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公开(公告)号：CA2253487A1
公开(公告)日：1999-05-26
申请号：CA2253487
申请日：1998-11-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： RUCKI JOHN STANLEY , ZAPPALA CHRISTOPHER F , WEN JACK CHI-CHIEH
IPC: H04B1/48 , H04B1/18 , H04B7/26 , H04B17/00 , H04B17/40 , H04Q7/22 , H04Q7/24 , H04Q7/26 , H04Q7/30 , H04Q7/38 , H04Q7/36
Abstract: A wireless base station has a transmitter and receiver. Transmission signals are applied to an antenna through a transmit bandpass filter that is tuned for a transmit band of frequencies. Received signals from the antenna are applied to the receiver through a receive bandpass filter that is tuned for a receive band of frequencies An RF switching array consisting of four RF switch es interconnects the output of the transmitter and the input of the receiver such that normal, lo opback (self-test), and scanning modes can be performed. In the normal mode, the antenna is connected to the transmitter and receiver through the transmit and receive bandpass filters, respectively. Th e transmit and signal paths are effectively isolated from each other by three serially-connected open switches. In the loopback mode, the transmitter output is connected to the receiver input. In the scanning mode, the antenna is connected to the receiver through the transmit bandpass filter. The s ame set of interconnects provides for loopback and normal operation as well as the new scan ning operation. The use of switches rather than couplers or couplers for the loopback function reduc es noise and crosstalk between transmit and receive signal lines and lower losses in these lines.
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公开(公告)号：DE69902604D1
公开(公告)日：2002-10-02
申请号：DE69902604
申请日：1999-05-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： PAGANO II , RUCKI JOHN STANLEY , WEN JACK CHI-CHIEH , ZAPPALA CHRISTOPHER F
IPC: H04B1/40 , H04B1/00 , H04B1/10 , H04B1/12 , H04B1/38 , H04B1/50 , H04B7/00 , H04B7/005 , H04B7/155 , H04B7/26 , H04Q7/30
Abstract: A communication system reduces the transmitter (13) overloading a transmit scanning receiver (17) by reducing transmitter signals transmitted from an overloading transmitter and received by the transmit scanning receiver. A sample of a transmitter signal to be transmitted is obtained (in 10a) from the transmitter before transmission. After the transmitter signal is transmitted and received by the transmit scanning receiver, the sample is used to reduce the transmitter signal at the transmit scanning receiver. To do so, the sample is delayed (24), adjusted (34) and combined (36) with the transmitter signal. In certain embodiments, a portion of a transmitter signal is obtained from a transmit path of a transmitter prior to transmission and put on a coupled path. The transmitter signal on the coupled path is adjusted and injected into a transmit scanning path of the transmit scanning receiver to combine with a transmitter signal which was transmitted by the transmitter and received at the transmit scanning receiver. A delay element in the coupled path is used to adjust the delay on the coupled path to correspond to the delay experienced by the transmitter signal which was transmitted by the transmitter and then received by the transmit scanning receiver. Amplitude and phase adjusters on the coupled path amplitude and phase adjust the transmitter signal on the coupled path to reduce the transmitter signal on the transmit scanning path. To improve the reduction of the transmitter signal on the transmit scanning path, measurements of at least the transmitter signal on the transmit scanning path can be made, and the measurements can be used to adjust the phase and/or amplitude of the transmitter signals on the coupled path to reduce the level of the transmitter signal on the transmit scanning path. Furthermore, successive cancellation stages (10n) comprising parallel coupled paths can be implemented to provide more suppression of the transmitter signal on the transmit scanning path.
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公开(公告)号：DE69900378T2
公开(公告)日：2002-09-05
申请号：DE69900378
申请日：1999-06-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BURKE MICHAEL EUGENE , LIPOWSKI JOSEPH THADDEUS , O'BOYLE LEONARD EDWARD , VAN DYKE RULON G , WEN JACK CHI-CHIEH
Abstract: A receiver desensitization system sets the sensitivity of a receiver by injecting a desensitization signal appearing as noise onto a receive path of the receiver to adjust the noise power level relative to the power level of signals on the receive path. For example, a desensitization source (18) provides a desensitization signal appearing as noise onto a desensitization path. An adjustable attenuator (26) on the desensitization path adjusts the power level of the desensitization signal to provide a desired level of desensitization. The desensitization path is coupled (at 28) to a receive path of a receiver, and the desensitization signal is injected into the receive path. The desensitization signal desensitizes the receiver by raising the noise power level relative to the signal power level on the receive path. The desensitization signal can be injecting into the receive path after a main amplifier (22) on the receive path. By injecting the desensitization signal after the amplifier, the desensitization system reduces the contribution to the overall noise figure that would occur if any attenuation of the signal were to occur before the input to the amplifier. Depending on the application, the desensitization signal can be injected into the receive path at the radio frequency (RF), intermediate frequency (IF) or baseband stages of the receiver. The desensitization signal can take a variety of forms, such as broadband noise, a continuous wave signal, a modulated signal, or a digital pseudo-random noise sequence.
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公开(公告)号：CA2253487C
公开(公告)日：2002-04-16
申请号：CA2253487
申请日：1998-11-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WEN JACK CHI-CHIEH , ZAPPALA CHRISTOPHER F , RUCKI JOHN STANLEY
IPC: H04B1/48 , H04B1/18 , H04B7/26 , H04B17/00 , H04B17/40 , H04Q7/22 , H04Q7/24 , H04Q7/26 , H04Q7/30 , H04Q7/38 , H04Q7/36
Abstract: A wireless base station has a transmitter and receiver. Transmission signals are applied to an antenna through a transmit bandpass filter that is tuned for a transmit band of frequencies. Received signals from the antenna are applied to the receiver through a receive bandp ass filter that is tuned for a receive band of frequencies An RF switching array consisting of four RF sw itches interconnects the output of the transmitter and the input of the receiver such that normal , loopback (self-test), and scanning modes can be performed. In the normal mode, the antenna is connecte d to the transmitter and receiver through the transmit and receive bandpass filters, respectively . The transmit and signal paths are effectively isolated from each other by three serially-connected o pen switches. In the loopback mode, the transmitter output is connected to the receiver input. In the scanning mode, the antenna is connected to the receiver through the transmit bandpass filter. T he same set of interconnects provides for loopback and normal operation as well as the new scanning operation. The use of switches rather than couplers or couplers for the loopback function r educes noise and crosstalk between transmit and receive signal lines and lower losses in these lines.
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公开(公告)号：DE69900116D1
公开(公告)日：2001-06-28
申请号：DE69900116
申请日：1999-06-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MYER ROBERT EVAN , PATEL MOHAN , WEN JACK CHI-CHIEH
Abstract: An A/D system (10) provides an expanded SFDR when compared to the SFDR of individual A/D(s) that make up the A/D system. In response to an analog input signal(s) whose amplitude would result in a narrower SFDR for a first A/D (12), the A/D system uses an amplitude adjuster (14) which receives the analog input signal and produces an amplitude-limited signal with resulting signal distortion (S + D) to the first A/D (12). By amplitude-limiting the analog input signal, the A/D system produces the resulting signal distortion but reduces or "clips" the amplitude of the analog input signal, thereby improving the SFDR performance of the first A/D by reducing the spurious distortion produced by the first A/D. The signal distortion (D) resulting from the amplitude adjustment is routed to a second A/D (15). The first A/D converts the amplitude-limited analog signal to a digital signal (S + D ) with an expanded SFDR due to the lower amplitude of the adjusted analog signal. The second A/D (15) receives the portion of the analog input signal removed by clipping which can be referred to as the signal distortion (D). The second A/D converts the signal distortion, which typically has a lower amplitude than the adjusted analog signal, to a digital signal (D1) with at least an acceptable SFDR. The A/D system combines (16) the resulting digital signals from the first and second A/Ds to produce the desired converted digital signal with an extended SFDR. The SFDR is extended because the relative difference is increased between the amplitudes of the digital output signal and the spurious distortion when compared to the amplitudes of the digital output signal and the spurious distortion if the analog input signal has been converted by the first A/D without amplitude adjustment.
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Patent Agency Ranking
公开(公告)号：CA2267714A1
公开(公告)日：1999-11-13
申请号：CA2267714
申请日：1999-03-24
Applicant: LUCENT TECHNOLOGIES INC
IPC: H04B1/40 , H04B1/00 , H04B1/10 , H04B1/12 , H04B1/38 , H04B1/50 , H04B7/00 , H04B7/005 , H04B7/155 , H04B7/26 , H04Q7/30
Abstract: A communication system reduces the transmitter overloading of a transmit scanning receiver by reducing transmitter signals transmitted from an overloading transmitter and received by the transmit scanning receiver. A sample of a transmitter signal to be transmitted is obtained from the transmitter before transmission. After the transmitter signal is transmitted and received by the transmit scanning receiver, the sample is used to reduce the transmitter signal at the transmit scanning receiver. To do so, the sample is delayed, adjusted and combined with the transmitter signal. In certain embodiments, a portion of a transmitter signal is obtained from a transmit path of a transmitter prior to transmission and put on a coupled path. The transmitter signal on the coupled path is adjusted and injected into a transmit scanning path of the transmit scanning receiver to combine with a transmitter signal which was transmitted by the transmitter and received at the transmit scanning receiver. A delay element in the coupled path is used to adjust the delay on the coupled path to correspond to the delay experienced by the transmitter signal which was transmitted by the transmitter and then received by the transmit scanning receiver. Amplitude and phase adjusters on the coupled path amplitude and phase adjust the transmitter signal on the coupled path to reduce the transmitter signal on the transmit scanning path. To improve the reduction of the transmitter signal on the transmit scanning path, measurements of at least the transmitter signal on the transmit scanning path can be made, and the measurements can be used to adjust the phase and/or amplitude of the transmitter signals on the coupled path to reduce the level of the transmitter signal on the transmit scanning path. Furthermore, successive cancellation stages comprising parallel coupled paths can be implemented to provide more suppression of the transmitter signal on the transmit scanning path.
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公开(公告)号：CA2194924A1
公开(公告)日：1997-08-17
申请号：CA2194924
申请日：1997-01-13
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MYER ROBERT EVAN , WEN JACK CHI-CHIEH
Abstract: A wireless communication system or method capable of providing both a two-way telephone service and a two-way paging service on the same infrastructure. The system or method is capable of distinguishing whether a subscriber is a telephone or paging subscriber. If the subscriber is a two-way paging subscriber, the system or method allows the calling party to have the capability of conversing directly with the called party for a limited time or the options of leaving voice, numeric or alphanumeric messages for the called party to retrieve later.
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公开(公告)号：DE69933259D1
公开(公告)日：2006-11-02
申请号：DE69933259
申请日：1999-06-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WEN JACK CHI-CHIEH
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公开(公告)号：AU761004B2
公开(公告)日：2003-05-29
申请号：AU3507399
申请日：1999-06-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BURKE MICHAEL EUGENE , LIPOWSKI JOSEPH THADDEUS , O'BOYLE LEONARD EDWARD , VANDYKE RULON G , WEN JACK CHI-CHIEH
Abstract: A receiver desensitization system sets the sensitivity of a receiver by injecting a desensitization signal appearing as noise onto a receive path of the receiver to adjust the noise power level relative to the power level of signals on the receive path. For example, a desensitization source (18) provides a desensitization signal appearing as noise onto a desensitization path. An adjustable attenuator (26) on the desensitization path adjusts the power level of the desensitization signal to provide a desired level of desensitization. The desensitization path is coupled (at 28) to a receive path of a receiver, and the desensitization signal is injected into the receive path. The desensitization signal desensitizes the receiver by raising the noise power level relative to the signal power level on the receive path. The desensitization signal can be injecting into the receive path after a main amplifier (22) on the receive path. By injecting the desensitization signal after the amplifier, the desensitization system reduces the contribution to the overall noise figure that would occur if any attenuation of the signal were to occur before the input to the amplifier. Depending on the application, the desensitization signal can be injected into the receive path at the radio frequency (RF), intermediate frequency (IF) or baseband stages of the receiver. The desensitization signal can take a variety of forms, such as broadband noise, a continuous wave signal, a modulated signal, or a digital pseudo-random noise sequence.
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公开(公告)号：DE69902604T2
公开(公告)日：2003-04-10
申请号：DE69902604
申请日：1999-05-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： PAGANO II , RUCKI JOHN STANLEY , WEN JACK CHI-CHIEH , ZAPPALA CHRISTOPHER F
IPC: H04B1/40 , H04B1/00 , H04B1/10 , H04B1/12 , H04B1/38 , H04B1/50 , H04B7/00 , H04B7/005 , H04B7/155 , H04B7/26 , H04Q7/30
Abstract: A communication system reduces the transmitter (13) overloading a transmit scanning receiver (17) by reducing transmitter signals transmitted from an overloading transmitter and received by the transmit scanning receiver. A sample of a transmitter signal to be transmitted is obtained (in 10a) from the transmitter before transmission. After the transmitter signal is transmitted and received by the transmit scanning receiver, the sample is used to reduce the transmitter signal at the transmit scanning receiver. To do so, the sample is delayed (24), adjusted (34) and combined (36) with the transmitter signal. In certain embodiments, a portion of a transmitter signal is obtained from a transmit path of a transmitter prior to transmission and put on a coupled path. The transmitter signal on the coupled path is adjusted and injected into a transmit scanning path of the transmit scanning receiver to combine with a transmitter signal which was transmitted by the transmitter and received at the transmit scanning receiver. A delay element in the coupled path is used to adjust the delay on the coupled path to correspond to the delay experienced by the transmitter signal which was transmitted by the transmitter and then received by the transmit scanning receiver. Amplitude and phase adjusters on the coupled path amplitude and phase adjust the transmitter signal on the coupled path to reduce the transmitter signal on the transmit scanning path. To improve the reduction of the transmitter signal on the transmit scanning path, measurements of at least the transmitter signal on the transmit scanning path can be made, and the measurements can be used to adjust the phase and/or amplitude of the transmitter signals on the coupled path to reduce the level of the transmitter signal on the transmit scanning path. Furthermore, successive cancellation stages (10n) comprising parallel coupled paths can be implemented to provide more suppression of the transmitter signal on the transmit scanning path.
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