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7424273 |
Evaluating performance of a multiple-input multiple output (MIMO) communications link
A method is provided of evaluating the frame error probability (FER) of a selected communications link in a telecommunications network. The link is that between a MIMO transmitter comprising one of...
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7424062 |
Efficient doppler compensation method and receiver for orthogonal-frequency-division-multiplexing (OFDM) systems
A receiver and method of enhancing transmitted data signals in a wireless communications system includes wirelessly transmitting and receiving a data signal over a wireless channel in the...
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7424277 |
Device, system and method of wireless signal detection
Some embodiments of the invention provide devices, systems and methods of wireless signal detection. For example, an apparatus in accordance with an embodiment of the invention includes a detector...
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7423959 |
Process for synchronization in the downstream of multiple users in a point multipoint system with OFDM modulation
The system in this invention is applicable to bi-directional communication over the electricity network between a head-end and a plurality of users, and permits the synchronization in time and...
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7421029 |
Impulse response shortening and symbol synchronization in OFDM communication systems
A method for receiving at a receiver having a variable filter a transmitted signal that includes a periodic training signal. The method includes (a) receiving and sampling the transmitted signal at...
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7421031 |
Method for initializing the computation of a quasi-periodic steady state of a multi-tone system
The invention refers to a method for initializing the computation of a quasi-periodic steady state of a multi-tone system, and to a computer program product for carrying out such a method. The...
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7421015 |
Bit-loading in multicarrier communication systems in the presence of an asymmetric, correlated gaussian noise sources
In general, various methods and apparatus are described that use a multi-tone receiver. The multi-tone receiver detects data in a multiple tone signal. The receiver has a detector module to measure...
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7421030 |
Method and device for transferring data in a multi-carrier system having parallel concatenated encoding and modulation
The invention relates to a transmitter-receiver pair for improved data transmission in a multi-carrier system and to a corresponding method, according to which a chain coding is used. To this end,...
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7418048 |
Tone ordered discrete multitone interleaver
A tone ordered discrete multitone interleaver system and method, including a tone ordered interleaver and deinterleaver, are provided for efficiently communicating data despite noise affecting a...
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7418039 |
Adaptive communication
The invention provides a system for analysing a signal received over a channel to determine the channel characteristics. The determined characteristics are then used to divide the sub-carriers up...
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7418040 |
Method and apparatus for determining a timing offset for processing a multi-carrier signal
A receiver 200 as a component in a wireless communication device 100 and a corresponding method are used for receiving a multi-carrier communication signal and determining a timing offset...
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7418043 |
Software adaptable high performance multicarrier transmission protocol
Techniques for reducing peak-to-average power in multicarrier transmitters employ peak cancellation with subcarriers that are impaired by existing channel conditions. The use of Carrier...
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7418041 |
Transmitting/receiving apparatus and method for reducing PAPR in an OFDM mobile communication system
A block coding apparatus and method in an OFDM mobile communication system are provided. They reduce PAPR to 3 dB or less, while increasing a traditional block coding rate by twice, by use of...
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7418065 |
Multicarrier receivers and methods for detecting cyclic prefixes having unknown lengths
A multicarrier receiver sequentially correlates two training symbols to determine a length of a cyclic prefix associated with each of the training symbols.
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7418049 |
Method and apparatus for decoding baseband orthogonal frequency division multiplex signals
A method and apparatus for decoding baseband OFDM signals include processing that begins by slicing each sub-carrier signal of the OFDM signal into a plurality of error terms. The particular number...
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7418046 |
Pilot transmission and channel estimation for multiple transmitters
Each transmitter is assigned a time-only pilot code, a frequency-only pilot code, or a time-frequency pilot code to use for pilot transmission. The pilot codes may be pseudo-random, orthogonal,...
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7418649 |
Efficient implementation of reed-solomon erasure resilient codes in high-rate applications
A high-rate Reed-Solomon erasure resilient codes (ERC) system and method for generating and implementing Reed-Solomon erasure-resilient codes for use in high-rate applications. High-rate...
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7418045 |
Method for updating singular value decomposition of a transfer matrix
A method is disclosed for adaptively updating full or partial singular value decomposition (SVD) of a transfer matrix. The method employs orthogonal projections of known output and input vectors...
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7418246 |
Physical layer unit for transmitting or receiving various signals, wireless LAN system including the same, and wireless LAN method using the wireless LAN system
A physical layer unit (PLU) for receiving (and transmitting) various signals, a wireless Local Area Network (LAN) system including the PLU, and a wireless LAN method using the wireless LAN system....
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7418042 |
Repetition coding for a wireless system
Data is transmitted over a wireless channel. Convolutionally encoded data is received and the data is repetition encoding where a repetition rate associated with the repetition encoding is set to...
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7418047 |
Communication apparatus using a plurality of modulation schemes and transmission apparatus composing such communication apparatus
A first signal generation section 11 generates a baseband modulation signal for an ASK modulation scheme from transmission data. A second signal generation section 12 generates a pair of...
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7418044 |
Radio communication system, radio communication method, radio base station, and radio terminal station
There is disclosed a multicast transmission system in which an efficient and highly reliable multicast transmission can be performed. In the multicast transmission system for performing multicast...
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7415074 |
MIMO transmission and reception methods and devices
In a wireless transmitting device which performs transmission by an OFDM using a plurality of subcarriers orthogonal to each other, a plurality of preambles to which a plurality of different...
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7412005 |
Method and apparatus providing time domain interpolated channel estimation with advanced noise suppression for multicarrier transmissions
Disclosed is an interpolation procedure for channel estimation that is based on minimum mean-squared error (MMSE) estimates over comb-type pilot signals. The time domain (TD) interpolated channel...
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7412209 |
Shifted channel characteristics for mitigating co-channel interference
Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises shifting a characteristic of the...
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7411898 |
Preamble generator for a multiband OFDM transceiver
Preamble generator for a multiband frequency division multplexing (OFDM) tranceiver of a wireless personal area network (WPAN) being switchable between a time frequency interleaving (TFI)-mode...
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7411928 |
Simplified decoder for a bit interleaved COFDM-MIMO system
Multiple input multiple output (MIMO) systems are candidates for higher data rate wireless communication systems. Currently, for a single input single output (SISO) 1802.11a system can provide a...
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7411896 |
Method, apparatus, and system for power amplifier efficiency improvement
According to one embodiment of the present invention, a method is provided in which a set of data symbols is partitioned into a plurality of subsets. The data symbols are used to modulate the...
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7408998 |
System and method for adaptive bit loading source coding via vector quantization
A communication system includes a data transmitter and a data receiver in which the data transmitter transmits data using a multicarrier modulation, such as an OFDM modulation technique. The data...
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7408997 |
Modulation/demodulation apparatus using matrix and anti-matrix
A modulation and demodulation system is provided. The system uses n sub-carrier frequencies and an oversampling positive integer and includes a modulation circuit and a demodulation circuit. The...
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7406127 |
Boundary tracking apparatus and related method of OFDM system
A boundary tracking method applied in an OFDM receiver includes generating a plurality of demodulated signal sets corresponding to part of sub-carriers of a packet according to different boundaries...
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7406129 |
Wireless communication apparatus and wireless communication system
A data transmission apparatus transmits data signals “S 1 ” and “S 2 ” containing identical serial data “ds” in two frequency bands, and a data reception apparatus receives those data...
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7406119 |
Method and apparatus for reducing signal processing requirements for transmitting packet-based data
A receiver circuit of the modem is coupled to receive a continuous analog signal from a communication channel. This analog signal includes both packet and idle information. A burst mode protocol is...
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7406141 |
Multi-band DMT receiver
There is disclosed a receiver for receiving a multi-band DMT signal. The receiver includes a plurality of demodulators, each demodulator having a discrete Fourier transform and being provided to...
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7406157 |
Methods and apparatuses for determining loop characteristics using an extended voice-band modem
Embodiments of the invention provide methods for determining the characteristics of a local loop using the multi-carrier tones of a DSL activation process. For one embodiment, one or more sets of...
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7406128 |
Communication system using orthogonal frequency division multiplexed signal
An orthogonal frequency division multiplexed signal generator comprises a data sequence conversion means, a power changing means, an inverse discrete Fourier transform part, and an orthogonal...
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7406126 |
Implementation of smart DSL for LDSL systems
Various embodiments for addressing the performance objectives of LDSL and examples of smart systems for LDSL are disclosed. An evaluation of the spectral compatibility of two LDSL modes based on...
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7406140 |
Wraparound canceller, relay system, and wraparound cancelling method
A loop interference canceller that carries out an adaptive operation of responding to time variations of the phase or level of loop interference wave or key station wave at high speed and with high...
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7403571 |
Method for eliminating reception interference signal of space-time block coded orthogonal frequency division-multiplexing system in high-speed mobile channel
Disclosed herein is a method for eliminating the reception interference signal of a Space-Time Block Coded Orthogonal Frequency-Division Multiplexing (STBC-OFDM) system in a high-speed mobile...
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7403569 |
Efficient low-power mode for multicarrier communications
Multicarrier modulated communications, involving a transmitting modem ( 30; 30 ′) and a receiving modem ( 40; 40 ′) that operate according to normal operating mode and a low-power, quiescent,...
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7403570 |
Preamble design for multiple input—multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system
One or more preambles are inserted into frames of Orthogonal Frequency Multiplexing (OFDM)-Multiple Input, Multiple Output (MIMO) signals. The preamble is received by the antennas of a receiver,...
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7400573 |
Dynamic allocation of cyclic extension in orthogonal frequency division multiplexing systems
Briefly, in accordance with one embodiment of the invention, an orthogonal frequency division multiplexing system may provide a dynamically calculated cyclic extension, the length of which may be...
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7400687 |
Multicarrier communication apparatus and multicarrier communication method
A sequence converting section 104 interchanges high-order bits where an error does not easily occur and low-order bits where an error easily occurs that are used by an M-ary modulating section ...
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7397874 |
Method and device for detecting vertical bell laboratories layered space-time codes
The present invention discloses a V-BLAST detection method for a MIMO system, including: a first detecting step for acquiring in sequence the old detection components of a transmitting symbol...
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7397862 |
Method of designing interleavers for multiple-encoder MIMO OFDM systems
An improved interleaver design to fully explore the diversity of the MIMO OFDM systems provides higher diversity gain than usual. A method for wireless data communication using such interleaver...
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7397860 |
Fractional local peak detection and mitigation for PAR reduction
A method and system for reducing the power to average ratio (PAR) at the transmitter and after the up sampling and interpolation filter. In the time domain, Fractional Local Peak Detection and...
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7397861 |
Mapping strategy for OFDM-based systems using H-ARQ
A wireless communication device, method and system adapted so that, in response to a repeat request indicating a communication signal (because of an error in transmission of the communication...
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7397859 |
Multi-carrier communication systems employing variable symbol rates and number of carriers
A multi-carrier communication system such as an OFDM or DMT system has nodes which are allowed to dynamically change their receive and transmit symbol rates, and the number of carriers within their...
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7397826 |
MIMO transmission system in a radio communications network
Described is a transmission system ( 10 ) for transmitting an information signal ( 21 ) via a plurality of subchannels from a transmitter ( 12 ) to a receiver ( 16 ). The transmitter ( 12 )...
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7394859 |
OFDM signal receiving apparatus and an OFDM signal receiving method
An apparatus includes a converter separating the OFDM signal into the several sub-carriers, an extraction circuit extracting the reference symbol from at least one of a plurality of sub-carriers,...
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