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7630447 |
System of communication between synchronized submarine devices
The invention relates to a system and a method of digital communication between synchronized submarine devices, system including means of sending a signal in modulated bit form, at least one sender...
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7623561 |
Channel characteristics estimation system, channel characteristics estimation method, communication apparatus, and communication method
Channel characteristics need to be estimated in a wireless communication system which performs frequency hopping. A transmission side aligns phase values of carriers of frequencies used for hopping...
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RE40986 |
Channel simulator for mobile systems
A device and a method at a mobile communication system which provide a flexible and realistic way of emulating the time dispersive qualities and the broadband frequency correlation qualities of a...
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7616606 |
Mechanism for avoiding triggering silent radio squelch circuits
A ‘smart’ sub-channel hopping control mechanism executes one or more sub-channel selection discriminators to enable the communications controller of a spectral reuse transceiver to delineate on...
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7613223 |
Time-frequency coding in a multi-band ultra-wideband system
Time-frequency coding in a multi-band ultra-wideband system is generally described. In this regard a hopping code agent is presented to select a frequency hopping code for encoding and decoding...
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7613229 |
Method and apparatus for combined finger management and finger lock for a multipath signals in a wireless communication system
A method of managing fingers for multipath signals in a wireless communication device. In one embodiment, the present invention recites receiving multipath signals at a wireless communication...
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7613258 |
Apparatus and method for determining GPS tracking loop parameter based on SNR estimation
A method for estimating signal quality of a spread spectrum signal is provided. The method includes squaring a plurality of in-phase correlation results and a plurality of quadrature correlation...
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7606327 |
Method to receive local information with a national broadcast service
A receiver is disclosed. The receiver includes a first antenna, a second antenna, a system controller, a national broadcast demodulator, a local broadcast demodulator, and an information output...
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7606288 |
Burst spread spectrum radio system and method for asset tracking and data telemetry
A system for wireless asset tracking is disclosed. The system includes a plurality of mobile devices. Each mobile device performs two spreading operations with two distinct PN codes, a first PN...
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7606290 |
Architecture for signal acquisition with cyclic range search
An architecture for a spread-spectrum transmitter-receiver system in an advanced tactical data link that allows the receiver to readily acquire and synchronize to a desired LPD signal. Signal...
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7606320 |
Apparatus and method for space-frequency block coding/decoding in a communication system
An apparatus and method for SFBC coding and decoding in a communication system using a plurality of (N t ) Tx antennas are provided. In a transmitter using N t transmit antennas, a pre-coder...
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7602835 |
Multi-rate spread spectrum composite code
A correlator despreads a P/N long code constructed from two or more constituent codes A, B, C having N, M and L elements respectively. In a third stage, L filter taps decorrelate elements of the...
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7602834 |
System and method for determining a fine frequency offset of a received signal
A system and method for determining a fine frequency offset of a composite code spread spectrum signal is disclosed. The method includes despreading at least one component of the composite spread...
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7599344 |
Method and apparatus for reducing multi-user processing in wireless communication systems
A method and apparatus is disclosed for reducing multi-user processing at the receiver in wireless communication systems. Detected codes are grouped according to channel impulse response and a...
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7599421 |
Spread spectrum applications of universal frequency translation
Frequency translation and spread spectrum applications of same are described herein. Such applications include, but are not limited to, unified down-conversion and de-spreading, unified...
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7586975 |
Code tracking apparatus and method under a multi-path environment in a DS-CDMA communication system
Disclosed is a code tracking apparatus and method under a multi-path environment in a DS-CDMA communication system. Through the steps of calculating fast path energy on a first path signal by...
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7583737 |
OFDM signal receiver device and OFDM signal receiving method
The present invention relates to a OFDM signal receiver device that performs weighting for branch metrics based on average noise power or signal-to-noise power ratio and conducts Viterbi decoding...
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7580475 |
Base station having a set of phased array antennas
A spread spectrum base station for receiving a plurality of spread spectrum signals and a plurality of phased spread spectrum signals includes an antenna and a plurality of delay devices connected...
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7580390 |
Reducing handover frequency error
Frequency estimation information obtained when a wireless communication device (WCD) is in one wireless communication system, such as frequency error or offset information, may be translated to a...
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7580466 |
Demodulation device and demodulation method
The present invention relates to a demodulation device and a demodulation method, and its object is to demodulate subcarrier components utilizing estimated delay profiles to control the timing for...
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7561613 |
Digital carrier multi-band user codes for ultra-wideband multiple access
Techniques are described for generating digital carrier multi-band user codes for a baseband ultra-wideband (UWB) signal. The digital carrier multi-band user codes comprise spreading codes that...
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7558310 |
Multi-scale code division frequency/wavelet multiple access
A new communications architecture combines orthogonal frequency division multiple access OFDMA and orthogonal Wavelet division multiple access OWDMA with multi-scale code division multiple access...
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7555031 |
Digital wireless audio receiver system employing time diversity
A receiver system that receives and recovers digital data on a fixed frequency channel of a radio frequency band in the presence of interference from at least one FHSS interference source. The...
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7548577 |
Frequency domain joint detection for wireless communication systems
A method and apparatus for frequency domain joint detection for multicarrier code division multiple access (MC-CDMA) and spread orthogonal frequency division multiple access (OFDMA) systems are...
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7548578 |
Digital frequency hopping transceiver and method thereof
The digital frequency-hopping (FH) transceiver and the method thereof can be applied to FH communication system with a short FH time. The transceiver employs a digital signal processing (DSP) in...
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7545854 |
Doppler corrected spread spectrum matched filter
A method and apparatus for a spread spectrum matched filter with Doppler correction suitable for using in a radio frequency receiver. The system includes a signal sampler operable to receive signal...
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7542504 |
Frequency hopping ofdma method using symbols of comb pattern
Method for providing frequency-hopping OFDMA using symbols of comb patter, the method including the steps of: a) assigning frequency domain signal X(k) of comb pattern (comb symbol, k is frequency...
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7539167 |
Spread spectrum receiver and method for carrier frequency offset compensation in such a spread spectrum receiver
The invention relates to a spread spectrum receiver for receiving and decoding an input signal r(k) consisting of a sequence of chips and a method for carrier frequency offset compensation in such...
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7535983 |
Method for identifying the beginning of a UWB pulse sequence
A method for transmitting data in the form of pulse sequences, including a signal synchronization step carried out by a receiver of dataframes DF, in the course of which at least one time window...
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7535952 |
Reception apparatus and method of a mobile station in an mobile communication system
Disclosed is a reception apparatus and method of a mobile station in a Software Defined Radio (SDR) mobile communication system. A radio frequency (RF) processor converts a received RF signal into...
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7535953 |
Time information transmitter-receiver, and time information transmission-reception integrated circuit
A time information transmission-reception integrated circuit includes: a reception control circuit for detecting a signal obtained by receiving and amplifying an external radio wave, and generating...
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7532658 |
Apparatus for reducing electromagnetic interference and method therefor
An apparatus for reducing electromagnetic interference and a method therefor. The invention generates a spread-spectrum clock according to an original clock, receives a data bit stream according to...
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7529177 |
Dithering scheme using multiple antennas for OFDM systems
A ground-or roof-top-based repeater in an OFDM system uses multiple transmission antennas to retransmit satellite signals. By using multiple transmission antennas, multiple identical OFDM signals...
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7526010 |
Doped multi-rate spread spectrum composite code
A composite code is made for example by exclusive-OR'ing each real element of a first constituent code A with each element of a second constituent code B to obtain a basic composite code. To...
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7522653 |
System and method for PN correlation and symbol synchronization
A method is disclosed for PN correlation and symbol synchronization of a spread spectrum signal at a receiver when a symbol boundary of the spread spectrum signal is not on a PN epoch or is...
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7522658 |
Design method and implementation of optimal linear IIR equalizers for RF transceivers
A digital filter with equalizers and a corresponding method for optimizing a linear equalizer of an RF transceiver determining filter characteristics of the specified analog filter, determining...
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7515653 |
Digital broadcasting receiver, driving method thereof, and self-diagnosis method thereof
A digital broadcasting receiver, a driving method, and a self-diagnosis method thereof, are provided. The digital broadcasting receiver includes: a digital demodulator for demodulating a digital...
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7515644 |
Apparatus and method for space-time-frequency block coding for increasing performance
A space-time-frequency block coding apparatus and method in a transmitter with three transmit (Tx) antennas are provided. An input symbol sequence is transmitted through three Tx antennas according...
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7515627 |
System and method for ultra-wideband (UWB) communication transceiver
An ultra-wideband (UWB) transceiver for use in UWB communication includes a voltage-controlled oscillator (VCO) configured to periodically and sequentially generate a series of base frequencies...
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7515628 |
Portable terminal set and control method thereof
Monitoring is made as to whether the serial number of header incorporated to the data sent to a Radio Link Control (RLC) after a decoding process is continuous. When it is determined as a result of...
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7508860 |
Pulse signal generator for ultra-wideband radio transception and radio transceiver having the same
Provided are a pulse signal generator for UWB radio transception and a radio transceiver having the same. The pulse signal generator includes: an envelope generator generating a plurality of...
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7499417 |
Apparatus and method for controlling an output buffer in a hybrid automatic repeat request (HARQ) mobile communication system
A mobile station apparatus and method provide for receiving packet data transmitted over a packet data channel, decoding the received packet data and delivering the decoded packet data to an upper...
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7499509 |
Receiver for compensating nonlinearly distorted multicarrier signals
An apparatus for compensating nonlinearly distorted multicarrier signals, a multicarrier signal receiver using the same, and a method therefor are provided, where the apparatus for compensating...
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7499483 |
Receiver capable of enhancing receiving efficiency in a code division multiple access communication system
A receiver capable of enhancing receiving efficiency in a code division multiple access communication system includes a signal reception end for receiving signals, a data output unit for outputting...
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7492808 |
Decoding method using adaptive step-size algorithm for a space-time coded DS-CDMA system
Disclosed is a method for decoding received signals on communication channels between at least one transmit antenna and plural receive antennas in a space-time coded direct sequence (DS)-CDMA...
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7489755 |
Method and apparatus for transmission and reception of data
Various embodiments are described to provide for the transmission and reception of data in an improved manner. Data transmission is improved by including in a transmitter a null generator ( 110 )...
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7480344 |
Architectural techniques for envelope and phase signal alignment in RF polar transmitters using power amplifier feedback
In an envelope comparison embodiment, a delay calibrator produces a delay signal based on a comparison of a feedback signal and an envelope component of the transmitted signal. A down-converter...
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7480349 |
Low IF receiver systems and methods
Embodiments of a low intermediate frequency system and method are disclosed. In one embodiment, among others, a method for operating a receiver is disclosed that comprises receiving a radio...
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7480516 |
Method and apparatus of forward link and reverse link power control in a cellular wireless communication system
A cellular wireless communication system includes base transceiver stations and mobile stations that operate with a closed loop power control. The mobile tracking is performed based on the lock in...
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7474688 |
System and method for detecting multiple direct sequence spread spectrum signals using a multi-mode searcher
System and method for detecting multiple direct sequence spread spectrum signals using a multi-mode searcher. A preferred embodiment comprises the specification of a hypothesis for a particular...
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