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公开(公告)号：NO20042344L
公开(公告)日：2004-07-28
申请号：NO20042344
申请日：2004-06-07
Applicant: QUALCOMM INC
Inventor： SMEE JOHN E , JAYARAMAN SRIKANT , FERNANDEZ-CORBATON IVAN JESUS
Abstract: A carrier recovery method and apparatus using multiple stages of carrier frequency recovery are disclosed. A receiver uses multiple frequency generation sources to generate carrier signals used to downconvert a received signal. An analog frequency reference having a wide frequency range and coarse frequency resolution is used in conjunction with a digital frequency reference having a narrow frequency range and fine frequency resolution. The multiple carrier signals are multiplied by a received signal to effect a multi-stage downconversion, resulting in a baseband signal. A frequency tracking module measures the residual frequency error present in the baseband signal. The measured residual frequency error is then used to adjust the frequencies of the carrier signals generated by the multiple frequency generation sources.
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公开(公告)号：NO20042343A
公开(公告)日：2004-07-23
申请号：NO20042343
申请日：2004-06-07
Applicant: QUALCOMM INC
Inventor： SMEE JOHN E , JAYARAMAN SRIKANT , FERNANDEZ-CORBATON IVAN JESUS
CPC classification number: H04B1/1036
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公开(公告)号：CA2495986A1
公开(公告)日：2004-03-04
申请号：CA2495986
申请日：2003-08-19
Applicant: QUALCOMM INC
Inventor： JAYARAMAN SRIKANT , FERNANDEZ CORBATON IVAN JESUS , SMEE JOHN E , HOWARD MICHAEL A
Abstract: Method for optimizing an equalizer at a receiver in a communication system b y training virtual parallel equalizers. Multiple configurations are applied fo r training an equalizer, and a performance measurement or estimate determined. The performance measures of the multiple configurations are compared to determine the optimum configuration. The training and selection are performe d at a rate sufficiently higher than the received sample rate as to allow optimization in between processing of data samples.
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公开(公告)号：CA2493106A1
公开(公告)日：2004-01-29
申请号：CA2493106
申请日：2003-07-18
Applicant: QUALCOMM INC
Inventor： SMEE JOHN E , FERNANDEZ CORBATON IVAN JESUS , JAYARAMAN SRIKANT
Abstract: A method and apparatus for a decision feedback equalizer wherein a correctio n term is used to compensate for slicer errors, thus avoiding error propagatio n. Filter coefficients for the equalizer are selected so as to minimize a cost function for the equalizer, including a correction term as a function of the energy of the filter coefficients. The equalizer includes a coefficient generator responsive to the correction term. One embodiment estimates a transmitted symbol from a received sample as a function of Signal-to- Interference and Noise Ratio (SINR) of the received sample. The received sample is quantized and mapped to a region of a grid overlaid on the transmitted symbol constellation. The region may correspond to a symbol estimate value or may be processed further to obtain a symbol estimate value .
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公开(公告)号：AU2003216045A1
公开(公告)日：2003-07-30
申请号：AU2003216045
申请日：2003-01-07
Applicant: QUALCOMM INC
Inventor： JAYARAMAN SRIKANT , CORBATON IVAN JESUS FERNANDEZ , SMEE JOHN E
IPC: H03M13/01 , H04B1/7105 , H04B1/712 , H04L1/00 , H04L1/02
Abstract: Methods and apparatus are presented herein for determining log likelihood ratios (LLRs) for code symbols. Pilot and code symbols are transmitted over diversity channels, which can be modeled as a slowly time varying system. A formulation for a multipath gain vector is derived herein based on the slowly time varying model. The multipath gain vector is then solved using iterative procedures. Using the solved multipath gain vector, the LLRs for code symbols are computed.
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Patent Agency Ranking56.发明专利
公开(公告)号：CA2465729A1
公开(公告)日：2003-05-15
申请号：CA2465729
申请日：2002-10-29
Applicant: QUALCOMM INC
Inventor： FERNANDEZ-CORBATON IVAN JESUS , JAYARAMAN SRIKANT , SMEE JOHN E
Abstract: Techniques for detecting and mitigating adjacent channel interference (ACI) in a wireless (e.g., CDMA) communication system. In one aspect, ACI may be determined by signaling or detected by filtering a pre-processed signal in each frequency range where ACI may be present (e.g., with a respective bandpass filter), estimating the energy of the filtered signal for each frequency range, comparing the estimated energy against an ACI threshold, an d indicating the presence or absence of ACI at each frequency range based on t he result of the comparison. In another aspect, a selectable filter (e.g., a FI R filter) having a number of possible filter responses (e.g., provided by a number of sets of filter coefficients) may be used to provide filtering for the pre-processed signal and to reject any detected ACI. One of the possible filter responses is selected for use depending on whether and where ACI has been detected.
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公开(公告)号：HUE049055T2
公开(公告)日：2020-08-28
申请号：HUE10012069
申请日：2004-01-07
Applicant: QUALCOMM INC
Inventor： SMEE JOHN E , WALTON JAY RODNEY , MALLADI DURGA PRASAD
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58.发明专利
公开(公告)号：ES2526553T3
公开(公告)日：2015-01-13
申请号：ES09791205
申请日：2009-08-06
Applicant: QUALCOMM INC
Inventor： HOU JILEI , FARAJIDANA AMIR , YANG LIN , SMEE JOHN E , HASSANPOUR GHADY NAVID , MALLIK SIDDHARTHA , MALLADI DURGA PRASAD
Abstract: Un aparato (102) de comunicaciones inalámbricas, que comprende: un medio para proporcionar cobertura de una primera célula (104i) mediante un primer sistema (106i) de antena; un medio para proporcionar cobertura de una segunda célula (104j) mediante un segundo sistema (106j) de antena; un medio de procesamiento de datos para su transmisión a un dispositivo móvil de la primera célula utilizando los primero y segundo sistemas de antena caracterizado por: un medio de generación de unas primera y segunda señales de referencia para su transmisión en las primera y segunda células, respectivamente; y un medio de punzonado (102) de los datos para su transmisión en la primera célula cuando las primera y segunda señales de referencia no entren en colisión y de punzonado (102) de la primera señal de referencia cuando las primera y segunda señales de referencia entren en colisión, para hacer posible que el dispositivo móvil genere la segunda estimación de canal procedente de la segunda señal de referencia.
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59.发明专利
公开(公告)号：CA2731098C
公开(公告)日：2014-11-04
申请号：CA2731098
申请日：2009-08-06
Applicant: QUALCOMM INC
Inventor： HOU JILEI , FARAJIDANA AMIR , YANG LIN , SMEE JOHN E , HASSANPOUR GHADY NAVID , MALLIK SIDDHARTHA , MALLADI DURGA PRASAD
Abstract: Systems and methods for providing coverage to a first cell (104i) through a first antenna system (106i) and coverage to a second cell (104 j) through a second antenna system (106g). Data is also processed for transmission to a mobile device (108i) in the first cell using the first and second antenna systems.
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60.发明专利
公开(公告)号：AU2009279485B2
公开(公告)日：2013-09-26
申请号：AU2009279485
申请日：2009-08-07
Applicant: QUALCOMM INC
Inventor： HOU JILEI , SMEE JOHN E , MALLADI DURGA PRASAD , HASSANPOUR GHADY NAVID , MALLIK SIDDHARTHA
Abstract: Techniques for supporting distributed multiple-input multiple-output (MIMO) transmissions are described. In one design, a user equipment (UE) determines channel estimates for multiple cells and reports the channel estimates. The UE thereafter receives a data transmission sent by the multiple cells to the UE based on the channel estimates. The data transmission may include at least one data stream, and each data stream may be sent by one cell or the multiple cells to the UE. In another design, a UE determines first and second channel estimates for first and second cells, respectively, and reports the channel estimates. The UE then receives a first data transmission sent by the first cell to the UE based on the first channel estimate. The UE also receives a second data transmission sent by the second cell to another UE and steered away from the UE based on the second channel estimate.
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