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7634016 |
Variable OFDM subchannel coding and modulation
A system for selecting a modulation scheme and an error correction coding scheme for each subchannel in an OFDM system based on the energy detected on that subchannel.
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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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7633994 |
System and method for distributed input-distributed output wireless communications
A system for compensating for in-phase and quadrature (I/Q) imbalances for multiple antenna systems (MAS) with multi-user (MU) transmissions (defined with the acronym MU-MAS), such as...
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7630452 |
Method and apparatus for an ultra-wideband radio utilizing MEMS filtering
A method and apparatus for a UWB radio utilizing MEMS filtering is described. The method described includes receiving a pulse signal from a transmission station. Once received, a delay line...
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7627054 |
Device and method for improving the signal to noise ratio by means of complementary sequences
A device and method for improving the signal to noise ratio by means of complementary sequences, consisting of the use of M complementary sets of sequences, understanding complementary as the sums...
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7626919 |
OFDM signal collision position detection apparatus and OFDM reception device
A pilot reception power measuring section 104 measures reception power of a pilot symbol and a data section reception power prediction section 106 predicts reception power of data symbols based...
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7627043 |
Method and apparatus for transmitting data with reduced coupling noise
A first integrated circuit is coupled to a first connector. A second connector is coupled to the first connector through multiple conductors, in which alternating pairs of conductors are reversed....
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7623604 |
Suppressing interference for wireless reception and improvements relating to processing a frequency shift keyed signal
A communications receiver may include an adaptive filter unit for removing coherent interference components from a received signal. In the absence of a signal of interest, the filter may adapt...
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7616711 |
Frequency domain filtering to improve channel estimation in multicarrier systems
A channel estimation system comprises a filtering component that selectively scales a plurality of carriers as a function of location of the plurality of carriers within a frequency band, wherein...
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7613249 |
Spurious component reduction
Apparatus, systems, and methods implementing techniques for reducing spurious components are described. According to one aspect, a wideband polyphase filter filters an input signal that has an...
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7609772 |
Apparatus and method for optimally compensating for imbalance between in-phase and quadrature-phase in a zero-IF OFDM receiver
An optimum I/Q imbalance compensating apparatus and method in a zero-IF OFDM receiver. In the apparatus, a first compensator generates a first symbol by removing interference from a second...
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7606321 |
System and method for simplifying analog processing in a transmitter incorporating a randomization circuit
The system and method enable simpler analog processing in a transmitter by reducing the number of bits in a digital signal through delta sigma modulation. Selection of current sources in a digital...
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7606317 |
Channel optimization system
A channel optimization system for use with a communications channel and method of separating and encoding signals associated with the communications channel. In one embodiment, the channel...
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7602866 |
Signal receiver devices and methods
A method/apparatus is provided that detects impairment in a received signal and employs the structure in the receiver that is designed for that purpose. Preferably, the method/apparatus detects the...
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7599445 |
Device for transmitting digital signals between mobile units with modification of the spectral characteristics
A device for transmission of digital signals between two units movable relative to each other, particularly with non-contacting rotating data transmission devices, comprises an encoder on a...
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7599420 |
System and method for distributed input distributed output wireless communications
A system and method are described for compensating for frequency and phase offsets in a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”). For example, a method...
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7596183 |
Joint optimization of transmitter and receiver pulse-shaping filters
A method for jointly designing a transmitter pulse-shaping filter and a receiver pulse-shaping filter having respective filter coefficients includes defining one or more performance-related...
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7593693 |
Adaptive antenna array with programmable sensitivity
Methods and apparatus for calculating spatial processing strategies in adaptive antenna array processing systems. Reference signal quality, intersymbol interference, data processed and received...
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7590176 |
Partial response transmission system and equalizing circuit thereof
A partial response transmission system in which a data signal is transmitted from a transmission side to a reception side through a transmission medium, includes an equalizing circuit provided in...
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7586995 |
Peak windowing for crest factor reduction
In order to reduce the crest factor of a signal for power amplification, a windowing function is applied. The windowing function that is applied is a triangular windowing function. The use of this...
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7580471 |
Nonlinear device detection
Data is collected and interpreted in response to one or more transmitted signals to determine if an interfering device is present. If an interfering device is present, a message is generated and...
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7577085 |
Multicarrier transmit diversity
Method, apparatus, and data packet format to implement transmit diversity in a multicarrier environment is disclosed. For diversity transmission operations, space frequency encoding techniques are...
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7573959 |
Method and apparatus for removing impulse noise
An impulse noise remover includes: a storage module for storing a plurality of digital values derived from a received signal; a calculating module coupled to the storage module for calculating a...
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7570701 |
Multi-pair gigabit ethernet transceiver
Various systems and methods providing high speed decoding, enhanced power reduction and clock domain partitioning for a multi-pair gigabit Ethernet transceiver are disclosed. ISI compensation is...
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7564912 |
Method and apparatus for channel state information generation in a DVB-T receiver
A method and apparatus for channel state information generation in a DVB receiver. The present invention comprises: obtaining the magnitude of an error signal and a channel response signal of a...
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7558348 |
Radio frequency antenna system and high-speed digital data link to reduce electromagnetic interference for wireless communications
A radio frequency antenna system and high-speed digital data link are disclosed to, among other things, reduce electromagnetic interference (“EMI”) at relatively high data rates while reducing...
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7555079 |
Method and corresponding arrangement for DC offset compensation using channel estimation
A method of determining a DC offset in a communications signal received via a communications channel, the communications signal comprising a sequence of training symbols. The method comprises...
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7555075 |
Adjustable noise suppression system
Methods and corresponding systems for suppressing noise in an input signal include setting a minimum overall gain in a noise reduction processor for processing a first frame of data associated with...
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7555055 |
Digital subscriber line communicating system
A digital subscriber line communicating system having a central office and a remote terminal connected through a telephone line, the transmitting side comprising a sliding window transmitting unit...
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7551687 |
Distortion compensating apparatus
A distortion compensating apparatus for correcting the size of a distortion compensation coefficient in such a manner that a transmit signal that has undergone distortion compensation will not...
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7551681 |
Digital wireless audio transmitter system employing time diversity
A transmitter system that transfers digital data on a fixed frequency channel of a radio frequency band in the presence of interference from at least one FHSS interference source includes a time...
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7551736 |
Physical layer header scrambling in satellite broadcast systems
Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises scrambling a first header of the...
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7548587 |
Methods and apparatus for use in reducing residual phase error in OFDM communication signals
Methods and apparatus for use in reducing residual phase error (RPE) in orthogonal frequency division multiplexed (OFDM) communication signals are described. One method includes the steps of...
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7545878 |
Efficient circular clipping implementation using simplified CORDIC rotators
A system for the efficient use of CORDIC rotators is provided. The system includes at least one first rotator operating in vector mode and includes a sign storage buffer. The system also includes...
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7545893 |
Single antenna interference cancellation via complement subspace projection in spatial-temporal expansion of noise estimation
Interference rejection in a wireless communication system involves determining a complement spatial-temporal signal subspace that is complement to a spatial-temporal signal subspace of an...
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7542514 |
Method and device for adaptive modulation and coding based on second order statistics of channel information
The present invention discloses a method and device for adaptive modulation and coding based on second order statistics of channel information in OFDM system, characterized in that, by means of...
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7535974 |
Method and apparatus for amplifier linearization using adaptive predistortion
A system configured to linearize a response of a nonlinear amplifier comprises a buffer to store a plurality of samples of an input signal to be amplified by the nonlinear amplifier. A...
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7532675 |
Techniques to time vary pilot locations in wireless networks
An embodiment of the present invention provides an apparatus, comprising a receiver capable of selecting optimal pilot locations and providing feedback of the pilot locations to a transmitter in...
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7529307 |
Interleaver
An interleaver and scheme for interleaving in which highly correlated bits are maximally separated. The scheme involves interleaving a set of bits to be delivered to a modulation system that...
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7529176 |
Method and apparatus for determining a transmit PSD at a remote location
The present invention relates to a method for determining a transmit PSD over a remotely-deployed line, which method comprising the steps of:
modeling a first far-end crosstalk originating...
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7526043 |
High speed line equalizer and method thereof
The present invention relates to a high speed line equalizer and a method thereof. The high speed line equalizer receives and amplifies one clock signal and at least more than one data signal. The...
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7526041 |
Channel estimation circuit and channel estimation method
A channel estimation circuit of the present invention includes: a tentative channel estimation unit for performing channel estimation by making use of a received signal and outputting the result of...
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7526042 |
OFDM system receiver apparatus suppressing inter-symbol interference
An OFDM receiver includes an inter-symbol interference suppressing unit to modify to a predetermined content a portion of a dominant wave included in a received signal and a predetermined content a...
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7519129 |
Precoding of contention words in a fixed wireless access system
A fixed wireless access communications system comprises an access point and a plurality of subscriber units. Each subscriber unit ( 502 ) contends for access to a communications channel to the...
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7515646 |
Method and apparatus for reducing EMI emissions for data signals traveling over a data pathway
An improved data signal electromagnetic emissions system is provided for sending data signals over one or more data pathways. An original data signal is encoded into a set of sideband frequencies...
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7515661 |
Transmission device, transmission method, reception device, reception method, transmission/reception device, communication method, recording medium, and program
A transmitting apparatus, a transmitting method, a receiving apparatus, a receiving method, a transceiver, a communication apparatus and method, a recording medium, and a program in which high...
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7515672 |
Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with programmable current limiting
A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines....
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7505506 |
System and method for generating single sideband, constant envelope, spread spectrum signals with multiple spreading codes
A method of generating a composite signal includes the steps of: (a) generating a plurality of sub-carriers, each sub-carrier having a different frequency position in a frequency spectrum; (b)...
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7505538 |
Ultra wideband communication system, method and device with low noise reception
An ultra-wide band (UWB) waveform receiver with noise cancellation for use in a UWB digital communication system. The UWB receiver uses a two-stage mixing approach to cancel noise and bias in the...
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7505528 |
Method and apparatus for range extension of low-power wireless communication links
A method and system for improving a level of service between wireless devices. Handheld devices implementing the Bluetooth specification typically have relatively limited transmission ranges. As a...
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