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公开(公告)号：AU692487B2
公开(公告)日：1998-06-11
申请号：AU8096294
申请日：1994-10-27
Applicant: QUALCOMM INC
Inventor： SIH GILBERT C , ANTONIO FRANKLIN P
Abstract: An apparatus that automatically adjusts the adaptation block size for a least-mean square (LMS) adaptive filter depending on the input signal-to-noise ratio (SNR) is disclosed. The apparatus monitors the instantaneous SNR and continually adjusts the block size to provide high noise immunity, thereby increasing the convergence speed of the filter and decreasing the asymptotic mean-square error. An exemplary embodiment of the present invention is presented in the context of acoustic echo cancellation, though it is noted that the adaptive filter of the present invention is useful in any environment in which the noise characteristics are subject to change.
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公开(公告)号：FI974421A
公开(公告)日：1998-02-04
申请号：FI974421
申请日：1997-12-05
Applicant: QUALCOMM INC
Inventor： DEAN RICHARD F , ANTONIO FRANKLIN P
IPC: H04B5/00 , H01Q13/22 , H01Q21/29 , H04B7/02 , H04B7/04 , H04B7/06 , H04B7/08 , H04B7/26 , H04J13/02 , H04W36/18 , H04W88/08 , H04B
Abstract: A linear coverage area antenna system for use within a CDMA communication system is disclosed herein. In a preferred implementation, two linear coverage area antenna structures (210', 212') are positioned in parallel and coupled to a base station (200'). Within the base station (200'), a transmitter (220') generates remote user directed spread spectrum signals, these signals being provided to the first and second linear coverage area antenna structures (210', 212') through an antenna interface. The antenna interface includes a time delay element (292) for introducing a predetermined time delay between components of the remote user directed spread spectrum signals transmitted by the first and second linear coverage area antenna structures (210', 212'), respectively. The base station (220') also further includes at least a first demodulation element (510A) for demodulating an aggregate spread spectrum signal comprised of a plurality of system user directed spread spectrum signals received by the first linear coverage area antenna structure (210') and a second demodulation element (515A) for demodulating a second aggregate spread spectrum signal comprised of a plurality of system user directed spread spectrum signals received by the second linear coverage area antenna structure (212').
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公开(公告)号：AU685966B2
公开(公告)日：1998-01-29
申请号：AU2908695
申请日：1995-06-22
Applicant: QUALCOMM INC
Inventor： ANTONIO FRANKLIN P , GILHOUSEN KLEIN S , WOLF JACK K , ZEHAVI EPHRAIM
IPC: H01Q3/24 , H01Q3/26 , H04B1/7085 , H04B1/7117 , H04B1/712 , H04B7/26 , H04L1/06 , H04W16/28 , H04Q7/36
Abstract: A system and method for adaptively sectorizing channel resources within a digital cellular communication system is disclosed herein. The system includes an antenna arrangement for providing at least first and second electromagnetic beams for receiving a first information signal transmitted by a specific one of a plurality of users, thereby generating first and second received signals. A first set of beam-forming signals are then generated from the first and second received signals. A demodulating receiver is provided for demodulating at least first and second beam-forming signals included within the first set of beam-forming signals, thereby producing first and second demodulated signals. The system further includes a tracking network for tracking multipath information signals, received from various positions and angles of incidence, based on comparison of the first and second demodulated signals.
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公开(公告)号：FI974421A0
公开(公告)日：1997-12-05
申请号：FI974421
申请日：1997-12-05
Applicant: QUALCOMM INC
Inventor： DEAN RICHARD F , ANTONIO FRANKLIN P
IPC: H04B5/00 , H01Q13/22 , H01Q21/29 , H04B7/02 , H04B7/04 , H04B7/06 , H04B7/08 , H04B7/26 , H04J13/02 , H04W36/18 , H04W88/08 , H04B
Abstract: A linear coverage area antenna system for use within a CDMA communication system is disclosed herein. In a preferred implementation, two linear coverage area antenna structures (210', 212') are positioned in parallel and coupled to a base station (200'). Within the base station (200'), a transmitter (220') generates remote user directed spread spectrum signals, these signals being provided to the first and second linear coverage area antenna structures (210', 212') through an antenna interface. The antenna interface includes a time delay element (292) for introducing a predetermined time delay between components of the remote user directed spread spectrum signals transmitted by the first and second linear coverage area antenna structures (210', 212'), respectively. The base station (220') also further includes at least a first demodulation element (510A) for demodulating an aggregate spread spectrum signal comprised of a plurality of system user directed spread spectrum signals received by the first linear coverage area antenna structure (210') and a second demodulation element (515A) for demodulating a second aggregate spread spectrum signal comprised of a plurality of system user directed spread spectrum signals received by the second linear coverage area antenna structure (212').
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公开(公告)号：CA2251830A1
公开(公告)日：1997-10-23
申请号：CA2251830
申请日：1997-04-15
Applicant: QUALCOMM INC
Inventor： GILHOUSEN KLEIN S , ANTONIO FRANKLIN P
Abstract: A system and method for reducing radio frequency interference arising in connection with pulsed transmission over time division multiplexed communication channels. In a first embodiment, a subscriber station (300) is nominally assigned all of the slots (TN0-TN7) of each frame of a first transmit channel (R0). By transmitting RF energy substantially continuously, the subscriber station reduces interference arising from pulsed transmission. In a second embodiment, a subscriber station (300) is nominally assigned one or more slots (TN0-TN7) of each frame of a primary channel (R0) for conventional transmission of useful information, and is also instructed to continuously transmit RF energy over an auxiliary channel (R1) at times other than during the assigned primary channel slots. In this way, interference generated in the vicinity of the subscriber station (300) is reduced due to the substantially continuous transmission of RF energy by the subscriber station (300). More than one subscriber station (300) may simultaneously utilize the auxiliary channel (R1) during reduced interference mode operation.
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Patent Agency Ranking
公开(公告)号：AT152559T
公开(公告)日：1997-05-15
申请号：AT89902364
申请日：1988-12-21
Applicant: QUALCOMM INC
Inventor： GILHOUSEN KLEIN S , ANTONIO FRANKLIN P , JACOBS IRWIN M , WEAVER LINDSAY A JR
IPC: G02B6/293 , G02B6/34 , G02B6/42 , H01S3/08 , H01S5/14 , H01S5/40 , H04B1/7136 , H04B7/212 , H04B10/155 , H04L5/16 , H04B7/26 , H04J3/26
Abstract: A message communication system employing one or more centralized communication stations transferring messages through Earth orbit repeater satellites to or from mobile terminals with at least one central communication station having a first transceiver for transmitting a first communication signal to one or more mobile terminals and at least one mobile terminal having a second transceiver for receiving the first communication signal and demodulating it, and for transmitting at a predetermined duty cycle of the second transceiver, a second communication signal to at least one of the central communication stations. The preferred duty cycle over which the second communication signal is transmitted is about fifty percent of the second transceiver duty cycle. The communication system uses Time Division Multiplexed (TDM) communication signals using a number of channels as designated address channels with the remainder being used for data transfer. Information transmitted on the address channels is used by terminals to determine both the presence of a message and its corresponding data transmission or reception channel. In addition the terminals use the reception of the first communication signal to adjust return link transmission frequency to compensate for transmission path errors. The alternating duty cycle allows mobile terminals to use a single set of local oscillators for both transmission and reception modes of operation. To decrease interference with other systems the present system employs a power dispersal modulation function to achieve the footprint of a video signal for high transfer rate digital communication signals.
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公开(公告)号：AT148965T
公开(公告)日：1997-02-15
申请号：AT94926602
申请日：1994-08-24
Applicant: QUALCOMM INC
Inventor： DEAN RICHARD F , ANTONIO FRANKLIN P , GILHOUSEN KLEIN S , WHEATLEY CHARLES E III
IPC: H04B7/04 , H01Q21/29 , H04B7/02 , H04B7/06 , H04B7/08 , H04B7/26 , H04W36/18 , H04W88/08 , H04Q7/36
Abstract: A distributed antenna system is utilized in a system for providing multipath signals which facilitate signal diversity for enhanced system performance. Each node of the antenna comprises more than one antenna. Each antenna at a common node provides a path having a different delay to the base station.
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公开(公告)号：FI965180A0
公开(公告)日：1996-12-20
申请号：FI965180
申请日：1996-12-20
Applicant: QUALCOMM INC
Inventor： ANTONIO FRANKLIN P , WOLF JACK K , GILHOUSEN KLEIN S , ZEHAVI EPHRAIM
IPC: H01Q3/26 , H01Q3/24 , H04B1/7085 , H04B1/7117 , H04B1/712 , H04B7/26 , H04L1/06 , H04W16/28 , H04B
Abstract: A system and method for adaptively sectorizing channel resources within a digital cellular communication system is disclosed herein. The system includes an antenna arrangement for providing at least first and second electromagnetic beams for receiving a first information signal transmitted by a specific one of a plurality of users, thereby generating first and second received signals. A first set of beam-forming signals are then generated from the first and second received signals. A demodulating receiver is provided for demodulating at least first and second beam-forming signals included within the first set of beam-forming signals, thereby producing first and second demodulated signals. The system further includes a tracking network for tracking multipath information signals, received from various positions and angles of incidence, based on comparison of the first and second demodulated signals.
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公开(公告)号：FI961824A
公开(公告)日：1996-06-28
申请号：FI961824
申请日：1996-04-29
Applicant: QUALCOMM INC
Inventor： SIH GILBERT C , ANTONIO FRANKLIN P
Abstract: An apparatus that automatically adjusts the adaptation block size for a least-mean square (LMS) adaptive filter depending on the input signal-to-noise ratio (SNR) is disclosed. The apparatus monitors the instantaneous SNR and continually adjusts the block size to provide high noise immunity, thereby increasing the convergence speed of the filter and decreasing the asymptotic mean-square error. An exemplary embodiment of the present invention is presented in the context of acoustic echo cancellation, though it is noted that the adaptive filter of the present invention is useful in any environment in which the noise characteristics are subject to change.
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公开(公告)号：ZA9408430B
公开(公告)日：1995-06-29
申请号：ZA9408430
申请日：1994-10-26
Applicant: QUALCOMM INC
Inventor： SIH GILBERT C , ANTONIO FRANKLIN P
CPC classification number: H04B3/23 , H03H21/0012
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