公开(公告)号：US08768283B2

公开(公告)日：2014-07-01

申请号：US13823785

申请日：2011-09-16

申请人： Fenghao Mu ,  Lars Sundström ,  Leif Wilhelmsson

发明人： Fenghao Mu ,  Lars Sundström ,  Leif Wilhelmsson

IPC分类号： H04B1/26 ,  H04B1/10

CPC分类号： H04B1/06 ,  H03D7/166 ,  H03D7/18

摘要： The invention relates to a complex intermediate frequency (CIF) mixer stage, methods of operation thereof, and methods of calibration thereof. The CIF mixer stage comprises numerous individual mixers driven by IF clock signals to down-convert received IF signals into a set of signals at baseband frequency which are further combined to form a lower side band signal and an upper side band signal. The IF clock signals used have a predefined phase relationship among them, which involves tuneable phase skews. By calibration of the conversion gains and the phases of the IF clock signals the gain and phase imbalance introduced in a preceding radio frequency mixer stage and/or the CIF mixer stage can be cancelled. Further, in-channel IQ leakage control can be applied to the lower side band signal and/or the upper side band signal. The CIF mixer stage can thus effectively suppress image interference and IQ leakage.

摘要翻译： 本发明涉及复杂中频（CIF）混频器级，其操作方法及其校准方法。 CIF混频器级包括由IF时钟信号驱动的多个单独的混频器，以将接收到的IF信号降频转换成基带频率的一组信号，这些信号进一步组合以形成下边带信号和上边带信号。 所使用的IF时钟信号之间具有预定的相位关系，这涉及到可调相位偏移。 通过校准转换增益和IF时钟信号的相位，可以取消在前一个射频混频器级和/或CIF混频器级中引入的增益和相位不平衡。 此外，信道内IQ泄漏控制可以应用于下边带信号和/或上边带信号。 因此，CIF混频器级可以有效地抑制图像干扰和IQ泄漏。

公开(公告)号：US20130183921A1

公开(公告)日：2013-07-18

申请号：US13823785

申请日：2011-09-16

申请人： Fenghao Mu ,  Lars Sundström ,  Leif Wilhelmsson

发明人： Fenghao Mu ,  Lars Sundström ,  Leif Wilhelmsson

IPC分类号： H04B1/06

CPC分类号： H04B1/06 ,  H03D7/166 ,  H03D7/18

摘要： The invention relates to a complex intermediate frequency (CIF) mixer stage, methods of operation thereof, and methods of calibration thereof. The CIF mixer stage comprises numerous individual mixers driven by IF clock signals to down-convert received IF signals into a set of signals at baseband frequency which are further combined to form a lower side band signal and an upper side band signal. The IF clock signals used have a predefined phase relationship among them, which involves tunable phase skews. By calibration of the conversion gains and the phases of the IF clock signals the gain and phase imbalance introduced in a preceding radio frequency mixer stage and/or the CIF mixer stage can be cancelled. Further, in-channel IQ leakage control can be applied to the lower side band signal and/or the upper side band signal. The CIF mixer stage can thus effectively suppress image interference and IQ leakage.

摘要翻译： 本发明涉及复杂中频（CIF）混频器级，其操作方法及其校准方法。 CIF混频器级包括由IF时钟信号驱动的多个单独的混频器，以将接收到的IF信号降频转换成基带频率的一组信号，这些信号进一步组合以形成下边带信号和上边带信号。 所使用的IF时钟信号之间具有预定的相位关系，这涉及可调节的相位偏差。 通过校准转换增益和IF时钟信号的相位，可以取消在前一个射频混频器级和/或CIF混频器级中引入的增益和相位不平衡。 此外，信道内IQ泄漏控制可以应用于下边带信号和/或上边带信号。 因此，CIF混频器级可以有效地抑制图像干扰和IQ泄漏。

公开(公告)号：US09020077B2

公开(公告)日：2015-04-28

申请号：US13823774

申请日：2011-09-16

申请人： Lars Sundström ,  Fenghao Mu ,  Leif Wilhelmsson

发明人： Lars Sundström ,  Fenghao Mu ,  Leif Wilhelmsson

IPC分类号： H04L27/22 ,  H04B1/16 ,  H03D7/16 ,  H04B1/12

CPC分类号： H04L27/389 ,  H03D7/166 ,  H03D2200/0088 ,  H04B1/126 ,  H04L25/08

摘要： A complex intermediate frequency mixer (IFM) for frequency translating a received complex intermediate frequency, IF, signal, wherein the received complex IF signal comprises at least two frequency bands located at upper-side and lower-side of 0 Hz, is provided. The complex intermediate frequency mixer comprises a first, second, third and fourth mixer (M1, M2, M3, M4). The complex intermediate frequency mixer further comprises a first, second, third and fourth gain adjusting component (α1, α2, δ2, δ1), connected to a first, second, third and fourth mixer output (M1-out, M2-out, M3-out, M4-out), respectively. Moreover, a first summing unit (S1), connected to a first gain output (α1-out), a fourth gain output (δ1-out) and a third mixer output (M3-out) negated, and second summing unit (S2), connected to the second gain output (α2-out), the third gain output (δ2-out) and the fourth mixer output (M4-out), are configured to output a first baseband complex signal of the received complex IF signal.

公开(公告)号：US20130177113A1

公开(公告)日：2013-07-11

申请号：US13823774

申请日：2011-09-16

申请人： Lars Sundström ,  Fenghao Mu ,  Leif Wilhelmsson

发明人： Lars Sundström ,  Fenghao Mu ,  Leif Wilhelmsson

IPC分类号： H04B1/12

CPC分类号： H04L27/389 ,  H03D7/166 ,  H03D2200/0088 ,  H04B1/126 ,  H04L25/08

摘要： A complex intermediate frequency mixer (IFM) for frequency translating a received complex intermediate frequency, IF, signal, wherein the received complex IF signal comprises at least two frequency bands located at upper-side and lower-side of 0 Hz, is provided. The complex intermediate frequency mixer comprises a first, second, third and fourth mixer (M1, M2, M3, M4). The complex intermediate frequency mixer further comprises a first, second, third and fourth gain adjusting component (α1, α2, δ2, δ1), connected to a first, second, third and fourth mixer output (M1-out, M2-out, M3-out, M4-out), respectively. Moreover, a first summing unit (S1), connected to a first gain output (α1-out), a fourth gain output (δ1-out) and a third mixer output (M3-out) negated, and second summing unit (S2), connected to the second gain output (α2-out), the third gain output (δ2-out) and the fourth mixer output (M4-out), are configured to output a first baseband complex signal of the received complex IF signal.

摘要翻译： 一种复合中频混频器（IFM），用于频率转换接收的复合中频IF，信号，其中所接收的复合IF信号包括位于0Hz的上侧和下侧的至少两个频带。 复合中频混频器包括第一，第二，第三和第四混频器（M1，M2，M3，M4）。 复合中频混频器还包括连接到第一，第二，第三和第四混频器输出（M1-out，M2-out，M3）的第一，第二，第三和第四增益调整组件（α1，α2，Δ2，Δ1） -out，M4-out）。 此外，连接到第一增益输出（alpha1-out），第四增益输出（delta1-out）和第三混频器输出（M3-out）的第一求和单元（S1）被否定，以及第二加法单元（S2） ，连接到第二增益输出（alpha2-out），第三增益输出（delta2-out）和第四混频器输出（M4-out），被配置为输出所接收的复合IF信号的第一基带复信号。

公开(公告)号：US09088468B2

公开(公告)日：2015-07-21

申请号：US13354984

申请日：2012-01-20

申请人： Lars Sundström ,  Magnus Nilsson ,  Leif Wilhelmsson

发明人： Lars Sundström ,  Magnus Nilsson ,  Leif Wilhelmsson

IPC分类号： H04L25/06 ,  H04L27/06 ,  H04L27/26 ,  H04L5/00 ,  H04B1/00 ,  H04B1/28 ,  H04B1/403

CPC分类号： H04L27/2649 ,  H04B1/0071 ,  H04B1/0075 ,  H04B1/28 ,  H04B1/403 ,  H04L5/001

摘要： In a dual-carrier, double-conversion Orthogonal Frequency Division Multiplexing (OFDM) receiver a frequency synthesizer generates a first local oscillator signal for the first down-conversions stage of the receiver. A frequency divider is used to derive a second local oscillator signal from the first local oscillator signal, thus eliminating the need for a separate frequency synthesizer for the second down-conversion stage. A controller determines the frequency of the first local oscillator signal and a divisor M to align subcarrier grids for said first and second baseband signals with DC.

摘要翻译： 在双载波双转换正交频分复用（OFDM）接收机中，频率合成器为接收机的第一下行转换级产生第一本地振荡器信号。 分频器用于从第一本地振荡器信号导出第二本机振荡器信号，从而不需要用于第二下变频级的单独的频率合成器。 控制器确定第一本地振荡器信号的频率和除数M以使所述第一和第二基带信号的副载波网格与DC对准。

公开(公告)号：US08331506B2

公开(公告)日：2012-12-11

申请号：US12722666

申请日：2010-03-12

申请人： Chester Park ,  Leif Wilhelmsson ,  Lars Sundström

发明人： Chester Park ,  Leif Wilhelmsson ,  Lars Sundström

IPC分类号： H03D1/04

CPC分类号： H04L27/3863

摘要： RF impairment parameters, including frequency-dependent IQ imbalance, are estimated in a wideband received signal on a per-sub-band (or per sub-band pair) basis. In one embodiment, block-type pilot signals are received, such as on SCH, and IQ imbalance and carrier frequency offset are estimated from the block-type pilot signals. The block-type pilot signals may be received in only one sub-band. Data and comb-type pilot signals are then received on all sub-bands. Phase noise and channel coefficients are estimated for the first sub-band, based on the IQ imbalance and carrier frequency offset estimates. IQ imbalance is then successively estimated, on a per-sub-band (or per sub-band pair) basis, based on the comb-type pilot signals, the previously estimated carrier frequency offset estimate, and the phase noise and IQ imbalance estimates from prior sub-bands (or pairs). This may comprise iterative estimation based on decision feedback.

摘要翻译： 在每个子带（或每个子带对）的宽带接收信号中估计RF损伤参数，包括频率相关的IQ不平衡。 在一个实施例中，诸如在SCH上接收块型导频信号，并且从块型导频信号估计IQ不平衡和载波频率偏移。 块类型导频信号可以仅在一个子带中被接收。 然后在所有子带上接收数据和梳状导频信号。 基于IQ不平衡和载波频率偏移估计，针对第一子带估计相位噪声和信道系数。 然后，基于梳状导频信号，先前估计的载波频率偏移估计和相位噪声和IQ不平衡估计，基于每个子带（或每个子带对）来逐次地估计IQ不平衡。 先前的子带（或对）。 这可以包括基于判决反馈的迭代估计。

公开(公告)号：US20110222638A1

公开(公告)日：2011-09-15

申请号：US12722666

申请日：2010-03-12

申请人： Chester Park ,  Leif Wilhelmsson ,  Lars Sundström

发明人： Chester Park ,  Leif Wilhelmsson ,  Lars Sundström

IPC分类号： H04B1/10

CPC分类号： H04L27/3863

摘要： RF impairment parameters, including frequency-dependent IQ imbalance, are estimated in a wideband received signal on a per-sub-band (or per sub-band pair) basis. In one embodiment, block-type pilot signals are received, such as on SCH, and IQ imbalance and carrier frequency offset are estimated from the block-type pilot signals. The block-type pilot signals may be received in only one sub-band. Data and comb-type pilot signals are then received on all sub-bands. Phase noise and channel coefficients are estimated for the first sub-band, based on the IQ imbalance and carrier frequency offset estimates. IQ imbalance is then successively estimated, on a per-sub-band (or per sub-band pair) basis, based on the comb-type pilot signals, the previously estimated carrier frequency offset estimate, and the phase noise and IQ imbalance estimates from prior sub-bands (or pairs). This may comprise iterative estimation based on decision feedback.

摘要翻译： 在每个子带（或每个子带对）的宽带接收信号中估计RF损伤参数，包括频率相关的IQ不平衡。 在一个实施例中，诸如在SCH上接收块型导频信号，并且从块型导频信号估计IQ不平衡和载波频率偏移。 块类型导频信号可以仅在一个子带中被接收。 然后在所有子带上接收数据和梳状导频信号。 基于IQ不平衡和载波频率偏移估计，针对第一子带估计相位噪声和信道系数。 然后，基于梳状导频信号，先前估计的载波频率偏移估计和相位噪声和IQ不平衡估计，基于每个子带（或每个子带对）来逐次地估计IQ不平衡。 先前的子带（或对）。 这可以包括基于判决反馈的迭代估计。

公开(公告)号：US20130208776A1

公开(公告)日：2013-08-15

申请号：US13812619

申请日：2011-07-26

申请人： Jim Svensson ,  Chester Park ,  Lars Sundström ,  Leif Wilhelmsson

发明人： Jim Svensson ,  Chester Park ,  Lars Sundström ,  Leif Wilhelmsson

IPC分类号： H04B17/00

CPC分类号： H04B17/20 ,  H04B17/0085 ,  H04L27/2647 ,  H04L27/364 ,  H04L27/366

摘要： The invention proposes a way of inserting an analog test signal during normal reception into analog blocks of an OFDM receiver in such a way that the reception is either not corrupted at all, or only very little. This is achieved either by inserting the analog test signal in time or frequency where it does not corrupt the received signal, or by accounting for the interfering analog test signal in the decoding process.

摘要翻译： 本发明提出了一种在正常接收期间将模拟测试信号插入到OFDM接收机的模拟块中的方式，使得接收完全没有被破坏，或者只是很少。 这可以通过在不损坏接收信号的时间或频率插入模拟测试信号，或通过考虑解码过程中的干扰模拟测试信号来实现。

公开(公告)号：US09461730B2

公开(公告)日：2016-10-04

申请号：US13880529

申请日：2011-09-22

申请人： Leif Wilhelmsson ,  Lars Sundström

发明人： Leif Wilhelmsson ,  Lars Sundström

IPC分类号： H04B7/155 ,  H04B15/00

CPC分类号： H04B7/15585 ,  H04B7/155 ,  H04B15/00

摘要： A technique for controlling suppression of self-interference in a relay node configured to transmit and receive simultaneously using the same frequency channel or using proximate frequency channels is provided. A method implementation of this technique comprises the steps of actively cancelling a signal transmitted from the relay node that leaks back into a receiver of the relay node to suppress self-interference, determining whether an increase of an amount of self-interference suppression is needed or whether self-interference suppression can be decreased, and increasing or decreasing, depending on the result of the determination, at least one of the transmit power of the signal transmitted from the relay node and the receive power of the relay node.

摘要翻译： 提供了一种用于控制被配置为使用相同频率信道或使用接近频率信道同时发送和接收的中继节点中的自干扰抑制的技术。 该技术的方法实现包括以下步骤：主动地消除从中继节点发送的信号，该信号泄漏到中继节点的接收机中以抑制自干扰，确定是否需要增加自干扰抑制量， 取决于确定结果，能够减少自干扰抑制，以及根据确定结果增加或减少从中继节点发送的信号的发射功率和中继节点的接收功率中的至少一个。

公开(公告)号：US20130188756A1

公开(公告)日：2013-07-25

申请号：US13354984

申请日：2012-01-20

申请人： Lars Sundström ,  Magnus Nilsson ,  Leif Wilhelmsson

发明人： Lars Sundström ,  Magnus Nilsson ,  Leif Wilhelmsson

IPC分类号： H04L25/06 ,  H04L27/06

CPC分类号： H04L27/2649 ,  H04B1/0071 ,  H04B1/0075 ,  H04B1/28 ,  H04B1/403 ,  H04L5/001

摘要： In a dual-carrier, double-conversion Orthogonal Frequency Division Multiplexing (OFDM) receiver a frequency synthesizer generates a first local oscillator signal for the first down-conversions stage of the receiver. A frequency divider is used to derive a second local oscillator signal from the first local oscillator signal, thus eliminating the need for a separate frequency synthesizer for the second down-conversion stage. A controller determines the frequency of the first local oscillator signal and a divisor M to align subcarrier grids for said first and second baseband signals with DC.

摘要翻译： 在双载波双转换正交频分复用（OFDM）接收机中，频率合成器为接收机的第一下行转换级产生第一本地振荡器信号。 分频器用于从第一本地振荡器信号导出第二本机振荡器信号，从而不需要用于第二下变频级的单独的频率合成器。 控制器确定第一本地振荡器信号的频率和除数M以使所述第一和第二基带信号的副载波网格与DC对准。