公开(公告)号：US08428519B2

公开(公告)日：2013-04-23

申请号：US13165059

申请日：2011-06-21

申请人： Alphan Sahin ,  Ismail Guvenc ,  Huseyin Arslan

发明人： Alphan Sahin ,  Ismail Guvenc ,  Huseyin Arslan

IPC分类号： H04B1/00

CPC分类号： H04W16/16 ,  H04W84/045

摘要： In one embodiment, a method of mitigating uplink inter-carrier interference (ICI) from macrocell mobile stations at a dedicated channel femtocell base station is provided that includes: determining a timing offset for a femtocell uplink symbol timing that reduces the ICI based upon an expected spatial distribution for the macrocell mobile stations with respect to the femtocell base station; communicating the timing offset to at least one femtocell mobile station; and at the femtocell base station, receiving an uplink symbol transmission from the at least one femtocell mobile station according to the timing offset.

摘要翻译： 在一个实施例中，提供了一种在专用信道毫微微小区基站处减轻来自宏小区移动站的上行链路载波间干扰（ICI）的方法，其包括：基于预期的方式来确定用于减少ICI的毫微微小区上行链路符号定时的定时偏移 相对于毫微微小区基站的宏小区移动站的空间分布; 将定时偏移传送到至少一个毫微微蜂窝移动站; 并且在所述毫微微小区基站处，根据所述定时偏移从所述至少一个毫微微小区移动站接收上行链路符号传输。

公开(公告)号：US08891430B1

公开(公告)日：2014-11-18

申请号：US14047150

申请日：2013-10-07

申请人： Alphan Sahin ,  Huseyin Arslan

发明人： Alphan Sahin ,  Huseyin Arslan

IPC分类号： H04W4/00 ,  H04L25/03 ,  H04L5/00 ,  H04L27/26

CPC分类号： H04L25/03828 ,  H04L5/0007 ,  H04L25/0384 ,  H04L27/00 ,  H04L27/2634 ,  H04L27/2647

摘要： Various methods and systems are provided for edge windowing of orthogonal frequency division multiplexing (OFDM) systems. In one example, among others, a method includes obtaining an edge windowing portion by reducing a cyclic prefix size for a quantity of edge subcarriers in an OFDM symbol and reducing side lobes by applying a windowing function to the edge subcarriers. In another example, a device includes a separator capable of dividing subcarriers of an OFDM symbol into first and second subcarrier groups, a first CP adder capable of obtaining a windowing portion by adjusting a cyclic prefix size of the first subcarrier group, and a first windower capable of reducing side lobes by applying a windowing function to the first subcarrier group. In another example, a method includes determining a RMS delay spread of a mobile station and scheduling a subcarrier based at least in part upon the RMS delay spread.

摘要翻译： 提供了用于正交频分复用（OFDM）系统的边缘加窗的各种方法和系统。 在一个示例中，其中一个方法包括通过减少OFDM符号中的边缘子载波量的循环前缀大小来获得边缘加窗部分，并且通过对边缘子载波应用加窗函数来减少旁瓣。 在另一示例中，设备包括能够将OFDM符号的子载波划分为第一和第二子载波组的分离器，能够通过调整第一子载波组的循环前缀大小而获得加窗部分的第一CP加法器，以及第一加法器 能够通过对第一子载波组施加加窗函数来减少旁瓣。 在另一示例中，一种方法包括确定移动台的RMS延迟扩展，并且至少部分地基于RMS延迟扩展来调度子载波。

公开(公告)号：US20110312317A1

公开(公告)日：2011-12-22

申请号：US13165059

申请日：2011-06-21

申请人： Alphan Sahin ,  Ismail Guvenc ,  Huseyin Arslan

发明人： Alphan Sahin ,  Ismail Guvenc ,  Huseyin Arslan

IPC分类号： H04W4/00

CPC分类号： H04W16/16 ,  H04W84/045

摘要： In one embodiment, a method of mitigating uplink inter-carrier interference (ICI) from macrocell mobile stations at a dedicated channel femtocell base station is provided that includes: determining a timing offset for a femtocell uplink symbol timing that reduces the ICI based upon an expected spatial distribution for the macrocell mobile stations with respect to the femtocell base station; communicating the timing offset to at least one femtocell mobile station; and at the femtocell base station, receiving an uplink symbol transmission from the at least one femtocell mobile station according to the timing offset.

摘要翻译： 在一个实施例中，提供了一种在专用信道毫微微小区基站处减轻来自宏小区移动站的上行链路载波间干扰（ICI）的方法，其包括：基于预期的方式来确定用于减少ICI的毫微微小区上行链路符号定时的定时偏移 相对于毫微微小区基站的宏小区移动站的空间分布; 将定时偏移传送到至少一个毫微微蜂窝移动站; 并且在所述毫微微小区基站处，根据所述定时偏移从所述至少一个毫微微小区移动站接收上行链路符号传输。

公开(公告)号：US09780985B1

公开(公告)日：2017-10-03

申请号：US15151998

申请日：2016-05-11

申请人： Anas Tom ,  Alphan Sahin ,  Huseyin Arslan

发明人： Anas Tom ,  Alphan Sahin ,  Huseyin Arslan

IPC分类号： H04K1/10 ,  H04L27/26 ,  H04L5/00 ,  H04B15/00 ,  H04B17/336

CPC分类号： H04L27/2614 ,  H04B15/00 ,  H04B17/26 ,  H04B17/309 ,  H04B17/336 ,  H04B17/345 ,  H04B17/354 ,  H04B17/364 ,  H04B17/3912 ,  H04L5/0007

摘要： Various examples are provided for OOB interference and/or PAPR reduction in OFDM systems. In one example, a method includes generating a suppressing signal using channel state information (CSI) of a communication channel, where the length of the suppressing signal equals that of the OFDM symbol including a cyclic prefix (CP) and data portion; combining the OFDM symbol and the suppressing signal to generate a transmission signal, where the length of the suppressing signal is aligned with the length of the OFDM symbol; and communicating the transmission signal via the communication channel, which reduces and substantially aligns the length of the suppressing signal with a length of the CP at a receiving device. The CP and suppressing signal can be removed from the transmitted signal at the receiver using a CP removal matrix. In another example, a transmitting device includes OFDM encoding, signal suppression, combining circuitry to generate the transmission signal.

公开(公告)号：US09319253B2

公开(公告)日：2016-04-19

申请号：US13680306

申请日：2012-11-19

申请人： Alphan Sahin ,  Huseyin Arslan

发明人： Alphan Sahin ,  Huseyin Arslan

IPC分类号： H04L25/03 ,  H04L27/00 ,  H04L27/26 ,  H04L5/00

CPC分类号： H04L25/03828 ,  H04L5/0007 ,  H04L25/0384 ,  H04L27/00 ,  H04L27/2634 ,  H04L27/2647

摘要： Various methods and systems are provided for edge windowing of orthogonal frequency division multiplexing (OFDM) systems. In one example, among others, a method includes obtaining an edge windowing portion by reducing a cyclic prefix size for a quantity of edge subcarriers in an OFDM symbol and reducing side lobes by applying a windowing function to the edge subcarriers. In another example, a device includes a separator capable of dividing subcarriers of an OFDM symbol into first and second subcarrier groups, a first CP adder capable of obtaining a windowing portion by adjusting a cyclic prefix size of the first subcarrier group, and a first windower capable of reducing side lobes by applying a windowing function to the first subcarrier group. In another example, a method includes determining a RMS delay spread of a mobile station and scheduling a subcarrier based at least in part upon the RMS delay spread.

摘要翻译： 提供了用于正交频分复用（OFDM）系统的边缘加窗的各种方法和系统。 在一个示例中，其中一个方法包括通过减少OFDM符号中的边缘子载波量的循环前缀大小来获得边缘加窗部分，并且通过对边缘子载波应用加窗函数来减少旁瓣。 在另一示例中，设备包括能够将OFDM符号的子载波划分为第一和第二子载波组的分离器，能够通过调整第一子载波组的循环前缀大小而获得加窗部分的第一CP加法器，以及第一加法器 能够通过对第一子载波组施加加窗函数来减少旁瓣。 在另一示例中，一种方法包括确定移动台的RMS延迟扩展，并且至少部分地基于RMS延迟扩展来调度子载波。

公开(公告)号：US09065710B1

公开(公告)日：2015-06-23

申请号：US14069652

申请日：2013-11-01

申请人： Ertugrul Guvenkaya ,  Alphan Sahin ,  Huseyin Arslan

发明人： Ertugrul Guvenkaya ,  Alphan Sahin ,  Huseyin Arslan

IPC分类号： H04L27/26 ,  H04B1/10

CPC分类号： H04B1/1027 ,  H04L5/0048

摘要： Disclosed are various embodiments that are directed towards distinguishing between various types of interference in an orthogonal frequency division multiplexing (OFDM) wireless communication system. According to some embodiments, the system receives a set of symbols encoded in a predetermined subcarrier activation pattern according to an OFDM protocol. The system may determine a plurality of time averaged interference values, each time averaged interference value corresponding to a respective subcarrier index expressed in the set of symbols. Then, the system may separate frequency-based interference from time-based interference according to the plurality of time averaged interference values.

摘要翻译： 公开了旨在区分正交频分复用（OFDM）无线通信系统中的各种类型的干扰的各种实施例。 根据一些实施例，系统根据OFDM协议接收以预定子载波激活模式编码的一组符号。 系统可以确定多个时间平均干扰值，每次平均干扰值对应于在该组符号中表示的相应子载波索引。 然后，系统可以根据多个时间平均干扰值将基于频率的干扰与基于时间的干扰分离。

公开(公告)号：US20130129017A1

公开(公告)日：2013-05-23

申请号：US13680306

申请日：2012-11-19

申请人： Alphan Sahin ,  Huseyin Arslan

发明人： Alphan Sahin ,  Huseyin Arslan

IPC分类号： H04L27/00

CPC分类号： H04L25/03828 ,  H04L5/0007 ,  H04L25/0384 ,  H04L27/00 ,  H04L27/2634 ,  H04L27/2647

摘要： Various methods and systems are provided for edge windowing of orthogonal frequency division multiplexing (OFDM) systems. In one example, among others, a method includes obtaining an edge windowing portion by reducing a cyclic prefix size for a quantity of edge subcarriers in an OFDM symbol and reducing side lobes by applying a windowing function to the edge subcarriers. In another example, a device includes a separator capable of dividing subcarriers of an OFDM symbol into first and second subcarrier groups, a first CP adder capable of obtaining a windowing portion by adjusting a cyclic prefix size of the first subcarrier group, and a first windower capable of reducing side lobes by applying a windowing function to the first subcarrier group. In another example, a method includes determining a RMS delay spread of a mobile station and scheduling a subcarrier based at least in part upon the RMS delay spread.

摘要翻译： 提供了用于正交频分复用（OFDM）系统的边缘加窗的各种方法和系统。 在一个示例中，其中一个方法包括通过减少OFDM符号中的边缘子载波量的循环前缀大小来获得边缘加窗部分，并且通过对边缘子载波应用加窗函数来减少旁瓣。 在另一示例中，设备包括能够将OFDM符号的子载波划分为第一和第二子载波组的分离器，能够通过调整第一子载波组的循环前缀大小而获得加窗部分的第一CP加法器，以及第一加法器 能够通过对第一子载波组施加加窗函数来减少旁瓣。 在另一示例中，一种方法包括确定移动台的RMS延迟扩展，并且至少部分地基于RMS延迟扩展来调度子载波。