公开(公告)号：EP2253095B1

公开(公告)日：2016-12-21

申请号：EP09716037.8

申请日：2009-02-20

Applicant: QUALCOMM Incorporated

Inventor： ABRISHAMKAR, Farrokh ,  SIKRI, Divaydeep

IPC: H04L7/04 ,  H04L25/02

CPC classification number: H04L7/042 ,  H04L7/048 ,  H04L25/0228

公开(公告)号：EP1629648A1

公开(公告)日：2006-03-01

申请号：EP04776207.5

申请日：2004-05-28

Applicant: QUALCOMM INCORPORATED

Inventor： ABRISHAMKAR, Farrokh ,  BANISTER, Brian ,  SIH, Gilbert, C. ,  EKVETCHAVIT, Thunyachate

IPC: H04L25/02 ,  H04B7/005

CPC classification number: H04B1/1027 ,  H04B17/336 ,  H04W52/143 ,  H04W52/241 ,  H04W52/248

Abstract: This disclosure is directed to techniques for estimating signal-to-noise ratio (SNR) of signals received by a wireless communication device. The techniques take advantage of spatial receive diversity in a wireless communication device to achieve accurate estimates of SNR. In general, a spatial projection wiener filter function can be applied to incoming symbol estimates to support efficient computation of SNR. The estimated SNR can be used to produce power control commands for use in forward power control.

公开(公告)号：EP2135415B1

公开(公告)日：2019-12-11

申请号：EP08780512.3

申请日：2008-04-09

Applicant: QUALCOMM Incorporated

Inventor： ABRISHAMKAR, Farrokh ,  MOTAMED, Mariam ,  SUBRAHMANYA, Parvathanathan

IPC: H04L25/02

公开(公告)号：EP2089983B1

公开(公告)日：2018-02-21

申请号：EP07845091.3

申请日：2007-11-15

Applicant: QUALCOMM Incorporated

Inventor： SHIM, Byonghyo ,  ABRISHAMKAR, Farrokh ,  KANG, Inyup

IPC: H04B1/7107 ,  H04B1/7105 ,  H04B1/7115

CPC classification number: H04B1/71072 ,  H04B1/71055 ,  H04B1/71075 ,  H04B1/7115 ,  H04B2201/70702

Abstract: Techniques for recovering a desired transmission in the presence of interfering transmissions are described. For iterative detection and cancellation, multiple groups of code channels are formed for a plurality of code channels for at least one sector. Processing is performed for the multiple groups of code channels in multiple iterations. For each iteration, data detection and signal cancellation are performed for the multiple groups of code channels in multiple stages, e.g., in a sequential order starting with the strongest group to the weakest group. Each stage of each iteration may perform data detection, signal reconstruction, and signal cancellation. Each stage of each iteration may also perform equalization, data detection, signal reconstruction, and signal cancellation.

公开(公告)号：EP2324608A1

公开(公告)日：2011-05-25

申请号：EP09791549.0

申请日：2009-08-15

Applicant: QUALCOMM Incorporated

Inventor： SIKRI, Divaydeep ,  ABRISHAMKAR, Farrokh ,  MCCLOUD, Michael L.

IPC: H04L25/03 ,  H04L7/04

CPC classification number: H04W56/00

Abstract: A method for suppressing interference in a wireless communication is provided. The method comprises receiving a burst of symbols, generating a plurality of timing hypotheses for the burst of symbols, and calculating, for each timing hypothesis, a plurality of weights for an interference suppression filter based upon a subset of the burst of symbols. The method further comprises, for each timing hypothesis, filtering the subset of the burst of symbols using the interference suppression filter with the corresponding plurality of weights, and selecting one of the plurality of timing hypotheses corresponding to a selection criteria. The method further comprises equalizing and decoding the filtered burst of symbols based upon the selected one of the plurality of timing hypotheses.

公开(公告)号：EP2253095A2

公开(公告)日：2010-11-24

申请号：EP09716037.8

申请日：2009-02-20

Applicant: QUALCOMM Incorporated

Inventor： ABRISHAMKAR, Farrokh ,  SIKRI, Divaydeep

IPC: H04L7/04 ,  H04L25/02

CPC classification number: H04L7/042 ,  H04L7/048 ,  H04L25/0228

Abstract: A method for midamble estimation comprises the steps of receiving a burst of symbols, selecting a subset of the burst of symbols that comprises a first midamble symbol, calculating, for each symbol in the subset, a corresponding midamble estimation error, and determining the lowest calculated midamble estimation error to locate the first midamble symbol. A receiver comprises an antenna configured to receive a burst of symbols, a timing estimator configured to select a subset of the burst of symbols that comprises a first midamble symbol, a midamble estimator configured to calculate, for each symbol in the subset, a corresponding midamble estimation error, and a processor configured to select the symbol in the subset corresponding to a lowest calculated midamble estimation error as the first midamble symbol.

公开(公告)号：EP1632072A1

公开(公告)日：2006-03-08

申请号：EP04776206.7

申请日：2004-05-28

Applicant: QUALCOMM INCORPORATED

Inventor： ABRISHAMKAR, Farrokh ,  SMEE, John, E. ,  GLAZKO, Serguei

IPC: H04L25/03 ,  H04L23/02

CPC classification number: H04L23/02 ,  H04L25/03057 ,  H04L2025/03375 ,  H04L2025/0349 ,  H04L2025/03611

Abstract: A decision feedback equalizer includes a chip estimate buffer that forms chip estimates into a vector. A CCK decoder decodes the vector of chip estimates, and a CCK encoder, connected with the CCK decoder, re-encodes the vector of chip estimates into a valid CCK code word. At the same time, a chip slicer provides direct sliced chips from the chip estimates. An update module then forms a hybrid vector from the valid CCK code-word and the direct sliced chips for input to the feedback filter of the decision feedback equalizer. The hybrid feedback filter input vector reflects the CCK coding gain of its re-encoded portion thereby reducing the estimated chip error rate to improve the performance of the decision feedback equalizer.

公开(公告)号：EP2438725B1

公开(公告)日：2017-11-15

申请号：EP10723892.5

申请日：2010-06-04

Applicant: QUALCOMM Incorporated

Inventor： SIKRI, Divaydeep ,  ABRISHAMKAR, Farrokh

IPC: H04L25/02 ,  H04L25/03

CPC classification number: H04L25/03019 ,  H04L25/0228

公开(公告)号：EP2474138A2

公开(公告)日：2012-07-11

申请号：EP10757659.7

申请日：2010-09-03

Applicant: QUALCOMM Incorporated

Inventor： CANPOLAT, Bahadir ,  ABRISHAMKAR, Farrokh ,  SIKRI, Divaydeep

IPC: H04L25/03

CPC classification number: H04L25/03178 ,  H04L25/0328

Abstract: A novel symbol estimation method produces intersymbol interference free symbols by detecting interfering symbols in an interfering channel. A channel estimate is refined for additional improvements. The method can lends itself as a serial or parallel algorithm implementation. The symbol estimation method includes using an initial estimate of received symbols and calculating a refined estimate of the received symbols using a channel estimate. The refined estimate is calculated by performing parameterization of intersymbol interference by symbols other than the symbol being refined and selecting a refined value for the symbol being refined by evaluating an optimization function. Symbol estimates are refined in multiple iterations, until a predetermined iteration termination criterion is met. Parameterization of ISI contribution of other symbols results in reduced computation by reducing total number of unknown variables in the refinement operation.

公开(公告)号：EP2438725A2

公开(公告)日：2012-04-11

申请号：EP10723892.5

申请日：2010-06-04

Applicant: QUALCOMM Incorporated

Inventor： SIKRI, Divaydeep ,  ABRISHAMKAR, Farrokh

IPC: H04L25/03

CPC classification number: H04L25/03019 ,  H04L25/0228

Abstract: A method for suppressing interference in a wireless communication comprises receiving a burst of symbols, filtering the burst of symbols using an interference suppression filter with a first plurality of weights, decoding the filtered burst of symbols to generate data corresponding to the burst of symbols, encoding the data to generate a re-encoded burst of symbols, calculating a second plurality of weights for the interference suppression filter based upon the re-encoded burst of symbols, filtering the re-encoded burst of symbols using the interference suppression filter with the second plurality of weights, and decoding the filtered re-encoded burst of symbols.

Abstract translation: 一种用于抑制无线通信中的干扰的方法包括：接收符号脉冲串，使用具有第一多个权重的干扰抑制滤波器对符号突发进行滤波，对经过滤波的符号突发进行解码以产生与符号突发相对应的数据，编码 所述数据用于生成重新编码的码元突发，基于重新编码的符号突发计算干扰抑制滤波器的第二多个权重，使用具有第二多个干扰抑制滤波器对重新编码的码元突发进行滤波 并对经滤波的重新编码的符号突发进行解码。