-Xd）到（T1 + Xd）的多个非整数分数步长的偏移量，其中T1是整数，Xd是用于定义分数步长的非整数分数步长值 整数T1使得非整数分数步骤在正方向和负方向上进行; 将发送的信号波形与反馈信号波形相关，以获得每个相应分数步骤的相应相关值; 通过选择具有最高各自的相关值的分数步骤来获得精确的分数延迟值; 将所获得的正确分数延迟值应用于所发送的信号波形以提供经补偿的发送信号波形，以及将经补偿的发送信号波形与反馈信号波形组合以减少RF功率放大器的至少一个互调乘积。
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