公开(公告)号：US20080253487A1

公开(公告)日：2008-10-16

申请号：US11733646

申请日：2007-04-10

申请人： Farrokh Abrishamkar ,  Mariam Motamed ,  Parvathanathan Subrahmanya

发明人： Farrokh Abrishamkar ,  Mariam Motamed ,  Parvathanathan Subrahmanya

IPC分类号： H04L1/20

CPC分类号： H04L25/0228

摘要： Techniques for performing adaptive channel estimation are described. A receiver derives channel estimates for a wireless channel based on received pilot symbols and at least one estimation parameter. The receiver updates the at least one estimation parameter based on the received pilot symbols. The at least one estimation parameter may be for an innovations representation model of the wireless channel and may be updated based on a cost function with costs defined by prediction errors. In one design, the receiver derives predicted pilot symbols based on the received pilot symbols and the at least one estimation parameter, determines prediction errors based on the received pilot symbols and the predicted pilot symbols, and further derives error gradients based on the prediction errors. The receiver then updates the at least one estimation parameter based on the error gradients and the prediction errors, e.g., if a stability test is satisfied.

摘要翻译： 描述用于执行自适应信道估计的技术。 接收机基于接收的导频符号和至少一个估计参数导出无线信道的信道估计。 接收机基于接收的导频符号来更新至少一个估计参数。 所述至少一个估计参数可以是针对无线信道的创新表示模型，并且可以基于具有由预测误差定义的成本的成本函数来更新。 在一种设计中，接收器基于接收到的导频符号和至少一个估计参数导出预测的导频符号，基于接收到的导频符号和预测的导频符号来确定预测误差，并且还基于预测误差导出误差梯度。 然后，接收器基于误差梯度和预测误差来更新至少一个估计参数，例如，如果满足稳定性测试。

公开(公告)号：US20080112382A1

公开(公告)日：2008-05-15

申请号：US11560206

申请日：2006-11-15

申请人： Byonghyo Shim ,  Inyup Kang ,  Farrokh Abrishamkar ,  Sharad Sambhwani

发明人： Byonghyo Shim ,  Inyup Kang ,  Farrokh Abrishamkar ,  Sharad Sambhwani

IPC分类号： H04B7/216

CPC分类号： H04L25/03006 ,  H04B1/71072 ,  H04L2025/03617

摘要： Techniques for recovering a desired transmission in the presence of interfering transmissions are described. For successive equalization and cancellation (SEC), equalization is performed on a received signal to obtain an equalized signal for a first set of code channels. The first set may include all code channels for one sector, a subset of all code channels for one sector, multiple code channels for multiple sectors, etc. Data detection is then performed on the equalized signal to obtain a detected signal for the first set of code channels. A signal for the first set of code channels is reconstructed based on the detected signal. The reconstructed signal for the first set of code channels is then canceled from the received signal. Equalization, data detection, reconstruction, and cancellation are performed for at least one additional set of code channels in similar manner.

摘要翻译： 描述了在存在干扰传输的情况下恢复所需传输的技术。 对于连续均衡和消除（SEC），对接收到的信号执行均衡以获得第一组码信道的均衡信号。 第一组可以包括一个扇区的所有码信道，一个扇区的所有码信道的子集，多个扇区的多个码信道等。然后，对均衡信号执行数据检测，以获得第一组的第一组的检测信号 代码渠道 基于检测到的信号重建用于第一组码信道的信号。 然后，从接收到的信号中取消用于第一组码信道的重建信号。 对于至少一个附加的代码信道集合以类似的方式执行均衡，数据检测，重建和消除。

公开(公告)号：US06829485B2

公开(公告)日：2004-12-07

申请号：US09955521

申请日：2001-09-12

申请人： Farrokh Abrishamkar ,  Mark Roh

发明人： Farrokh Abrishamkar ,  Mark Roh

IPC分类号： H04Q720

CPC分类号： H04W68/00 ,  H04B1/7075 ,  H04B1/7115 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04W52/028 ,  H04W68/025 ,  Y02D70/40

摘要： A system determines if a primary paging channel should be received based on an examination of a quick paging channel. A first QPCH symbol is examined (102) and the normalized pilot energy is determined (104). If the normalized pilot energy is above a first threshold (106), the symbol is demodulated and the QPCH-symbol-to-pilot-energy ratio is determined (110) and compared against another threshold (112). If the normalized pilot energy is below the first threshold, the system proceeds to the second QPCH symbol immediately. Depending on the resulting values, a second QPCH signal is examined (108), the system sleeps (114), or the system decides (116) to process the primary paging channel directly (118). If the second signal is demodulated, and if its normalized pilot energy is high enough, it also is demodulated and the ratio of the sum-of-the-combined-QPCH-symbols to the sum-of-the-combined-pilot-energies is determined (122). If this ratio exceeds a threshold (124), the primary paging channel is processed (118); otherwise the system sleeps (114).

摘要翻译： 系统基于快速寻呼信道的检查来确定是否应该接收主寻呼信道。 检查第一QPCH符号（102）并且确定归一化导频能量（104）。 如果归一化的导频能量高于第一阈值（106），则对该符号进行解调并且确定QPCH符号到导频能量比（110）并与另一阈值（112）进行比较。 如果归一化的导频能量低于第一阈值，则系统立即进入第二QPCH符号。 根据得到的值，检查第二QPCH信号（108），系统休眠（114），或者系统决定（116）直接处理主寻呼信道（118）。 如果第二信号被解调，并且如果其归一化导频能量足够高，则其也被解调，并且组合QPCH符号之和与组合导频能量之和的比率 确定（122）。 如果该比率超过阈值（124），则处理主寻呼信道（118）; 否则系统睡眠（114）。

公开(公告)号：US06771616B2

公开(公告)日：2004-08-03

申请号：US09952722

申请日：2001-09-13

申请人： Farrokh Abrishamkar ,  Mark Roh

发明人： Farrokh Abrishamkar ,  Mark Roh

IPC分类号： H04Q100

CPC分类号： H04W68/00 ,  H04B1/7075 ,  H04B1/7115 ,  H04B2201/70701 ,  H04W52/0216 ,  H04W52/0219 ,  H04W52/0245 ,  Y02D70/40

摘要： A system determines if a primary paging channel should be received based on an examination of a quick paging channel. A first QPCH symbol is examined (102) and the normalized pilot energy is determined (104). If the normalized pilot energy is above a first threshold (106), the symbol is demodulated and the QPCH-symbol-to-pilot-energy ratio is determined (110) and compared against another threshold (114). If the normalized pilot energy is below the first threshold, the system proceeds to the second QPCH symbol immediately. Based on the two comparisons, a second QPCH signal is examined (108) or the system sleeps (116). If the second signal is examined, and if its normalized pilot energy is high enough, it also is demodulated and the ratio of the sum-of-the-combined-QPCH-symbols to the sum-of-the-combined-pilot-energies is determined (122). If this ratio exceeds a threshold (124), the primary paging channel is processed (120); otherwise the system sleeps (116).

摘要翻译： 系统基于快速寻呼信道的检查来确定是否应该接收主寻呼信道。 检查第一QPCH符号（102）并且确定归一化导频能量（104）。 如果归一化的导频能量高于第一阈值（106），则对该符号进行解调，并且确定QPCH符号到导频能量比（110）并与另一个阈值进行比较（114）。 如果归一化的导频能量低于第一阈值，则系统立即进入第二QPCH符号。 基于两个比较，检查第二QPCH信号（108）或系统睡眠（116）。 如果检测到第二信号，并且如果其归一化导频能量足够高，则其也被解调，并且组合QPCH符号之和与组合导频能量之和的比率 确定（122）。 如果该比率超过阈值（124），则处理主寻呼信道（120）; 否则系统睡眠（116）。

公开(公告)号：US6134278A

公开(公告)日：2000-10-17

申请号：US16675

申请日：1998-01-30

申请人： Farrokh Abrishamkar ,  Jaehyeong Kim ,  Zulfiquar Sayeed

发明人： Farrokh Abrishamkar ,  Jaehyeong Kim ,  Zulfiquar Sayeed

IPC分类号： H04B1/707 ,  H04L1/00 ,  H04L1/08 ,  H03D1/00 ,  H04B3/46 ,  H04B17/00 ,  H04L27/06 ,  H04Q1/20

CPC分类号： H04L1/208 ,  H04B1/707 ,  H04L1/0046 ,  H04L1/0054 ,  H04L1/08 ,  H04B2201/70705 ,  H04L1/0071

摘要： Techniques for more accurately detecting the data rate of a frame of data in a cellular telephone system are described. Data is preferably received at one of four rates: full, half, quarter and eighth. A correlation is performed between the incoming soft data and the data generated by re-encoding and re-repeating the data. Variations on the approach make it readily possible to accurately perform rateset 1 or rateset 2 rate detection.

摘要翻译： 描述了用于更准确地检测蜂窝电话系统中的数据帧的数据速率的技术。 数据优选地以四种速率之一接收：全，半，四分之一和八分之一。 在进入的软数据和通过重新编码产生的数据和重复数据之间执行相关性。 方法的变化使得可以准确地执行速率1或速率2速率检测。