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1.发明公开
公开(公告)号：EP0751625A2
公开(公告)日：1997-01-02
申请号：EP96304680.0
申请日：1996-06-25
发明人： Czaja, Stash , Niva, Ilkka , Robertson, Jim
IPC分类号： H03M13/00
CPC分类号： H03M13/4169 , H03M13/09 , H03M13/2933 , H03M13/4115
摘要： This invention teaches a method, and circuits that operate in accordance with the method, for decoding data received from a communications channel. The method includes the steps of: (a) receiving a modulated communications signal that conveys block encoded data having at least a data field and a syndrome data field; and (b) determining transition metrics and path metrics for the block encoded data. The step of determining path metrics includes a step of retaining path metrics only for a Maximum-Likelihood (ML) path and for a second best ML path. The method further includes a step of: (c) decoding the block encoded data by performing either a full or a partial traceback operation for both the ML path metrics and also for the second best ML path metrics. In a full traceback there is obtained from the ML path a first plurality of detected bits representing the data field, a second plurality of detected bits from the ML path representing the syndrome data field, a third plurality of detected bits from the second best ML path representing the data field, and a fourth plurality of detected bits from the second best ML path representing the syndrome data field. A next step (d) determines a syndrome from the first plurality of detected bits, and then compares the determined syndrome to the second plurality of detected bits. Upon a match a next step (e) outputs the first plurality of detected bits as a received frame of data. If the step of comparing the determined syndrome to the second plurality of detected bits does not indicate a match, the method instead: (f) determines a syndrome from the third plurality of detected bits; (g) compares the determined syndrome to the fourth plurality of detected bits and, upon a match, (h) outputs the third plurality of detected bits as a received frame of data.
摘要翻译： 本发明教导了一种方法和根据该方法操作的电路，用于解码从通信信道接收的数据。 该方法包括以下步骤：（a）接收传送具有至少一个数据字段和一个校正子数据字段的块编码数据的调制通信信号; 和（b）确定块编码数据的转移度量和路径度量。 确定路径度量的步骤包括仅针对最大似然（ML）路径和第二最佳ML路径保留路径量度的步骤。 该方法还包括以下步骤：（c）通过对ML路径量度以及对于第二最佳ML路径度量执行全部或部分回溯操作来对块编码数据进行解码。 在完整回溯中，从ML路径获得表示数据字段的第一多个检测到的比特，来自表示校正子数据字段的ML路径的第二多个检测到的比特，来自第二最佳ML路径的第三多个检测比特 表示数据字段，以及来自表示该校正子数据字段的第二最佳ML路径的第四多个检测到的比特。 下一步骤（d）从第一多个检测到的比特中确定校正子，然后将确定的校正子与第二多个检测到的比特进行比较。 在匹配时，下一步骤（e）将第一多个检测到的比特输出为接收的数据帧。 如果将确定的校正子与第二多个检测到的比特进行比较的步骤不指示匹配，则该方法改为：（f）从第三多个检测到的比特中确定校正子; （g）将确定的校正子与第四多个检测到的比特进行比较，并且在匹配时，（h）将第三多个检测到的比特作为接收的数据帧输出。
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公开(公告)号：EP0751625A3
公开(公告)日：2000-11-22
申请号：EP96304680.0
申请日：1996-06-25
发明人： Czaja, Stash , Niva, Ilkka , Robertson, Jim
CPC分类号： H03M13/4169 , H03M13/09 , H03M13/2933 , H03M13/4115
摘要： This invention teaches a method, and circuits that operate in accordance with the method, for decoding data received from a communications channel. The method includes the steps of: (a) receiving a modulated communications signal that conveys block encoded data having at least a data field and a syndrome data field; and (b) determining transition metrics and path metrics for the block encoded data. The step of determining path metrics includes a step of retaining path metrics only for a Maximum-Likelihood (ML) path and for a second best ML path. The method further includes a step of: (c) decoding the block encoded data by performing either a full or a partial traceback operation for both the ML path metrics and also for the second best ML path metrics. In a full traceback there is obtained from the ML path a first plurality of detected bits representing the data field, a second plurality of detected bits from the ML path representing the syndrome data field, a third plurality of detected bits from the second best ML path representing the data field, and a fourth plurality of detected bits from the second best ML path representing the syndrome data field. A next step (d) determines a syndrome from the first plurality of detected bits, and then compares the determined syndrome to the second plurality of detected bits. Upon a match a next step (e) outputs the first plurality of detected bits as a received frame of data. If the step of comparing the determined syndrome to the second plurality of detected bits does not indicate a match, the method instead: (f) determines a syndrome from the third plurality of detected bits; (g) compares the determined syndrome to the fourth plurality of detected bits and, upon a match, (h) outputs the third plurality of detected bits as a received frame of data.
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3.发明公开Device and method for detection and reduction of intermodulation distortion in a CDMA receiver 失效装置和方法，用于检测和减少在CDMA接收机中的互调失真
公开(公告)号：EP0862280A3
公开(公告)日：1999-12-29
申请号：EP98301465.5
申请日：1998-02-27
发明人： Kenney, Thomas J. , Niva, Ilkka , Gray, Steven D. , Dowling, Joe
CPC分类号： H04B1/7102 , H04B1/1027
摘要： In the front end of a CDMA cellular or broadband PCS mobile phone receiver, a switched bypass connection is provided to bypass the low noise amplifier, sending the received signal through an amplifier bypass connection. The amplifier bypass connection may include an attenuator. The switched bypass is activated by a control signal generated by a digital signal processor. The digital signal processor analyzes the received signal to detect and determine the relative contribution of the IMD interference to the total received signal power and, when the IMD interference exceeds a predetermined level, sends a control signal to bypass the low noise amplifier. Identification of the presence of IMD interference is by spectral estimation to discern when the mobile phone is in the presence of large near-band signals from an AMPS or other narrow-band base station which causes in- band IMD. In a preferred embodiment, the spectral estimation is performed by collecting a series of data samples from the received signal and, using a digital signal processor (DSP), computing a Discrete Fourier Transform (DFT) to generate frequency domain data, passing the data through a filter bank, then using a decision algorithm to determine whether or not there is sufficient IMD present in the received signal to bypass the LNA. If the IMD level is high enough to warrant bypass of the LNA, the DSP will provide a signal to an automatic gain control (AGC) block for controlling a variable gain amplifier (VGA) to compensate for gain loss due to bypass of the LNA.
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4.发明公开Method and apparatus for code tracking in a Rake receiver 审中-公开腓特烈兽王Verfahren undGerätzurKodenachführung
公开(公告)号：EP1176732A2
公开(公告)日：2002-01-30
申请号：EP01117093.3
申请日：2001-07-13
发明人： Niva, Ilkka , Jansen, Kaj , Ostman, Kjell
IPC分类号： H04B1/707
CPC分类号： H04B1/7117 , H04B1/7073 , H04B1/7085
摘要： The present invention provides a method and a device in which two or more fingers of a RAKE receiver can locked to a multipath received signal in a situation of fat finger impulse response. One embodiment of the present invention assigns two RAKE fingers to an impulse response so that one finger is tracking the impulse response with Early-Ontime DLL method and the other finger is tracking the impulse response with Ontime-Late DLL method. The method comprises detecting the delay between the received signal and its delayed version, comparing the delay with a pre-determined threshold and in the case when the delay falls below the threshold, changing the tracking method of the delayed version of the received signal to a second tracking method.
摘要翻译： 本发明提供一种方法和装置，其中RAKE接收机的两个或更多个手指可以在胖指脉冲响应的情况下锁定到多径接收信号。 本发明的一个实施例将两个RAKE手指分配给脉冲响应，使得一个手指利用Early-Ontime DLL方法跟踪脉冲响应，另一个手指利用Ontime-Late DLL方法跟踪脉冲响应。 该方法包括检测接收信号与其延迟版本之间的延迟，将延迟与预定阈值进行比较，并且在延迟低于阈值的情况下，将接收信号的延迟版本的跟踪方法改变为 第二跟踪方法。
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5.发明公开Device and method for detection and reduction of intermodulation distortion in a CDMA receiver 失效装置和方法，用于检测和减少在CDMA接收机中的互调失真
公开(公告)号：EP0862280A2
公开(公告)日：1998-09-02
申请号：EP98301465.5
申请日：1998-02-27
发明人： Kenney, Thomas J. , Niva, Ilkka , Gray, Steven D. , Dowling, Joe
CPC分类号： H04B1/7102 , H04B1/1027
摘要： In the front end of a CDMA cellular or broadband PCS mobile phone receiver, a switched bypass connection is provided to bypass the low noise amplifier, sending the received signal through an amplifier bypass connection. The amplifier bypass connection may include an attenuator. The switched bypass is activated by a control signal generated by a digital signal processor. The digital signal processor analyzes the received signal to detect and determine the relative contribution of the IMD interference to the total received signal power and, when the IMD interference exceeds a predetermined level, sends a control signal to bypass the low noise amplifier. Identification of the presence of IMD interference is by spectral estimation to discern when the mobile phone is in the presence of large near-band signals from an AMPS or other narrow-band base station which causes in- band IMD. In a preferred embodiment, the spectral estimation is performed by collecting a series of data samples from the received signal and, using a digital signal processor (DSP), computing a Discrete Fourier Transform (DFT) to generate frequency domain data, passing the data through a filter bank, then using a decision algorithm to determine whether or not there is sufficient IMD present in the received signal to bypass the LNA. If the IMD level is high enough to warrant bypass of the LNA, the DSP will provide a signal to an automatic gain control (AGC) block for controlling a variable gain amplifier (VGA) to compensate for gain loss due to bypass of the LNA.
摘要翻译： 在CDMA蜂窝式或PCS宽带移动电话接收器的前端，开关旁路连接被提供给旁路低噪声放大器，通过发送所接收的信号到放大器旁路连接。 放大器旁路连接可包括衰减器。 切换旁路被由数字信号处理器产生的控制信号激活。 数字信号处理器分析所接收的信号，以检测和确定矿IMD干扰对总的接收信号功率，并且当IMD干扰超过预定电平时，发送控制信号以绕过所述低噪声放大器的相对贡献。 IMD干扰的存在的鉴定是通过光谱估计辨别当移动电话处于大近带信号的从在AMPS或其他窄带基站引起带内IMD的存在。 在优选的实施方式的谱估计执行通过通过从所接收的信号采集的一系列数据样本，并使用数字信号处理器（DSP），计算离散傅立叶变换（DFT），以产生频域数据，并传递数据 一个滤波器组，然后使用决策算法确定性矿是否有足够的IMD存在于所接收的信号绕过LNA。 如果IMD电平高到足以保证LNA的旁路，则DSP将提供一个信号，以在自动增益控制（AGC）块，用于控制可变增益放大器（VGA）以便用于增益损失补偿由于LNA的旁路。
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