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公开(公告)号：MX2010003097A
公开(公告)日：2010-04-09
申请号：MX2010003097
申请日：2008-09-22
Applicant: QUALCOMM INC
Inventor： LEUNG GILBERT
IPC: H04L12/28
Abstract: Se describen t?cnicas para atenuar la interferencia en el enlace inverso de un sistema de comunicaci?n inal?mbrica. Las terminales que interfieren entre s? y se comunican con diferentes sectores por el enlace inverso pueden ser identificadas. Las terminales pueden programarse en intervalos de tiempo seleccionados para atenuar la interferencia. Por ejemplo, cada terminal puede ser programada: por lo menos en un intervalo de tiempo seleccionado en forma seudoaleatoria; en un entrelazado seleccionado en forma seudoaleatoria que incluye intervalos de tiempo uniformemente separados; en un conjunto diferente de por lo menos un intervalo de tiempo; en un entrelazado diferente; etc. Una terminal puede recibir la asignaci?n de por lo menos un intervalo de tiempo para la transmisi?n por el enlace inverso hacia un sector de servicio. Ese o esos intervalos de tiempo pueden seleccionarse de modo que aten?en la interferencia entre terminales en sectores vecinos.
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公开(公告)号：BR0009547A
公开(公告)日：2002-06-04
申请号：BR0009547
申请日：2000-04-10
Applicant: QUALCOMM INC
Inventor： LEUNG GILBERT
IPC: H04B1/7073 , H03M13/01 , H04B1/707 , H04L25/02 , H04Q7/38
Abstract: A method and apparatus for estimating channel conditions in a code-division multiple access (CDMA) communication system having a pilot signal and a traffic signal. The apparatus includes a pilot filter for generating channel estimates from the pilot signal and a circuit for reconstructing the traffic information bits after they have been decoded. A predictive channel estimation circuit generates predictive channel estimates from the original traffic signal demodulated by the reconstructed traffic information bits. A demodulator demodulates the traffic signal using the predictive channel estimates and the pilot signal channel estimates. By using the predictive channel estimates that contain signal energy from the traffic signal as a coherent reference, the channel conditions may be estimated more accurately than by using the pilot signal alone.
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公开(公告)号：NO20015548L
公开(公告)日：2002-01-14
申请号：NO20015548
申请日：2001-11-13
Applicant: QUALCOMM INC
Inventor： LING FUNYUN , HOLTZMAN JACK M , WHEATLEY III CHARLES E , CHEN TAO , TIEDEMANN JR EDWARD G , LEUNG GILBERT
Abstract: A method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system. The method includes when the pilot signal is transmitted by the mobile station that is power controlled to a target receive level, the traffic channel power level is increased relative to the pilot channel to improve receiver performance. An improved feature is that the received pilot received at the base station stays the same while the receiver receives extra energy in the redundant traffic symbols received to enhance the probability of correctly decoding the received frame. The base station detects the absence of the mobile station transmitted signal from the frequency of interest. If the base station is aware of the starting time and duration of the absence, it can focus its detection during this predetermined time period. The performance can be improved if the absence of the signal is spread across two frames at the frame boundary.
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公开(公告)号：AU6647400A
公开(公告)日：2001-03-19
申请号：AU6647400
申请日：2000-08-16
Applicant: QUALCOMM INC
Inventor： LEUNG GILBERT
Abstract: A method and circuit for adaptively estimating channel conditions of a pilot channel in a wireless communication system. The method includes estimating channel statistics of the pilot channel, and adaptively filtering the pilot channel in response to the estimated channel statistics. The estimation is performed by filtering a channel signal derived from the pilot channel to determine an estimated channel mean and an estimated channel covariance. In order to perform the adaptive filtering, the present invention partitions the pilot channel into one or more time slots and weights each time slot according to the channel statistics. Thus, an advantage of the present invention is that it automatically and continually updates the pilot filter parameters in order to optimize the pilot filter performance over a broad range of channel conditions.
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公开(公告)号：AU4999800A
公开(公告)日：2000-12-05
申请号：AU4999800
申请日：2000-05-09
Applicant: QUALCOMM INC
Inventor： LING FUNYUN , HOLTZMAN JACK , WHEATLEY CHARLES E III , CHEN TAO , TIEDEMANN EDWARD G JR , LEUNG GILBERT
Abstract: A method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system. The method includes when the pilot signal is transmitted by the mobile station that is power controlled to a target receive level, the traffic channel power level is increased relative to the pilot channel to improve receiver performance. An improved feature is that the received pilot received at the base station stays the same while the receiver receives extra energy in the redundant traffic symbols received to enhance the probability of correctly decoding the received frame. The base station detects the absence of the mobile station transmitted signal from the frequency of interest. If the base station is aware of the starting time and duration of the absence, it can focus its detection during this predetermined time period. The performance can be improved if the absence of the signal is spread across two frames at the frame boundary.
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Patent Agency Ranking
公开(公告)号：BRPI0817001A2
公开(公告)日：2015-03-31
申请号：BRPI0817001
申请日：2008-09-22
Applicant: QUALCOMM INC
Inventor： LEUNG GILBERT
IPC: H04L12/28
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公开(公告)号：AT432558T
公开(公告)日：2009-06-15
申请号：AT00922006
申请日：2000-04-10
Applicant: QUALCOMM INC
Inventor： LEUNG GILBERT
IPC: H04B1/7073 , H03M13/01 , H04B1/707 , H04L25/02 , H04Q7/38
Abstract: A method and apparatus for estimating channel conditions in a code-division multiple access (CDMA) communication system having a pilot signal and a traffic signal. The apparatus includes a pilot filter for generating channel estimates from the pilot signal and a circuit for reconstructing the traffic information bits after they have been decoded. A predictive channel estimation circuit generates predictive channel estimates from the original traffic signal demodulated by the reconstructed traffic information bits. A demodulator demodulates the traffic signal using the predictive channel estimates and the pilot signal channel estimates. By using the predictive channel estimates that contain signal energy from the traffic signal as a coherent reference, the channel conditions may be estimated more accurately than by using the pilot signal alone.
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公开(公告)号：CA2696673A1
公开(公告)日：2009-03-26
申请号：CA2696673
申请日：2008-09-22
Applicant: QUALCOMM INC
Inventor： LEUNG GILBERT
IPC: H04J3/00
Abstract: Techniques for mitigating interference on the reverse link in a wireless communication system are described. Terminals interfering with one another and communicating with different sectors on the reverse link may be identified. The terminals may be scheduled in time intervals selected to mitigate interference. For example, each terminal may be scheduled on at least one pseudo-randomly selected time interval, on a pseudo-randomly selected interlace that includes evenly spaced time intervals, on a different set of at least one time interval, on a different interlace, etc. A terminal may receive an assignment of at least one time interval for transmission on the reverse link to a serving sector. The at least one time interval may be selected to mitigate interference to terminals in neighbor sectors.
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公开(公告)号：BR0010474A
公开(公告)日：2002-12-31
申请号：BR0010474
申请日：2000-05-09
Applicant: QUALCOMM INC
Inventor： LING FUNYUN , HOLTZMAN JACK , WHEATLEY CHARLES E III , CHEN TAO , TIEDEMANN EDWARD G , LEUNG GILBERT
Abstract: A method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system. The method includes when the pilot signal is transmitted by the mobile station that is power controlled to a target receive level, the traffic channel power level is increased relative to the pilot channel to improve receiver performance. An improved feature is that the received pilot received at the base station stays the same while the receiver receives extra energy in the redundant traffic symbols received to enhance the probability of correctly decoding the received frame. The base station detects the absence of the mobile station transmitted signal from the frequency of interest. If the base station is aware of the starting time and duration of the absence, it can focus its detection during this predetermined time period. The performance can be improved if the absence of the signal is spread across two frames at the frame boundary.
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公开(公告)号：BR0013506A
公开(公告)日：2002-12-03
申请号：BR0013506
申请日：2000-08-16
Applicant: QUALCOMM INC
Inventor： LEUNG GILBERT
Abstract: A method and circuit for adaptively estimating channel conditions of a pilot channel in a wireless communication system. The method includes estimating channel statistics of the pilot channel, and adaptively filtering the pilot channel in response to the estimated channel statistics. The estimation is performed by filtering a channel signal derived from the pilot channel to determine an estimated channel mean and an estimated channel covariance. In order to perform the adaptive filtering, the present invention partitions the pilot channel into one or more time slots and weights each time slot according to the channel statistics. Thus, an advantage of the present invention is that it automatically and continually updates the pilot filter parameters in order to optimize the pilot filter performance over a broad range of channel conditions.
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