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7561628 |
Apparatus and method for cell acquisition and downlink synchronization acquisition in a wireless communication system
An apparatus and method for cell acquisition and downlink synchronization acquisition in an OFDMA wireless communication system are provided. In an SS apparatus in a broadband wireless...
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7555034 |
Apparatus and method for detecting timing error based on cyclic correlation
Provided is an apparatus and method for detecting timing errors based on characteristics of cyclic correlation. The apparatus and method can detect the timing errors of many users by using the...
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7551666 |
Wireless communications system and wireless digital receiver for use therein
A base station 2 demodulates a wireless signal after downconverting the signal to a low-frequency signal whose center frequency is fi [Hz] and oversampling the signal. A mobile station 3 ...
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7551679 |
Symmetrical data signal processing
In a digital communications receiver configured to receive, via a communications channel, a received first signal representing a sequence of symbols, each symbol being encoded to be representative...
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7545770 |
Radio communication system and radio communication method
This object is to conclude an agreement for making an insertion interval of a pilot signal variable between radio communication apparatuses and improve a throughput of a communication. A pilot...
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7545874 |
Apparatus for pre-scaling data packets with multiple signal gain coefficients in a SIMO/MISO transceiver for communication with a SISO transceiver
Apparatus and method for use in packet data communication from a single-input-multiple-output/multiple-input-single-output (SIMO/MISO) transceiver to a single-input-single-output (SISO)...
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7542407 |
System and method for communicating digital information using time-and-frequency-bounded base functions
Systems and methods for efficiently conveying one or more broadband communication channels over a transmission medium. Communication is effected by transforming an incoming digital bit stream into...
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7539255 |
Using multiple pilot signals for timing error estimation in digital subscriber line communications
A receiving modem ( 20 ) including functionality for adjusting the synchronization of its timing relative to a transmitting modem ( 10 ), by recovering timing from a plurality of pilot tones...
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7539125 |
Method and circuit for frequency offset estimation in frequency domain in the orthogonal frequency division multiplexing baseband receiver for IEEE 802.11A/G wireless LAN standard
A method for frequency offset estimation in frequency domain is provided. The method comprises the following steps. First, a phase angle of a signal field of the input signal after processed by...
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7535822 |
Synchronization of remote units for a communication network
A method for maintaining the quality of transmission from a head end to a service unit in a telecommunications system that uses a multi-carrier transmission scheme with dynamic bandwidth allocation...
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7536168 |
Method, emitter and receiver for transmitting data in a multi-access CDMA system by fully complementary code matrixes for two-dimensional data spreading in a frequency and time direction
A method transmits data bits between at least one subscriber station and a transmitter in a radio communication system. Each data bit is transmitted on at least two different units of a first radio...
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7532599 |
Apparatus and method for allocating user in a multiple antenna mobile communication system supporting multi-user diversity
A user allocating apparatus and method in a multiple antenna mobile communication system supporting multi-user diversity is provided. Each user calculates effective Signal-to-Interference Noise...
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7532902 |
Method and apparatus for cell search in wireless communication system
Disclosed is an apparatus and a method for performing a cell search in a wireless communication system. A subscriber station calculates the power of subcarriers according to their positions in a...
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7532563 |
Mechanism to improve quality of channel estimates in OFDM transmissions
An OFDM (Orthogonal Frequency Division Multiplexing) system may utilize pilot symbol structures including two or more pilot symbols with pilot information on alternate tones. The pilot information...
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7529372 |
Method for setting an encryption key for logical network separation
A system and method is described for reliably transferring a node in a communications network from one Logical Network to another Logical Network. The system and method is reliable and robust with...
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7515875 |
Multi-carrier communication apparatus
A multi-carrier communications apparatus which communicates between a first station and a second station as a destination station using a reference signal used for estimating a state of a channel,...
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7512192 |
Phase conjugated vectoring of signals in telephone cables
A phase conjugation vectoring (PCV) of signals propagating in telephone cables of twisted pairs provides crosstalk free transmission therethrough. The cable is considered a non-uniform physical...
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7499391 |
Apparatus and method for allocating walsh codes to mobile stations in an adaptive antenna array wireless network
An apparatus for allocating orthogonal codes to mobile stations for use in a CDMA base station that transmits using an adaptive antenna array. The apparatus comprises a database for storing R...
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7492699 |
Method of reducing feedback channel state information within adaptive OFDMA system and adaptive OFDMA system using the same
A method of reducing channel state information fed back in an adaptive orthogonal frequency division multiple access system when transmitting and receiving data packets between a base station and a...
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7492702 |
Versatile system for optimizing data fragmentation in digital communications
The present invention provides a versatile system for optimizing data fragmentation in a digital communications—particularly OFDM communications—system. A digital transmission system ( 100 ) is...
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7489624 |
Scanning by remotes in multipoint-to-point communication using orthogonal frequency division multiplexing
Systems and methods for scanning by remotes in multipoint-to-point communication using orthogonal frequency division multiplexing are provided. In one embodiment, a system comprises a host unit;...
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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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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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7483364 |
Method and apparatus for detecting STBC-OFDM signals in time-variant channels
The present invention relates to a method and apparatus for detecting STBC-OFDM signals in time-variant channels. The method includes a step of demodulating STBC-OFDM modulation signals into OFDM...
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7480236 |
Multipoint-to-point communication using orthgonal frequency division multiplexing and identification codes
Systems for multipoint-to-point communication using orthogonal frequency division multiplexing and identification codes are provided. In one embodiment, a system comprises: a host unit; and a...
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7480353 |
Method and apparatus for estimating channel response and receiver apparatus using the estimated channel response for OFDM radio communication systems
An estimation apparatus for estimating a channel response of a radio propagation path using a received signal including a first known signal, comprises a generator which generates a reference...
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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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7477703 |
Method and radio system for digital signal transmission using complex space-time codes
The invention relates to a method and an arrangement for transmitting a digital signal consisting of symbols, which arrangement comprises a coder ( 308 ) for coding complex symbols to channel...
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7474611 |
Reduced complexity channel estimation in OFDM systems
A channel response estimate is generated from a received signal that comprises two or more different pilot carriers in an Orthogonal Frequency Division Multiplexing (OFDM) communications system....
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7474608 |
Method for signaling information by modifying modulation constellations
Methods and systems for communicating in a wireless network may distinguish different types of packet structures by modifying the phase of a modulation constellation, such as a binary phase shift...
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7474610 |
OFDM automatic frequency control device and method thereof
An OFDM frequency control device converts an incoming signal from analog to digital and calculates a correlation value between the guard interval and data part from which the guard interval is...
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7474609 |
Frequency-division multiplexing transceive apparatus and method
In a frequency-division multiplexing transmitting apparatus for transmitting data at a frequency specific to a mobile station, a symbol compression and repetition unit compresses the time domain of...
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7468943 |
Transmission/Reception apparatus and method in a mobile communication system
Disclosed is a transmission/reception apparatus and method for providing compatibility between Code Division Multiple Access (CDMA) and Orthogonal Frequency Division Multiplexing (OFDM) in a...
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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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7460876 |
System and method for intelligent transmitted power control scheme
Briefly, an adaptive transmitted power control scheme, which may be used in stations of a communication system, for example, a wireless communication system. The scheme may allocate transmission...
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7453792 |
Receiver architecture for pilot based OFDM systems
The invention relates to a novel methodology and apparatus for clock-offset compensation and common-phase offset correction in Frequency Division Multiplexing based wireless local area network...
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7453793 |
Channel estimation for OFDM communication systems including IEEE 802.11A and extended rate systems
Channel estimation techniques are provided for a receiver of a wireless communication system using orthogonal frequency division multiplexing (OFDM), including legacy 802.11a and various extended...
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7450653 |
Digital broadcast signal receiving apparatus and method
A signal receiving apparatus and method which is high in deduction accuracy of transfer characteristic and less in error rate during signal decoding. For each detection signal of a pilot carrier...
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7450542 |
Method for frequency division duplex communications
The high quality PCS communications are enabled in environments where adjacent PCS service bands operate with out-of-band harmonics that would otherwise interfere with the system's operation. The...
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RE40568 |
Synchronization symbol structure using OFDM based transmission method
The present invention proposes a method for generating synchronization bursts for OFDM transmission systems. The symbols of a predefined symbol sequence are mapped according to a predefined mapping...
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7443782 |
Adaptive inter-carrier interference self-cancellation method and transceiver thereof
The present invention discloses an adaptive ICI self-cancellation method, which can adapt to the dynamical change of frequency offset and signal-noise power ratio (SNR), and a device thereof. The...
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7443784 |
Methods and systems for tone hopping
Methods and systems for tone hopping are provided. In one embodiment, a method for an orthogonal frequency division multiplexing (OFDM) multipoint-to-point communications system comprises:...
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7440391 |
Method and system for dynamic bandwidth allocation
Systems and methods for bidirectional communication are provided. In one embodiment, a bidirectional communication comprises a multipoint-to-point host unit and a plurality of remote units...
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7436802 |
Frequency hopping method in orthogonal frequency division multiplexing system
Disclosed is a frequency hopping method in an OFDM system, comprising: (a) detecting a mutual interference degree between different cells, and determining whether to use different frequency hopping...
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7436758 |
Apparatus and method for transmitting/receiving pilot pattern set to distinguish base station in orthogonal frequency division multiplexing (OFDM) communication system
An apparatus and method for transmitting/receiving a pilot pattern set to distinguish a base station in an FDM communication system. The method divides a total frequency bandwidth into at least two...
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7436757 |
Scattered pilot and filtering for channel estimation
Methods of improving channel estimation are described, in which pilot symbols are inserted into orthogonal frequency division multiplexing (OFDM) frames at an OFDM transmitter having at least one...
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7433296 |
Mode detection for OFDM signals
A method and apparatus for detecting the transmitted mode and guard interval length. The mode detection is adopted by the DVB-T system to increase system flexibility and combat multi-path...
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7433432 |
Adaptive detector for multiple-data-path systems
An adaptive, reduced-complexity soft-output maximum-likelihood detector that is operable to process data by adaptively selecting a processing scheme based on a determination of signal quality. The...
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7430190 |
Systems and methods for resource allocation to multiple antenna arrays for maintaining a constant bit rate (CBR) channel
A wireless communication system configured for the efficient allocation of resources is provided. The wireless communication system can include a transmit system having a first set of one or more...
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7426177 |
Round trip delay adjustment in multipoint-to-point communication using orthogonal frequency division multiplexing
Systems and methods for bidirectional communication are provided. In one embodiment, a method for aligning communications from a plurality of remote units in a multipoint-to-point orthogonal...
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