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

申请人： NOKIA MOBILE PHONES LTD.

发明人： Kenney, Thomas J. ,  Niva, Ilkka ,  Gray, Steven D. ,  Dowling, Joe

IPC分类号： H04B1/707 ,  H04B1/10

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.

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

申请人： NOKIA MOBILE PHONES LTD.

发明人： Kenney, Thomas J. ,  Niva, Ilkka ,  Gray, Steven D. ,  Dowling, Joe

IPC分类号： H04B1/707 ,  H04B1/10

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。

公开(公告)号：EP0926915A3

公开(公告)日：2000-04-05

申请号：EP98310576.8

申请日：1998-12-22

申请人： NOKIA MOBILE PHONES LTD.

发明人： Mekkoth, Ajith ,  Yeoman, Darin ,  Gould, Adam ,  Dowling, Joe

IPC分类号： H04Q7/38 ,  H04B7/26

CPC分类号： H04W48/16

摘要： This invention teaches methods, and circuits that operate in accordance with the methods, for improving the management and control of pilot channel sets for a CDMA mobile station. In one aspect a Priority Neighbor Search technique is provided, wherein a list of Priority Neighbor pilot channels is maintained and searched with a higher priority than the Neighbor Set pilot channels. In a further aspect this invention provides a Dropped Pilot Channel Search technique wherein a set is made of the last pilot channel or pilot channels dropped from the Active Set, wherein the dropped pilot channels are searched for some period of time with a higher priority than the Neighbor Set pilot channels. This invention also provides a High Priority Search Set feature which includes members of the Active Set, the Candidate Set, the Dropped Pilot Set, and the Priority Neighbor Set.

公开(公告)号：EP0926915A2

公开(公告)日：1999-06-30

申请号：EP98310576.8

申请日：1998-12-22

申请人： NOKIA MOBILE PHONES LTD.

发明人： Mekkoth, Ajith ,  Yeoman, Darin ,  Gould, Adam ,  Dowling, Joe

IPC分类号： H04Q7/38 ,  H04B7/26

CPC分类号： H04W48/16

摘要： This invention teaches methods, and circuits that operate in accordance with the methods, for improving the management and control of pilot channel sets for a CDMA mobile station. In one aspect a Priority Neighbor Search technique is provided, wherein a list of Priority Neighbor pilot channels is maintained and searched with a higher priority than the Neighbor Set pilot channels. In a further aspect this invention provides a Dropped Pilot Channel Search technique wherein a set is made of the last pilot channel or pilot channels dropped from the Active Set, wherein the dropped pilot channels are searched for some period of time with a higher priority than the Neighbor Set pilot channels. This invention also provides a High Priority Search Set feature which includes members of the Active Set, the Candidate Set, the Dropped Pilot Set, and the Priority Neighbor Set.

摘要翻译： 本发明教导了根据该方法进行操作的方法和电路，用于改进用于CDMA移动台的导频信道集合的管理和控制。 在一个方面，提供了一种优先级邻域搜索技术，其中以比相邻集导频信道更高的优先级来维护和搜索优先级邻居导频信道的列表。 在另一方面，本发明提供了一种丢弃的导频信道搜索技术，其中一组由从活动集中丢弃的最后导频信道或导频信道组成，其中，丢弃的导频信道被搜索一段时间，优先级高于 邻居设置导频信道。 本发明还提供了一种高优先级搜索集特征，其包括活动集，候选集，丢弃的导频集和优先相邻集的成员。