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公开(公告)号：JP2001237858A
公开(公告)日：2001-08-31
申请号：JP2001004769
申请日：2001-01-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DIEPSTRATEN WILHELMUS , KAMERMAN ADRIAAN , MOELARD HENDRIK
Abstract: PROBLEM TO BE SOLVED: To provide a communication method more immune to every kind of interference than a conventional method. SOLUTION: This invention provides a method and a device that allow transmitters (2, 6) to communicate at least one data packet with a prescribed packet size to a receiver via a communication channel (3). The transmitters (2, 6) have a memory (21) to store a common set of a data rate. This method includes a step where the transmitters (2, 6) divide at least one packet into many frames each having a prescribed frame size, a step where one combination of the frame size and any of the common set of the data set is automatically selected so as to limit a transmission time of each frame to a prescribed value and a step where the transmitters (2, 6) transmit each frame via the communication channel (3).
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公开(公告)号：JPH11163897A
公开(公告)日：1999-06-18
申请号：JP26754198
申请日：1998-09-22
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KAMERMAN ADRIAAN , MONTEBAN LEO , MUD RIENK
Abstract: PROBLEM TO BE SOLVED: To avoid collision, to enhance the availability of a common channel medium and to reduce the powder consumption of a mobile station by allowing a network station to set suspension threshold that suspends the transmission for a data signal when a signal that exceeds threshold is received to higher sensitivity than carrier detection threshold that performs receiving processing when the signal that exceeds threshold is received. SOLUTION: Mobile network stations 18 receive a signal on time slot base during a receiving mode and a carrier detection threshold circuit 70 and a suspension threshold circuit 72 decide the energy level of an incoming signal. When the circuit 72 detects a signal whose level exceeds threshold, it outputs a suspension instruction signal which notifies that sending can not be performed to prevent collision to a signal processing circuit 76. When a signal level increases and the circuit 70 detects a signal whose level exceeds threshold, it outputs a detection signal to the circuit 76 and the circuit 76 starts receiving processing.
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公开(公告)号：JPH10215205A
公开(公告)日：1998-08-11
申请号：JP35439297
申请日：1997-12-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KAMERMAN ADRIAAN , DRIEST HANS VAN
Abstract: PROBLEM TO BE SOLVED: To permit the preamble part of a data packet to immediately execute training for using minimum preamble continuing time by acquiring the weight coefficient of phase information from a symbol in the packet and detecting a channel, based on an average value to which phase information is weighted. SOLUTION: The front end of a detector/decoder 360 has a look-up table 705. The table 705 converts twenty two samples of I/Q input signals into twenty two polarity samples, namely, squared modulus components R and phase components ϕ. A vector integrator 710 receives the R samples, stores the respective samples in one of twenty two samples per symbol, integrates them and generates the average (integrated) R value for the twenty two samples per symbol. The vector integrator 710 excuses addition/integration for the eight continuous symbol intervals when a training process starts. A window integrator 730 is used for a timing reproduction process.
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公开(公告)号：DE69837697D1
公开(公告)日：2007-06-14
申请号：DE69837697
申请日：1998-09-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KAMERMAN ADRIAAN , MUD RIENK , MONTEBAN LEO
IPC: H04L12/28 , H04B7/005 , H04L12/413 , H04W52/18 , H04W74/08
Abstract: A method of operating a wireless local area network station (40) adapted to transmit and receive a signal within a communication cell (30) includes the steps of establishing a carrier detect threshold level (32-2), establishing a defer threshold level (38), and transmitting a signal when the signal level detected by the network station (40) is above the defer threshold level (38). Additionally, the method includes the step of receiving a signal transmission intended for the network station (40) when the power of the received signal transmission is above the carrier detect thr eshold level (32-2).
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公开(公告)号：NO973466A
公开(公告)日：1998-02-02
申请号：NO973466
申请日：1997-07-28
Applicant: LUCENT TECHNOLOGIES INC
Inventor： AWATER GEERT ARNOUT , KAMERMAN ADRIAAN , KRISHNAKUMAR ANJUR SUNDARESAN , NEE DIDIER J R VAN
CPC classification number: H04L23/02 , H04J13/10 , H04L27/2602 , H04L27/2617 , H04L27/2621
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Patent Agency Ranking
公开(公告)号：DE69739754D1
公开(公告)日：2010-03-25
申请号：DE69739754
申请日：1997-12-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KAMERMAN ADRIAAN , VAN DRIEST HANS
Abstract: For use in a direct sequence spread spectrum ("DSSS") receiver adapted to receive a differential phase shift keyed ("DPSK") packet on a channel, the DPSK packet having a training preamble and a data portion, a system to improve detection of the packet under degraded channel conditions, comprising: (1) a detection circuit that derives phase information from symbols in the packet and a weight that is a function of an estimated power profile for the channel and (2) a computation circuit that computes a weighted average for the phase information using the weight, the weighted average being power profile-based to allow the receiver to detect the data contained in the packet more reliably under the degraded channel conditions.
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公开(公告)号：CA2246470C
公开(公告)日：2003-07-29
申请号：CA2246470
申请日：1998-09-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BOER JAN , DIEPSTRATEN WILHELMUS JOSEPHUS , VAN BOKHORST HENDRIK , MUD RIENK , KOPMEINERS ROBERT JOHN , VAN DRIEST HANS , KAMERMAN ADRIAAN
Abstract: A receiver and a method for operating the receiver, for a station in a wireless local area network using a common wireless communication channel and employi ng a CSMA/CA (carrier sense multiple access with collision avoidance) protocol includes various modes. In normal mode, the receiver follows typical states in order to detect a message and demodulate data from the message properly. Meanwhile, a proce ss implements a message-in-message (MIM) mode when an energy increase above a specified level is detected. While in the MIM mode, if a carrier is detected , the energy increase is caused by a new message; otherwise, the energy increase is cause d by an interfering station. If the carrier is detected, the receiver begins retraining so that it can start receiving the new message as soon as the first message ends. If no carrier is detected, the receiver waits a specified time to detect a carrier or for the end of the first message, after which the receiver returns to the beginning of the normal mod e. While in the normal mode, if a message is detected that is not addressed to the station, the receiver enters a hunt mode. While in the hunt mode, the receiver waits for the curre nt message to finish. At the same time, a process implements retraining when both an energ y increase above a specified leveland a carrier are detected. If no carrier is detected within a specified time, or if the energy level decreases below the specified level, the receiver returns to the beginning of the normal mode.
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公开(公告)号：CA2206581A1
公开(公告)日：1998-01-30
申请号：CA2206581
申请日：1997-05-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KAMERMAN ADRIAAN , AWATER GEERT ARNOUT , VAN NEE RICHARD D J , KRISHNAKUMAR ANJUR SUNDARESAN
Abstract: The encoding/transmission of information in an OFDM system is enhanced by using complementary codes. The complementary codes, more particularly, are converted into phase vectors and the resulting phase vectors are then used to modulate respective carrier signals. The modulated result is then transmitted to a receiver which decodes the received signals to recover the encoded information.
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公开(公告)号：DE69837697T2
公开(公告)日：2008-01-10
申请号：DE69837697
申请日：1998-09-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KAMERMAN ADRIAAN , MUD RIENK , MONTEBAN LEO
IPC: H04L12/28 , H04B7/005 , H04L12/413 , H04W52/18 , H04W74/08
Abstract: A method of operating a wireless local area network station (40) adapted to transmit and receive a signal within a communication cell (30) includes the steps of establishing a carrier detect threshold level (32-2), establishing a defer threshold level (38), and transmitting a signal when the signal level detected by the network station (40) is above the defer threshold level (38). Additionally, the method includes the step of receiving a signal transmission intended for the network station (40) when the power of the received signal transmission is above the carrier detect thr eshold level (32-2).
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公开(公告)号：DE60026454T2
公开(公告)日：2006-11-09
申请号：DE60026454
申请日：2000-05-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： AWATER GEERT ARNOUT , KAMERMAN ADRIAAN , MOELARD HENDRIK
Abstract: A communication system with a plurality of access points (AP1, AP2, AP3) and at least one network station (5, 6), the network station (5, 6) being arranged to communicate with one of said plurality of access points (AP1, AP2, AP3) through a wireless communication protocol, each access point (AP1, AP2, AP3) is able to: monitor its access point traffic load and transmit an access point traffic load parameter (ATT) to the network station (5, 6), and the network station (5, 6) is able to: monitor its network station traffic load; store a network station traffic load parameter (AUTT); receive access point traffic load parameters (ATT) from the access points (AP1, AP2, AP3); select a communication connection with one of the access points (AP1, AP2, AP3) using a predetermined cost function taking the access point traffic load parameters (ATT) and the network station traffic load parameters (AUTT) into account.
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