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7492843 |
Method of synchronization for packet based, OFDM wireless systems with multiple receive chains
A system for synchronizing a wireless receiver is provided. The system includes a first antenna ( 101 a ) and a second antenna ( 101 b ) to receive wireless signals containing data packets. The...
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7492294 |
Receiving method with digital level adjustment in the analog section and incremental level change in the digital section
In an analog receiving section of a receiving device, the level of a received signal is adjusted by a first correction factor corresponding to a first digital level correction signal. Following...
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7492827 |
Method for data transmission via a data transmission path with inductive transformers, and a data transmission apparatus
A method and an apparatus for data transmission via a transmission path having at least two inductive transformers, which each have a primary winding with a time constant and have a secondary...
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7489734 |
Equalization in radio receiver
A solution for equalization in a radio receiver is provided. According to the provided solution, equalization with a zero forcing equalization algorithm is improved with frequency domain processing...
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7489736 |
Block modulation
A device and method for block transmission include a storage configured to store at least one transmission matrix relating to a set of symbols, and a processor configured to process at least part...
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7489733 |
Channel estimation using a minimized channel prediction interval
A receiver configured for: a) receiving ( 410 ) a first OFDM symbol and generating a plurality of demodulated symbols for the first OFDM symbol; b) generating ( 420 ) decoder output code symbols...
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7489621 |
Adaptive puncturing technique for multicarrier systems
Various embodiments are described for adaptive puncturing techniques involving an adaptive bit loading block to select a modulation scheme and a puncturing pattern for each of a plurality of...
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7489732 |
Decreasing computational complexity of TD-SCDMA measurement process
The embodiments of the present invention relate to the general area of wireless communication systems and, in particular, to fast and efficient measurement techniques for TD-SCDMA technology. The...
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7489731 |
Communication system using OFDM
The OFDM communications system for wireless networks includes at least one transmitter and at least one receiver. Each transmitter includes a signal source, a transmit modulator that arranges the...
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7489622 |
Transmitting apparatus, receiving apparatus, communication system, transmission method, reception method, and communication method
A transmitting apparatus, receiving apparatus, communication system, and a signal processing method for each apply a suitable modulation method and transmission path estimation method in accordance...
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7486754 |
System clock distributing apparatus and system clock distributing method
To provide a system clock distributing apparatus and a system clock distributing method for reducing a skew of a system clock and a synchronizing signal at low cost. The system clock distributing...
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7486751 |
Joint time/frequency domain maximum ratio combining architectures for multi input multi output wireless receivers
A multi input multi output (MIMO) receiver for receiving signals having a synchronization (SYNC) module being responsive to a plurality of received baseband signals for processing the same to...
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7486737 |
Apparatus and method of controlling a physical layer of a communication device
Embodiments of the invention describe a method and device for controlling a physical layer of a communication device to operate in one of three modes of communication. In a first mode, the device...
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7486738 |
Apparatus and method for reducing the crest factor of single carrier or multi-carrier signals
An apparatus for reducing the crest factor of a multi-carrier transmission system. The apparatus comprises a plurality of single carrier crest factor reduction circuits. Each of the single carrier...
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7486735 |
Sub-carrier allocation for OFDM
The present invention divides the available sub-carriers in an OFDM symbol window into N groups of sub-carriers wherein each group will be associated with sub-bands. In one embodiment, the...
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7486752 |
Alignment of clock signal with data signal
A multi input multi output (MIMO) receiver for receiving signals having a synchronization (SYNC) module being responsive to a plurality of received baseband signals for processing the same to...
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7486739 |
Transmission method and transmitter
A transmitter and an applicable method include an antenna system for achieving two transmit paths, a first modulator for modulating a signal to be transmitted into complex modulation symbols, and a...
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7486736 |
Apparatus and method for direct measurement of channel state for coded orthogonal frequency division multiplexing receiver
An apparatus and method for direct measurement of the channel state of a receiver, such as an OFDM (Orthogonal Frequency Division Multiplexing) receiver. The apparatus adapts a frequency selective...
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7483366 |
STFBC coding/decoding apparatus and method in an OFDM mobile communication system
A mobile communication system modulates input data with a specific size into an OFDM symbol and transmits the OFDM symbol through an antenna. In the mobile communication system, a replica generator...
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7483472 |
Apparatus and method for transmitting and receiving data in a code division multiplexing-frequency hopping-orthogonal frequency division multiple access communication system
A system and method for transmitting data by a base station in a multiple access communication system including a plurality of sub-channels, each of which includes a predetermined number of...
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7483490 |
Method for transmitting wideband signals via a communication system adapted for narrow-band signal transmission
A communication system is used to transmit and receive data on a plurality of relatively narrow-band signals and wideband signals. The two signal types share a common electromagnetic spectrum by...
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7483491 |
Linear transformation circuits
A transform circuit includes a first circuit and a second circuit. The first circuit and the second circuit implement first and second mappings that together generate a pre-defined transform of N...
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7483365 |
Process for obtaining notches in the transmission of signals over the electricity network
This permits the transmission of signals over the electricity network in such a way that the spectral density of power is adjusted to the regulations in the current rules by means of the...
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7483492 |
GMSK and OFDM nonlinearly and linearly amplified cellular and wireless networks
Processor, transmit filter and modulator for processing, filtering a signal into time division multiplexed (TDM) Gaussian filtered signal and into Orthogonal Frequency Division Multiplexed (OFDM)...
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7480498 |
Receiver gain control using a pilot signal
A method and system is disclosed for perform receiver gain control. A pilot signal is transmitted prior to each transmit period to facilitate an initial gain setting for a corresponding receiver...
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7480336 |
Multi-carrier transmission systems and methods using subcarrier relocation and guard interval insertion
There is provided a multi-carrier transmission system which includes: an encoder for converting a data sequence into encoded symbols corresponding to respective sub-carriers; a first shifter for...
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7480337 |
Tracking system comprised in an OFDM receiver
According to one embodiment, a method for tracking rapid changes in frequency and phase offset in an Orthogonal Frequency Division Multiplexing (OFDM) receiver includes correcting a frequency error...
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7477693 |
Reduced complexity channel estimation for wireless communication systems
Techniques to derive a channel estimate using substantially fewer number of complex multiplications than with a brute-force method to derive the same channel estimate. In one method, an...
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7477697 |
Multiplexing method in a multi carrier transmit diversity system
The invention relates to a method of multiplexing data words in a multicarrier transmit diversity system. The method comprises the step of generating a plurality of data blocks, each data block...
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7477633 |
Method and apparatus for varying the number of pilot tones in a multiple antenna communication system
Methods and apparatus are provided for varying the number of pilot tones in a multiple antenna communication system. Data is transmitted in a multiple antenna communication system by selecting a...
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7477699 |
Transmission technique selector for radio communication systems with multiple transmit and multiple receive antennas
A radio communications device ( 102 ) that has multiple receive antennas processes received data communications signals to select between space time coding and spatial multiplexing as a selected...
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7477677 |
Method and apparatus for multipath demodulation in a code division multiple access communication system
Multipath RAKE receiver structure that allows for the concurrent demodulation of multipath signals that arrive at the receiver at arbitrarily low arrival time differences. The fingers are set to be...
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7471729 |
Multicarrier transmission apparatus and multicarrier transmission method
A multicarrier transmission apparatus and multicarrier transmission method that achieve a desired transmission rate without arranging a plurality of transmission antennas apart from each other. A...
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7471732 |
Method and apparatus for training using variable transmit signal power levels
A method and apparatus for a multiple channel communication device training, and processing utilizing a transmit signal power control operation. Multiple channel communication devices utilize...
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7471728 |
Multicarrier signal, method of tracking a transmission channel based on such a signal and device therefor
The invention provides a multicarrier system constructed on a time-frequency lattice defined comprising frames having MxN symbols distributed over M subcarriers each of which is divided into N...
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7471730 |
Transmitting method and transmitting apparatus
Disclosed is a transmitting apparatus for transmitting a signal, which has been obtained by applying an inverse Fourier transform to a plurality of digital subcarrier signals having frequencies...
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7471740 |
ARQ retransmission with reordering scheme employing multiple redundancy versions and receiver/transmitter therefor
An ARQ retransmission method in a communication system, wherein data packets comprising modulation symbols are retransmitted based on an automatic repeat request and subsequently combined with...
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7469019 |
Optimization technique for layered modulation
A method and apparatus for optimizing a system for transmitting a layered modulated signal is disclosed. The method comprises the steps of defining the system in terms of a set of system...
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7469028 |
Asymmetrical digital subscriber line system
An asymmetrical digital subscriber line (ADSL) communication system enhances the signal-to-noise ratio (SNR) of the received signals by conducting a PLL process with a tone conditioned on the most...
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7469013 |
Intelligent adaptive modulation in a multiple input multiple output (MIMO) wireless communications system
A wireless broadband communications system that can maintain high data rates while taking into account channel interference resulting from operating in shared frequency bands, signal fading...
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7466749 |
Rate selection with margin sharing
Rate selection with margin sharing in a system with independent data stream rates is presented. Signal-to-Noise Ratio (SNR) estimates are obtained for each stream. Rates are selected for the...
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7466750 |
Apparatus for channel equalization using multi antenna and method thereof
The present invention provides an apparatus for channel equalization and method thereof, by which a digital signal received via a plurality of antennas is equalized. The present invention includes...
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7463691 |
Feedback-type channel estimation method and a device based on a PN sequence and a pilot frequency in an OFDM system
The invention provides a feedback-type channel estimation method and device based on a PN sequence and a pilot frequency in an OFDM system, said method obtains an impulse channel estimation of this...
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7463678 |
Equalization scheme for DSL receivers in presence of an under-sampled or over-sampled transmit IDFT
A circuit and method is provided for reducing the effect of having potentially different sizes for an Inverse Discrete Fourier Transform (IDFT) at a transmitter and a Discrete Fourier Transform...
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7463576 |
Channel estimation for OFDM communication systems
Techniques to estimate the frequency response of a wireless channel in an OFDM system. In one method, an initial estimate of the frequency response of the wireless channel is obtained for a first...
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7463697 |
Multicarrier transmitter and methods for generating multicarrier communication signals with power amplifier predistortion and linearization
A multicarrier signal is generated by pre-compensating frequency-domain subcarrier symbols for substantially linear distortion subsequently introduced by a time-domain baseband filter.
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7460611 |
Communication system, transmitting apparatus and transmitting method, receiving apparatus and receiving method, unbalance code mixing method and multiple code decoding method
A transmitting station side transmits a transmitting signal obtained by a process of segmenting transmission information into a plurality of frames, of encoding each frame, of power amplifying each...
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7460833 |
Transmitting apparatus of communication system
A transmitting apparatus according to the present invention includes a prefilter for compensating a previously measured estimated impulse response of a communication system by assuming a...
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7460587 |
Electronic circuit for performing fractional time domain interpolation and related devices and methods
A clock offset compensation arrangement may include a fractional interpolator for applying a trigonometric interpolation to a sampled input signal according to a clock offset signal. It uses...
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7460615 |
Spatial and time multiplexing of multi-band signals
A multi-band receiver for use with satellite ranging systems is provided. The receiver has a simplified architecture in which input signals of various frequencies are multiplexed together to form a...
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