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7317763 |
Pulse generator, pulse generating method, communicating apparatus, and communicating method
A UWB wireless communicating system is provided. When a process of the system is started, an initial value x 0 is set to a storing portion. An output of the storing portion is supplied to a...
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7317770 |
Near-optimal multiple-input multiple-output (MIMO) channel detection via sequential Monte Carlo
A class of soft-input soft-output demodulation schemes for multiple-input multiple-output (MIMO) channels, based on the sequential Monte Carlo (SMC) framework under both stochastic and...
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7317761 |
Multi-carrier communication system and receiver thereof
The present invention is a multi-carrier communication system for transmitting/receiving signals via at least four sub-channels, comprising: a transmitter for transmitting data independently via...
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7315576 |
System for soft symbol decoding with MIMO log-map detection
A soft symbol decoder for use in a multiple input multiple output (MIMO) and OFDM (orthogonal frequency division multiplexing) system. The decoder generates soft symbol values for a digital signal...
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7315577 |
Multiple antenna systems and method using high-throughput space-frequency block codes
A multicarrier transmitter uses high-throughput space-frequency block codes to map transmit symbols to a particular transmit antenna and a particular subcarrier of a multicarrier communication...
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7313190 |
Efficient bit interleaver for a multi-band OFDM ultra-wideband system
An efficient bit interleaving scheme for a multi-band OFDM ultra-wideband (UWB) system. The encoded bits of the multi-band OFDM system are interleaved within each OFDM symbol and across OFDM...
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7313189 |
Receiver which demodulates OFDM symbol
A receiver is disclosed that demodulates an Orthogonal Frequency Division Multiplexing (OFDM) symbol transmitted by an OFDM method. The receiver includes a delay profile generation unit that...
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7313085 |
Method for creating symmetric-identical preamble and method for synchronizing symbol and frequency of orthogonal frequency division multiplexed signals by using symmetric-identical preamble
A method for synchronizing symbol timing and frequency of symmetric-identical (SI) Orthogonal Frequency Division Multiplexed signals (OFDM) wherein an SI preamble is used for calculation of the...
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7313188 |
Subcarrier time offsets for improved peak-to-average power of a transmitter
A system, wireless device ( 102 ) and method reduce the peak-to-average power of a transmitter by creating at least two sampled carrier data streams, running each carrier through a separate delay...
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7310302 |
Method for estimating time and frequency offset in an OFDM system
A synchronization technique computes, in the frequency domain, a differential-in-frequency function across a large number of OFDM tones, to develop robust estimates of time and frequency offset....
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7310378 |
Estimating a transmission channel with pilot symbols distributed in lattice structure
A method for estimating a transmission channel from a multicarrier signal transmitted through said transmission channel, comprising real pilot symbols and so-called pure imaginary pilot symbols,...
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7308052 |
Radio transmitter apparatus and modulation scheme selecting method
A wireless transmission apparatus that can accurately select an optimal modulation scheme on a per block basis in a multi-carrier communication system in which block division of subcarriers and...
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7308034 |
Method and device for tracking carrier frequency offset and sampling frequency offset in orthogonal frequency division multiplexing wireless communication system
A method for tracking carrier frequency and sampling frequency offsets in an OFDM wireless communication system comprises: (a) detecting data received from the transmitter using a first signal, and...
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7307953 |
Scheduling for non-real-time services in orthogonal frequency division multiplex (OFDM) systems
Sub-carriers are allocated among the plurality of users in the OFDM system based on normalized channel gain values. Then, data bits are allocated for transmission on the allocated sub-carriers...
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7308033 |
Apparatus and method for tracking residual frequency offset for single carrier-frequency domain equalizer system
A method for tracking a residual frequency offset for a single carrier-frequency domain equalizer system includes: determining a pilot from the data and known pilot data, adding the determined...
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7308063 |
Apparatus, and associated method, for effectuating post-FFT correction of fine frequency offset
In an orthogonal frequency division multiplexing (OFDM) system, a receiver of an OFDM signal via an air interface defines training symbols to be included in the frame structure of the air interface...
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7305041 |
Peak suppression of multi-carrier signal with different modulation
A technique for peak suppression, phase and amplitude equalizer of multi-carrier signals with different modulation is described. The input to the multi-carrier power amplifier is modified by a peak...
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7305057 |
Multichannel filter-based handheld ultra wideband communications
A multichannel filter-based handheld UWB communication transceiver is presented for outdoor operations. Using eleven multichannels with multicarrier modulations, the invented handheld UWB...
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7305055 |
Search-efficient MIMO trellis decoder
A decoder generates distance and label metrics associated with each label of a coset transmitted in a multi-input multi-output communication system having M t transmit antennas and M r receive...
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7302021 |
Digital broadcast receiving apparatus
In a digital broadcast receiving apparatus for amplifying a received modulated digital signal wave with automatically adjusted gain and demodulating the modulated signal wave to a digital signal, a...
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7298785 |
Multicarrier demodulation method and apparatus, and multicarrier modulation method and apparatus
A method and apparatus for receiving a modulated signal which consists of N subcarriers containing N-L (L<N) nullcarriers and in which an effective symbol has a length T, and a frequency...
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7298787 |
System, and associated method, for facilitating broadband multi-carrier transmission
A method for facilitating broadband multi-carrier wireless transmission, whereby a plurality of transmit antennas are divided into two or more transmit antenna groups of transmit antennas so that...
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7298772 |
Packet detection, symbol timing, and coarse frequency estimation in an OFDM communications system
A integrated system for generation of packet detection, symbol timing, and coarse frequency offset for an orthogonal frequency division multiplexed (OFDM) receiver having a stream of input symbols...
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7295518 |
Broadband network for coaxial cable using multi-carrier modulation
A broadband local area data network uses coaxial cable wiring for interconnection of terminal devices. Orthogonal frequency division multiplexing (OFDM) with bit loading is used to overcome channel...
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7295621 |
Communication start-up with variant spectral density mask
A method is provided for initiating communications over a channel between a transmitter and a receiver within a specified spectral range, subject to a mask to be applied at the transmitter so as to...
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7295626 |
Orthogonal division multiple access technique incorporating single carrier and OFDM signals
A multiple access technique is described, which is capable of maintaining orthogonality between transmitted signals in multipath conditions, even when part of or all of the transmitted signals...
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7292641 |
Apparatus and method for transmitting/receiving preamble sequence in orthogonal frequency division multiplexing communication system using plurality of transmission antennas
A method for generating a preamble sequence in an OFDM (Orthogonal Frequency Division Multiplexing) communication system that uses A sub-carriers in a frequency domain and uses N Tx (Transmission)...
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7292638 |
Transform-based alias cancellation multi-channel tuner
A satellite receiver includes a signal cancellation tuner for processing a plurality of different transponder signals to simultaneously provide a plurality of different bit streams. The signal...
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7292651 |
Pilot-aided channel estimation for OFDM in wireless systems
A method and apparatus for pilot-symbol aided channel estimation in a wireless digital communication system which transmits packets of N OFDM data blocks, each data block comprising a set of K...
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7292640 |
System and method for an adaptive receiver for the reception of signals subject to multipath interference
Disclosed is an inventive system and method for extracting signal energy from the guard time portion of a communication frame based on the amount of multipath interference experienced by that...
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7292642 |
Reference symbol multicarrier signal designed to limit intersymbol interference
The invention relates to a multicarrier signal consisting of a temporal succession of symbols formed by a set of data elements, each of said data elements modulating a carrier frequency of said...
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7292639 |
Method and apparatus for peak to average power ratio reduction for orthogonal frequency division multiplex systems
A multi-stage signal processing method is provided that reduces the Peak to Average Power Ratio (PAPR) of an Orthogonal Frequency Division Multiplexed (OFDM) signal without increasing the bit error...
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7292626 |
Method and system for efficient quantization in DAC and ADC for discrete multitone systems
An ADSL modem includes a modulator unit with an output analog expander and/or a demodulator unit with an input analog compressor. The modulator unit further includes (a) a first DSP engine...
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7289567 |
Apparatus and method for transmitting and receiving data using partial chase combining
An apparatus and method for transmitting and receiving data, wherein retransmissions of information can be a different size from the initial transmission. The invention utilizes a partial Chase...
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7289765 |
OFDM demodulator
An OFDM demodulator includes an FFT circuit, a phase correction circuit, and a timing synchronization circuit. The timing synchronization circuit includes a symbol-boundary calculation circuit to...
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7286611 |
Roadway communication system
Road transmission antennas ( 4 a, 4 b ) are disposed along a road, each radiating a single cell (E) with electromagnetic waves at the same frequency and of the same content. A vehicle mounted...
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7286607 |
Energy-control method and apparatus for digital diversity signaling
A method of communicating digital signal information through diversity signaling with a constrained amount of transmission energy-per-bit available E tot . The method includes steps of: measuring...
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7286570 |
High speed sequenced multi-channel bus
Apparatus for transmitting a data stream between cards connected by a midplane breaks the data stream into a plurality of channels. The apparatus comprises a serializer for each channel. Serialized...
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7286466 |
Multicarrier systems
In an OFDM receiver the complex values of predetermined pilot sub-carriers are compared with expected values to determine pilot distortion values for those sub-carriers. The phases of the...
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7286603 |
Method and apparatus for increasing data rates in a wideband MC-CDMA telecommunication system
A system and method for the efficient transmission of information in a code division multiple access (CDMA) wireless telecommunication system. To increase the rate of reliable transmission, an...
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7286604 |
Carrier interferometry coding and multicarrier processing
Carrier Interferometry (CI) codes include families of orthogonal polyphase codes that have no length restrictions and can be used for direct-sequence and multicarrier coding. Quasi-orthogonal CI...
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7286605 |
Method and apparatus for reducing a crest factor of a multi-tone data signal
A crest factor reduction circuit for reducing a crest factor (CF) of a multi-tone-data signal which is transmitted in a predetermined transmission frequency band, wherein the crest factor...
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7286602 |
Method of data transmission for N-channel digital data in an M-channel block format
An audio data transmitting device with a varying channel count which on the transmission side includes, data of n channels divided into blocks each defined for m channels where n≦m. In addition,...
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7286606 |
System and method for channelization recognition in a wideband communication system
The channelization of a WB OFDM channel may be determined by detecting a plurality of subchannels and generate a channelization vector indicating which of the subchannels are active and which of...
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7283499 |
Simplified practical rank and mechanism, and associated method, to adapt MIMO modulation in a multi-carrier system with feedback
A method of adapting transmission parameters in a multicarrier communication system having multiple transmit antennas and/or multiple receive antennas, whereby a statistical parameter of a wideband...
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7283583 |
Adaptive rate transmission with dual noise margins
A method for adaptive-rate communication includes setting a first target signal margin with respect to an actual noise level and a second target signal margin with respect to a predetermined noise...
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7283595 |
Ultra wide band pulse train generator
An ultra wide band (UWB) pulse train generator, which includes a trigger signal controller for sequentially outputting n trigger signals for triggering generation of UWB pulse train in accordance...
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7280605 |
Orthogonal frequency division multiplexing (OFDM) receiver used in wireless local area network system and symbol timing synchronization method therefor
An Orthogonal Frequency Division Multiplexing (OFDM) receiver of a wireless Local Area Network (LAN) system uses double cross-correlation and double peak-value comparison for symbol timing...
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7280604 |
Space-time doppler coding schemes for time-selective wireless communication channels
Space-time Doppler (STDO) coding techniques are describe for time-selective channels. In particular, a STDO coded system is capable of achieving a maximum Doppler diversity for time-selective...
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7280603 |
DSL receivers for TCM-ISDN environments and methods of operating same
A digital subscriber line (DSL) receiver includes a discrete multitone (DMT) receiver circuit operative to receive a DSL signal and to generate signal samples corresponding to respective frequency...
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