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7627348 |
Point to multipoint device for communication with a plurality of telecommunications units
A point to multipoint device for use in a wireless network operates a sequence of variable duration communication channels, allocatable to telecommunications units. A training sequence indication...
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7508812 |
Socket management for always-on data connections
A method of automatically keeping sockets open for always-on applications in a GPRS context is provided. Information is maintained by each wireless device identifying each APN (access point...
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7502338 |
De-emphasis training on a point-to-point connection
A method for establishing data transmission between a two devices by performing de-emphasis training is disclosed. While a retry count does not exceed a predetermined threshold: a training pattern...
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7496688 |
Label switched data unit content evaluation
Evaluation of label switched data units is disclosed. In a method, a data unit is received or obtained, and, when the data unit is a label switched data unit, a kind of an encapsulated data unit...
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7492813 |
Startup protocol for high throughput communications systems
A startup protocol is provided for use in a communications system having a communications line with a master transceiver at a first end and a slave transceiver at a second end, each transceiver...
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7440417 |
Method and system for frame and protocol classification
A system and method of protocol and frame classification in a system for data processing is disclosed, including, analyzing a portion of the, packet or frame according to predetermined tests, and...
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7369516 |
Adaptive echo canceling
A method for transmitting data signals in full duplex with echo cancellation between a first and a second modem connected by a two-wire channel, wherein a data signal is a function of at least one...
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7366475 |
Signal strength measurements in cellular telecommunication systems
A mobile station (MS) and method for estimating received signal strength of a radio signal from a neighboring cell in a cellular radio telecommunication network. The MS measures the received signal...
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7349482 |
Echo canceller of ADSL system and training method thereof
An echo cancellation circuit includes delay units at its input unit and output unit in order to adjust the delay caused by a FIFO. The delay times of the delay units are trained using a training...
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7299067 |
Methods and systems for managing the provision of training provided remotely through electronic data networks to users of remote electronic devices
Methods and systems for providing and managing training through/over networks to remote multimedia device users are disclosed. Training can be provided through networks to computers and portable...
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7239660 |
Adaptive filter with GSPT LMS algorithm for reducing complexity
A linear/non-linear adaptive filter for transforming an input signal to an output signal. The present invention also includes a novel GSPT LMS algorithm for significantly reducing complexity. The...
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7133442 |
Rapid identification of transmission media channel characteristics
Rapid identification and modeling of transmission media channel characteristics of a communications system using a correlation based technique. The technique provides a known training sequence used...
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7133906 |
System and method for remotely configuring testing laboratories
The invention provides a system for remotely configuring a plurality of devices to customize a lab network system for testing components and for training operators to use and maintain such systems....
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7058730 |
Unique address space and method for a transport network
A method and system for routing an externally generated message in a network includes receiving at an ingress port of a network a message from an external network. The message includes Internet...
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7023812 |
System and method for improving modem transmission through private branch exchanges, central offices, and other systems
A modem including an echo canceller adapted to determine locations of far-end echo sources. The echo canceller is adapted to send a signal to turn off network echo suppressors and enter a training...
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7020068 |
Echo and crosstalk cancellation
A cancellation system comprises a channel circuit ( 11 ) for each noise source, such as echo in a particular cable pair. There are only eighty taps per channel, in two blocks (n_echo_a, f_echo_a)....
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7002897 |
Multiple channel interference cancellation
A method and apparatus for reducing crosstalk in a multi-channel communication system is disclosed. In one embodiment, outgoing signals in a multi-channel environment are manipulated into a...
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6987752 |
Method and apparatus for frequency offset estimation and interleaver synchronization using periodic signature sequences
A method and apparatus are disclosed for frequency offset estimation and interleaver synchronization, using periodic signature sequences, such as Barker codes. The periodic signature sequence is...
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6987782 |
Method and apparatus for detecting robbed bit location in PCM modems and the like
A method and apparatus for detecting the location of robbed bits by a digital communications network. A complete echo cancellation circuit also is disclosed employing the robbed bit detection...
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6931054 |
Method for estimating channel parameters of radio channels of a W-CDMA mobile radio system
A method for estimating channel parameters of radio channels of a W-CDMA mobile radio system, for example in accordance with the UMTS standard includes transmitting sequences of known symbols...
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6928110 |
Adaptive equalizer training circuit, modem apparatus and communication apparatus
A training circuit for training a tap coefficient of an adaptive equalizer that performs error calculations in a training process and updating of the tap coefficient in a time area and thereby...
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6920115 |
Time-division multiplex radio communication method, transmitter and receiver for implementing such method
A transmitter produces radio signal bursts in periodic time slots allocated to a time-division multiplexed channel. The radio signal of each burst is made up of digital symbols comprising two...
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6920219 |
Method and apparatus for providing echo cancellation
A method for providing echo cancellation between a first and second communication unit detects an echo condition ( 200 ) between first and second communication units. In addition, the method...
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6771591 |
Method and system for processing orthogonal frequency division multiplexed signals
An Orthogonal Frequency Division Multiplexing (OFDM) receiver that compensates for FFT window drift by extracting a training symbol from a fast Fourier transformed OFDM signal, and processing the...
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6760368 |
Fast retraining method, apparatus, and storage medium in an xDSL transceiver
The process in an xDSL transceiver transfers into a fast retraining sequence when the cause of an error on a telephone circuit is a change from an off hook state to an on hook state of a telephone...
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6725066 |
Method of cancelling echoes in a telecommunications system and an echo canceller for the execution of the method
A method of canceling echoes in a telecommunications system wherein an exchange of information takes place between a local subscriber and a subscriber at the remote end of a transmission link and...
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6693957 |
Adaptive front end for discrete multitone modem
An adaptive DMT modem determines, as part of a startup sequence, subscriber loop conditions. One or more loop condition adaptation operations are then performed to reduce the complexity of the...
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6650627 |
Tone detection in communication networks
A communication circuitry for providing effective detection of tones in a communication network. The communication circuitry comprises filtration circuitry, summation circuitry, detection...
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6650617 |
Reduced complexity FFT window synchronization for an orthogonal frequency division multiplexing system
An Orthogonal Frequency Division Multiplexing (OFDM) receiver that compensates for FFT window drift by extracting pilots from a fast Fourier transformed and equalized OFDM signal, and processing...
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6628704 |
Equalizer training for ADSL transceivers under TCM-ISDN crosstalk environment
A technique for training an equalizer of an ADSL Annex C transceiver is provided. The technique defines the points in the transmission sequence at which equalizer training should take place, and...
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6590976 |
Two-step algorithm for training an echo cancellation filter
A two-step training method for the estimation filter in the echo cancellation (EC) path of the analog front-end (AFE) circuit for a modem, such as an asymmetric digital subscriber line (ADSL)...
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6560321 |
Method and apparatus for quick startup in a half-duplex modem system
A half-duplex facsimile modem system according to the present invention may exhibit a shorter startup time relative to conventional systems. The modem system exchanges capabilities information...
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6535552 |
Fast training of equalizers in discrete multi-tone (DMT) systems
A method for fast training of equalizers in a DMT system begins by normalizing the incoming receive signal ( ν ) via steps ( 108-116 ). By normalizing the signal, the convergence rate of the...
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6484209 |
Efficient path based forwarding and multicast forwarding
A method and apparatus for efficiently switching cells through a switch fabric are provided. According to one aspect of the present invention, logic for forwarding and filtering multicast data is...
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6421326 |
Wireless communications system and method
A system and method enable wireless communication from one data processing system to a telephone network. The system and method establish a connection from a local transceiver to a base transceiver...
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6370124 |
Technique for treating channel impairments including a digital loss in transmitted signals in data communications
In a communications arrangement, a first pulse code modulation (PCM) modem communicates data in the form of PCM words with a second PCM modem through a public switched telephone network (PSTN). The...
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RE37569 |
High-speed modem synchronized to a remote codec
A modem that operates reliably at a symbol rate that corresponds to twice its bandwidth even when it is coupled to a receiving A/D converter that operates under control of a clock is realized by...
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6347223 |
Method and receiver for data transmission
A method and a device are specified for data transmission via an air interface between radio stations in a radio communications system. Data to be transmitted are grouped into message blocks at the...
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6317419 |
Method and apparatus for training an echo canceler in a PCM modem context
An improved echo canceler training technique may be employed by a digital server modem in a PCM modem context, such as a V.90 modem system. The disclosed echo canceler training technique...
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6307883 |
Apparatus, method and system for wireless communication
The subject invention improves tracking performance of an adaptive equalizing operation while reducing the calculation volume. A frame including a training sequence and a mixed data sequence in...
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6147979 |
System and method for echo cancellation in a communication system
A system and method for echo cancellation in a communication system having a digital echo canceller and an analog echo canceller for analog reduction of cross coupling echo components in an analog...
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6094461 |
Data transmission
A transmitter (20) having means (206, 207) to encode an input signal to form coded data, each element of said coded data having one of at least two discrete signal magnitude levels, the encoding...
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6094422 |
Echo canceller touch-up period in an echo-cancelling modem
Abbreviated subsystem retraining in a local modem including an information processor having a plurality of subsystems configurable with the information processor for data communications over a...
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6084862 |
Time dispersion measurement in radio communications systems
Time dispersion of a signal that has been received from a channel is measured by utilizing metrics to determine the energy inside an equalizer window and outside of the equalizer window. In one...
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6072782 |
Efficient echo cancellation for DMT MDSL
An echo cancellation scheme for DMT MDSL digital subscriber loop telecommunications data transfer is disclosed. The echoed data stream frame is aligned with the incoming data stream frame. The time...
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6064733 |
Echo canceller apparatus
An echo canceller apparatus consists of a frame aligner circuit and an echo canceller. The frame aligner circuit forcibly generates a data slip of a receive input signal by a recursive buffer of a...
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6002716 |
Equalizer with extended channel estimation for a receiver in a digital transmission system
A digital transmission system comprising a receiver, the receiver including a receiver input stage and a digital memory for storing a sequence of binary symbols of sample values, formed in the...
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5917856 |
Method for establishing a PAM signal connection using a training sequence
In a method for establishing a data communication connection in a data channel utilizing PAM signals, a transmitter transmits a training sequence, formed of predetermined symbols, a predetermined...
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5909426 |
Orthogonal LMS algorithms for fast line echo canceler training
An echo canceler for calculating an echo impulse response during a training sequence, wherein a sequence of data samples is selected such that a full rank data correlation matrix comprised of such...
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5892757 |
Asymmetric duplex modem utilizing narrow band echo cancellation
A full-duplex modem having improved transmission speeds over voice grade telephone circuits that extends the concepts of asymmetric transmission to include echo cancellation techniques. The...
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