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1. 发明公开

EP1446871A1 DIGITAL LINEARIZATION CIRCUIT 有权
标题翻译：数字电路线性化
公开(公告)号：EP1446871A1
公开(公告)日：2004-08-18
申请号：EP02780232.1
申请日：2002-10-29
申请人： Telefonaktiebolaget LM Ericsson (publ)
发明人： SAHLMAN, Karl-Gösta
IPC分类号： H03F1/26
CPC分类号： H03F1/3258 , H03F1/3247 , H03F2201/3209
摘要： A solution is disclosed for achieving a functional complex base-band adaptive digital nonlinear device model providing RF-power amplifier distortion (i.e. linearization or pre-distortion) minimizing distortion characterization including memory effects. The present inventive solution is based on real device non-linear performance observations and the physical cause for the distortion is compensated in the application. This also means that a pre-distorter digital circuit is derived to have the inverse functionality of the digital device model. The model and the digital pre-distortion circuit are designed in such way, that function blocks are connected in cascade. Each function block is then designed to handle a certain type of distortion performance and can be optimized individually. The model gives possibilities to describe and evaluate different device properties. An accurate AM to AM and AM to PM characterization can be evaluated and the frequency response of the device when excited with envelope-modulated signals can be evaluated. The properties evaluated can also be used in a test procedure in a production facility to verify production quality.

2. 发明授权

EP2789105B1 HETERODYNE RECEIVER STRUCTURE, MULTI CHIP MODULE, MULTI INTEGRATED CIRCUIT MODULE, AND METHOD FOR PROCESSING A RADIO FREQUENCY SIGNAL 有权
标题翻译：干扰接收器结构，更多的芯片MODULE多个集成电路MODULE AND METHOD FOR处理的射频信号
公开(公告)号：EP2789105B1
公开(公告)日：2016-04-20
申请号：EP12855394.8
申请日：2012-02-07
申请人： Telefonaktiebolaget LM Ericsson (publ)
发明人： SAHLMAN, Karl-Gösta , LIEBACK, Tomas
IPC分类号： H04B1/06 , H03D7/18 , H04B1/00 , H03M1/12
CPC分类号： H03D7/18 , H04B1/0021 , H04B1/0046 , H04B1/06

3. 发明公开

EP1446872A1 NON-LINEAR MODELING METHOD 有权
标题翻译：方法非线性建模
公开(公告)号：EP1446872A1
公开(公告)日：2004-08-18
申请号：EP02803140.9
申请日：2002-10-29
申请人： Telefonaktiebolaget LM Ericsson (publ)
发明人： SAHLMAN, Karl-Gösta
IPC分类号： H03F1/26
CPC分类号： H03F1/3247 , H03F1/3258
摘要： In the present invention a completely different approach for modeling of non-linear devices or processes is used. A cascade of blocks each depending on a non-linearity parameter are utilized both in non-linear modeling and a pre-distorter design. The new non-linear model description can be used for characterization of a non -linear system or for linearizing a non -linear system. Application to a Communications System Multi-carrier Amplifier is shown as an application example. Also for other application areas of the new mathematical method is feasible echo-canceling, non-linear communications channels etc. Parameter extractions and tables for the new model do not give multiple dimensional mathematical solutions for parameter extractions as in prior art.

4. 发明授权

EP1446871B1 DIGITAL LINEARIZATION CIRCUIT 有权
标题翻译：数字电路线性化
公开(公告)号：EP1446871B1
公开(公告)日：2008-09-10
申请号：EP02780232.1
申请日：2002-10-29
申请人： TELEFONAKTIEBOLAGET LM ERICSSON (publ)
发明人： SAHLMAN, Karl-Gösta
IPC分类号： H03F1/26
CPC分类号： H03F1/3258 , H03F1/3247 , H03F2201/3209
摘要： A solution is disclosed for achieving a functional complex base-band adaptive digital nonlinear device model providing RF-power amplifier distortion (i.e. linearization or pre-distortion) minimizing distortion characterization including memory effects. The present inventive solution is based on real device non-linear performance observations and the physical cause for the distortion is compensated in the application. This also means that a pre-distorter digital circuit is derived to have the inverse functionality of the digital device model. The model and the digital pre-distortion circuit are designed in such way, that function blocks are connected in cascade. Each function block is then designed to handle a certain type of distortion performance and can be optimized individually. The model gives possibilities to describe and evaluate different device properties. An accurate AM to AM and AM to PM characterization can be evaluated and the frequency response of the device when excited with envelope-modulated signals can be evaluated. The properties evaluated can also be used in a test procedure in a production facility to verify production quality.

5. 发明公开

EP2789105A1 HETERODYNE RECEIVER STRUCTURE, MULTI CHIP MODULE, MULTI INTEGRATED CIRCUIT MODULE, AND METHOD FOR PROCESSING A RADIO FREQUENCY SIGNAL 有权
标题翻译：干扰接收器结构，更多的芯片MODULE多个集成电路MODULE AND METHOD FOR处理的射频信号
公开(公告)号：EP2789105A1
公开(公告)日：2014-10-15
申请号：EP12855394.8
申请日：2012-02-07
申请人： Telefonaktiebolaget LM Ericsson (PUBL)
发明人： SAHLMAN, Karl-Gösta , LIEBACK, Tomas
IPC分类号： H04B1/06 , H03H17/06 , H03D7/18 , H03M1/12
CPC分类号： H03D7/18 , H04B1/0021 , H04B1/0046 , H04B1/06
摘要： A heterodyne receiver structure comprises a frequency conversion block arranged to convert an incoming analogue radio frequency (RF) signal to an analogue intermediate frequency (IF) signal; a filter block arranged to filter said analogue IF signal; and an analogue-to-digital (AD) converter block arranged to convert said filtered analogue IF signal to a digital signal, wherein the AD converter block (309) is arranged to convert the filtered analogue IF signal to the digital signal by using a sampling frequency (fs) which is at least N times a maximum bandwidth of the filtered analogue IF signal, wherein the frequency spectrum from zero to the sampling frequency is divided into N frequency zones of equal width, wherein N is an even positive number higher than two; the frequency conversion block (304) is arranged to convert the incoming analogue RF signal to the analogue IF signal such that the analogue IF signal is located in any of the N/2-1 frequency zones having lowest frequency; and the filter block (306-308) is arranged to low pass the analogue IF signal such that any disturbing signal located in a zone, which would have a mirror image after the AD conversion in the zone, in which the analogue IF signal is located, is filtered away, wherein the heterodyne receiver structure further comprises a digital signal processing block (311) arranged to filter said digital signal.

6. 发明公开

EP2561724A1 METHOD TO GET A FREQUENCY REFERENCE TO A BASE STATION 审中-公开
标题翻译：程序频率给定的到基站释放
公开(公告)号：EP2561724A1
公开(公告)日：2013-02-27
申请号：EP10850342.6
申请日：2010-04-21
申请人： Telefonaktiebolaget LM Ericsson (publ)
发明人： SKÄRBY, Ulf , SAHLMAN, Karl-Gösta
IPC分类号： H04W88/08 , H04B7/08 , H04L7/033
CPC分类号： H04L27/16 , H04L27/066 , H04L2027/0044 , H04W88/085
摘要： The present solution relates to a method in a base station (110) for generating radio frequency. The base station (110) comprises a base station unit (125) connected to a tower mounted amplifier (122) via a feeder (127). A signal from the base station unit (125) is received, via a serial interface over the feeder (127), in the tower mounted amplifier (122). A frequency reference signal is extracted from the received signal. The extracted frequency reference signal is provided to a radio frequency synthesizer (210). The radio frequency synthesizer (210) is comprised in the tower mounted amplifier (122). A radio frequency is generated in the radio frequency synthesizer (210) using the extracted reference signal.

7. 发明公开

EP2127131A1 RADIO COMMUNICATIONS USING SCHEDULED POWER AMPLIFIER BACKOFF 审中-公开
标题翻译： FUNKKOMMUNIKATON使用EINGEPLANTEM功率放大器倒转
公开(公告)号：EP2127131A1
公开(公告)日：2009-12-02
申请号：EP07748385.7
申请日：2007-04-10
申请人： Telefonaktiebolaget LM Ericsson (publ)
发明人： SAHLMAN, Karl-Gösta , SKÄRBY, Ulf
IPC分类号： H04B7/005 , H04L27/26 , H03F1/02 , H03G3/30
CPC分类号： H04B1/0475 , H04B2001/0416 , H04W52/241 , H04W52/245
摘要： Radio transmissions to multiple radio terminals are improved using scheduled backoff of a multi-signal power amplifier. A radio channel quality associated with each of the radio terminals is determined. First signals for first radio terminals associated with a better channel quality are amplified by a power amplifier during a first time period resulting in a first composite output signal. Second signals for second radio terminals associated with a lower channel quality are amplified by the power amplifier during a second time period resulting in a second composite output signal. Transmission during the first time period occurs at a first power level, e.g., mean power, that is associated with a lower probability of clipping the first composite output signal. During the second time period, the second composite signal is transmitted at a second power level, e.g., mean power, higher than the first power level which improves reception at the second terminals.

8. 发明公开

EP2052510A1 METHOD AND ARRANGEMENT RELATING TO THE INSERTION OF PILOT TONES IN THE FREQUENCY DOMAIN IN SC-FDMA 审中-公开
标题翻译：方法和装置有关的频率范围内插入导频信号在SC-FDMA
公开(公告)号：EP2052510A1
公开(公告)日：2009-04-29
申请号：EP06769667.4
申请日：2006-08-18
申请人： TELEFONAKTIEBOLAGET LM ERICSSON (publ)
发明人： SAHLMAN, Karl-Gösta
IPC分类号： H04L27/26
CPC分类号： H04L5/0007 , H04L5/0048 , H04L5/0058 , H04L27/2618 , H04L27/2636
摘要： The present invention relates to a method and arrangement for enhancing efficiency of transmission using Single Channel-Frequency Division Multiple Access (SC-FDMA). The method comprises the step of: applying a Discrete Fourier Transformation (DFT) of time signal providing No samples in a first resulting signal, inserting N1 pilot tones in said resulting signal providing No+N1 tones, Interpolating said signal provided with No+N1 tones to a required size, N, by insertion of zero bins in a middle section of said DFT providing a modified signal, applying Inversed Fast Fourier Transform (IFFT) on said modified signal, and performing a cyclic prefix insertion before transmitting the modified signal. Thus, similar equalizing techniques as for OFDM are possible for efficacy signal reception.

9. 发明授权

EP1446872B1 NON-LINEAR MODELING METHOD 有权
标题翻译：方法非线性建模
公开(公告)号：EP1446872B1
公开(公告)日：2006-06-21
申请号：EP02803140.9
申请日：2002-10-29
申请人： TELEFONAKTIEBOLAGET LM ERICSSON (publ)
发明人： SAHLMAN, Karl-Gösta
IPC分类号： H03F1/26
CPC分类号： H03F1/3247 , H03F1/3258
摘要： In the present invention a completely different approach for modeling of non-linear devices or processes is used. A cascade of blocks each depending on a non-linearity parameter are utilized both in non-linear modeling and a pre-distorter design. The new non-linear model description can be used for characterization of a non -linear system or for linearizing a non -linear system. Application to a Communications System Multi-carrier Amplifier is shown as an application example. Also for other application areas of the new mathematical method is feasible echo-canceling, non-linear communications channels etc. Parameter extractions and tables for the new model do not give multiple dimensional mathematical solutions for parameter extractions as in prior art.

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