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公开(公告)号：DE60040604D1
公开(公告)日：2008-12-04
申请号：DE60040604
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：NO20015548D0
公开(公告)日：2001-11-13
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：AU2008302092A1
公开(公告)日：2009-03-26
申请号：AU2008302092
申请日：2008-09-22
Applicant: QUALCOMM INC
Inventor： LEUNG GILBERT
IPC: H04L12/28
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：CA2371475A1
公开(公告)日：2000-11-23
申请号：CA2371475
申请日：2000-05-09
Applicant: QUALCOMM INC
Inventor： WHEATLEY CHARLES E III , HOLTZMAN JACK , LING FUYUN , TIEDEMANN EDWARD G JR , LEUNG GILBERT , CHEN TAO
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 stati on that is power controlled to a target receive level, the traffic channel powe r 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 bas e station is aware of the starting time and duration of the absence, it can focus its detection during this predetermined time period. The performance c an 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：AU4225400A
公开(公告)日：2000-10-23
申请号：AU4225400
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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Patent Agency Ranking
公开(公告)号：CA2368430A1
公开(公告)日：2000-10-12
申请号：CA2368430
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 code-division multiple access (CDMA) communications device receives a pilo t signal and a traffic signal. The traffic signal, once decoded (220), is re- encoded (302), interleaved (304) and compared (305) with a delayed (307) undecoded traffic signal. The delay matches computation delays. The comparis on of re-encoded and undecoded traffic signals is a measure of channel conditions. This measure may thus be combined (308) with a measure from the pilot signal to give a better estimate of channel conditions than would be possible using the pilot signal alone.
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公开(公告)号：DE60042269D1
公开(公告)日：2009-07-09
申请号：DE60042269
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：AT412274T
公开(公告)日：2008-11-15
申请号：AT00954139
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：HK1044234A1
公开(公告)日：2002-10-11
申请号：HK02105719
申请日：2002-08-06
Applicant: QUALCOMM INC
Inventor： LEUNG GILBERT
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：NO20015548A
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
CPC classification number: H04W52/225 , H04W36/0094 , H04W52/40 , H04W52/42
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