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7634023 |
Orthogonal frequency digital multiplexing correlation canceller
A correlation canceller modulates a communication signal over a plurality of channels and an epoch aperture by a plurality of interference response signals corresponding to linear response by one...
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7593473 |
Tree structured multicarrier multiple access systems
A Tree-structured multicarrier multiple access communication system in a multiple access environment having a number of interfering signals. In one embodiment an environment estimator estimates and...
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7558327 |
Pattern position measuring device, method, and program, and record medium on which the program is recorded
The position of a specific pattern such as a known symbol in a signal such as an OFDM signal is estimated with high accuracy. An effective symbol extraction section extracts a known symbol...
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7450489 |
Multiple-antenna communication systems and methods for communicating in wireless local area networks that include single-antenna communication devices
In a wireless local area network (WLAN) that includes high-throughput communication devices with multiple antennas and legacy communication devices with single antennas, training tones are...
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7426242 |
Orthogonal frequency digital multiplexing correlation canceller
A correlation canceller modulates a communication signal over a plurality of channels and an epoch aperture by a plurality of interference response signals corresponding to linear response by one...
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7400651 |
Device and method for interpolating frequency components of signal
A frequency interpolation apparatus is provided which reproduces a signal similar to an original signal by approximately recovering suppressed frequency components, from an input signal having the...
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7327765 |
Home phone line networking next generation enhancements
New version devices of a home phone line network may operate on a first carrier frequency (within the new version frequency band) while old version devices may operate at a second carrier frequency...
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7269127 |
Preamble structures for single-input, single-output (SISO) and multi-input, multi-output (MIMO) communication systems
A communication system is provided herein for transmitting frames across a channel. The frames may be transmitted in single-input, single-output (SISO) and/or multi-input, multi-output (MIMO)...
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7230993 |
Method and apparatus for modulation using an at least four-dimensional signal constellation
A digital communication system ( 20 ) in which a signal constellation ( 30 ) of a dimensionality of at least four is used, with distance properties chosen to reduce the bit error rate compared to...
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7187734 |
Method of slip compensation for integer frequency offset correction in a wireless communication system
A method of correctly estimating the frequency offset when the CPE modem has already acquired and is tracking the OFDM burst boundaries in an OFDM-based, wireless communication system. CPS data in...
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7035288 |
Modulation of a pilot carrier, and means to perform this modulation
For synchronisation purposes, a transmitter (TX) multiplexes a pilot carrier with carriers whereon data elements (DATA) are modulated, and transmits the pilot carrier together with the modulated...
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7031250 |
Method and apparatus for channel estimation
Various methods and systems efficiently implement broadband multi-carrier communication systems. The invention exploits the structural properties of a frequency-domain channel estimator and...
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7016298 |
Signal transmission/reception system of orthogonal frequency division multiplexing
A transmission apparatus of orthogonal frequency division multiplexing for multiplexing a plurality of carriers orthogonal to one another to transmit a modulated signal. The transmission apparatus...
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7012505 |
Method and system for communication on a power distribution line
A method and system of communicating on an active power distribution line using numerous asynchronous data transmitters. Data is modulated onto 5 KHz carrier signals of narrow bandwidth whose...
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6993317 |
Method and system for signal repeating in powerline communications
A method and system for enhancing communication signals in a power-line communications system, which uses high-voltage or medium-voltage power lines as a transmission medium. Because communication...
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6989734 |
Modulated data transfer between a system and its power supply
A power supply that includes networking capabilities where networking data is sent and received to and from other systems over the power line and to and from the rest of the system that is being...
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6950567 |
Method and apparatus for providing inductive coupling and decoupling of high-frequency, high-bandwidth data signals directly on and off of a high voltage power line
The present invention is drawn to an electrically “closed” method and apparatus for transmitting and receiving data signals over a high voltage power line. Inductive coupling is employed for...
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6937558 |
Transmitter apparatus and receiver apparatus and base station making use of orthogonal frequency division multiplexing and spectrum spreading
An improved transmitter apparatus, a receiver apparatus and a base station implemented with the transmitter and receiver apparatuses are described. These apparatuses and the base station serves to...
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6912233 |
Modulation/demodulation of a pilot carrier, and means to perform the modulation/demodulation
For synchronization purposes, a transmitter (TX) multiplexes a pilot carrier with carriers whereon data elements (DATA) are modulated, and transmits the pilot carrier together with the modulated...
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6876672 |
Method of transmitting data on multiple carriers from a transmitter to a receiver and receiver designed to implement the said method
A method of transmitting data on multiple carriers is disclosed, the method consisting, on a transmitter side, of binary to signal coding of the data to be transmitted so as to form modulation...
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6853632 |
Technique for peak power to average power ratio reduction in multicarrier communication systems
A gradient sensitivity based method is described for reducing Peak to Average Power Ratio in multicarrier communication systems. The method involves definition of a differentiable penalty function...
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6757299 |
Peak power to average power ratio reduction in multicarrier communication systems using error-correcting code
This invention pertains to multicarrier systems where the Peak power to Average power Ratio (PAR) is generally high, and where the system has a Forward Error Correction (FEC) mechanism. A peak...
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6741604 |
ADSL transmission in the presence of low-frequency network services
A method for providing Digital Subscriber Line (DSL) service to a group of subscribers over respective subscriber loops in the presence of another, existing digital network service provided on at...
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6594320 |
Orthogonal Frequency Division Multiplexed (OFDM) carrier acquisition method
In all wireless systems, the first operation that must take place at the receiver is the acquisition of the carrier and timing. OFDM systems are particularly sensitive to carrier offsets since...
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6549120 |
Device for sending and receiving data through power distribution transformers
A powerline communication system including a transmitter having a pair of terminals for connection to the power lines. The transmitter comprises a carrier frequency generator for generating a...
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6510133 |
Multi-carrier transmission method and data transmitter
Equipped with a plurality of mapping blocks 102 and 103 that carry out mappings of different rates, signals subjected to low-speed mapping are placed in the periphery of a band to which a...
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6501791 |
Method and apparatus for allocating tones to a plurality of users in a multi-tone modem communications system
A communications system includes a first and second modem coupled together via a communications link. The first modem has at least two user devices coupled thereto, and modulates data generated by...
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6487252 |
Wireless communication system and method for synchronization
An orthogonal frequency division multiplexed wideband communication system provides improved time and frequency synchronization by inserting an unevenly spaced pilot sequence within the...
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6437686 |
System for monitoring airport equipments utilizing power-line carrier
A power-line carrier airport facilities monitor system, comprising a host station and respective terminal for monitoring individually the object facilities via a rubber transformer are connected in...
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6424661 |
ADSL with RF POTS overlay
A bidirectional telephony (POTS or ISDN) system utilizes RF technology to move the signalling away from the baseband frequency. The method translates baseband telephony signalling into one or more...
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6396803 |
Modulation methods and structures for wireless communication systems and transceivers
Wireless communication methods and structures are provided that enhance communication robustness while reducing cost. They communicate downstream data with orthogonal frequency division...
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6370157 |
Automatic frequency control for a cellular base station
A method for automatic frequency control in a wireless communication network having public frequency channels comprises the steps of: scanning the public frequency channels; locking the cellular...
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6359868 |
Method and apparatus for transmitting and receiving data multiplexed onto multiple code channels, frequencies and base stations
In the present invention, high speed data is provided by transmitting data on multiple carrier frequencies, multiple code channels and/or from multiple base stations. In a first embodiment of the...
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6269105 |
Use of features to represent independent bit streams or groups of bits in data transmission systems
A method and apparatus for simultaneously communicating a first data stream along with a second data stream. A first carrier is modulated with a first data stream and a feature of the modulated...
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6249213 |
Method for transmitting information over an alternating current power line through a plurality of frequency orthogonal subchannels
One embodiment of the present invention is a method for transmitting information over an AC power line. A frequency channel for transmitting the information is selected and divided into a plurality...
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6195537 |
Method and apparatus for strong signal suppression in multi-carrier signals
A block radio design is disclosed that prevents the primary analog-to-digital converter from saturating and thus prevents the introduction of intermodulation products into the multi-carrier signal....
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6194996 |
Information transfer via power line carrier
A signal superposing apparatus designed, in accordance with a basic power line model taking account of the term of the mutual inductance and that of a self inductance of a transformer connected to...
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6178175 |
Circuit array and method for creating a data feedback channel from receiver to transmitter in a common frequency network
The establishment of an interactive broadcasting network requires not only a transmission channel from transmitter to receiver but also a transmission channel from receiver to transmitter. A novel...
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6005477 |
Method and apparatus for information transmission via power supply lines
A method and a system for rapid and interference-free data communication via power supply networks at any voltage levels. The combined effects of interference from signal distortion,...
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5844949 |
Power line communication system
A system for communicating digital information over wires having a great deal of harmonic distortion, such as a power line, employs a transmitter which transmitter which creates a carrier wave for...
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5809030 |
Frequency division multiple access (FDMA) dedicated transmission system, transmitter and receiver used in such a transmission system
The demodulation of data modulated on a set of carriers with equidistant frequencies by a plurality of transmitters (T1 . . . Tn) is executed in the present transmission system (TS) by a discrete...
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5771224 |
Orthogonal frequency division multiplexing transmission system and transmitter and receiver therefor
A transmission system is disclosed which permits the receiving end to demodulate multi-valued modulated symbols successfully under fading conditions and reduces the amount of transmitted reference...
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5581229 |
Communication system for a power distribution line
The invention provides a layered modulation data communication systems characterized by numerous, asynchronous data transmitters operating on a power line. Data is modulated onto relatively low...
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5559809 |
Transmit block up-converter for very small aperture terminal remote station
A transmit block up-converter is provided for processing a multiplexed signal including a transmit IF signal, a reference frequency signal, a switching signal, a level signal and a constant-current...
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5557617 |
Frequency division switching using RF buss
A system and method for isolating a data or circuit signal, where the circuit signal has been frequency spread modulated with other such signals onto a beam signal and which beam signal has been...
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5504783 |
Frequency diversity transmitter and receiver
A frequency diversity communication system is provided whereby the number of hopping channels is reduced and a more continuous communication achieved as a mobile station travels from cell to cell...
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5406551 |
Method and apparatus for digital signal transmission using orthogonal frequency division multiplexing
A digital signal transmission using OFDM modulation scheme in which the valid transmission data can be reproduced without requiring a recovery of the carriers at a receiver side. On a transmitter...
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5375144 |
Broad-band mobile radio link for high-volume transmission in an environment with multiple reflections
Digital radio link capable to solve the problem of high-volume data transmission in environments with multiple reflections, such as urban areas, inside buildings, etc. The said radio link can be...
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5357502 |
Device for the reception of digital data time frequency interlacing, notably for radio broadcasting at high bit rate towards mobile receivers with nyquist temporal window
A device for the reception of digital data broadcast at a high bit rate for reception by mobile receivers is disclosed. The device operates under adverse conditions of multiple propagation...
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5301052 |
Communication method and network using optical fibers with frequency multiplexing
The emission frequencies (F(1) . . . F(2P)) used for simultaneous communications form a stack extending from a fixed based frequency (F(0)) to a top of stack frequency (F(2P-1), F(2-P)). At the...
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