|
Match
|
Document |
Document Title |
|
|
6683929 |
Mobile communication device having a good tracking precision and a wide following range of synchronization
A mobile communication device has a delay locked loop circuit for carrying out a tracking synchronization of a reception signal. The reception signal may be a spread spectrum signal. The delay...
|
|
|
6680987 |
Fading communications channel estimation and compensation
A method for estimating and compensating for a fading communications channel includes the steps of generating matched filter data from a received data burst, interpolating between reference symbols...
|
|
|
6678312 |
Method for extending digital receiver sensitivity using analog correlation
Analog correlation techniques are used in a digital receiver portion of a spread spectrum transceiver to determine when to turn ON given digital receiver components. According to a particular...
|
|
|
6674790 |
System and method employing concatenated spreading sequences to provide data modulated spread signals having increased data rates with extended multi-path delay spread
A system and method for enabling a transmitter employing signal spreading techniques to increase the data rate of the transmitted modulated signal without reducing the multi-path delay spread....
|
|
|
6671311 |
Receiver for use in a code shift keying spread spectrum communications system
A direct sequence spread spectrum receiver for use in a communication system that utilizes code shift keying (CSK) modulation. Code shift keying modulation transmits data in the form of circularly...
|
|
|
6661831 |
OUTPUT APPARATUS, TRANSMITTER, RECEIVER, COMMUNICATIONS SYSTEM FOR OUTPUTTING, TRANSMITTING AND RECEIVING A PSEUDORANDOM NOISE SEQUENCE, AND METHODS FOR OUTPUTTING, TRANSMITTING RECEIVING PSEUDORANDOM NOISE SEQUENCES AND DATA RECORDING MEDIUM
A PN sequence output apparatus outputs a PN sequence which is generated by using a Chebyshev polynomial T(a, cos θ)=cos(a θ) for an integer a (2≦a) and which has a length N (1≦N). An...
|
|
|
6654405 |
Methods and apparatus for use in performing dot product operations for spread spectrum communications
A processing apparatus for use in spread spectrum communications includes a controller, a filter programmed in the controller, and a dot product hardware unit external from the controller having...
|
|
|
6650690 |
Device and system for carrying out search procedures in a mobile radio receiver
A device for carrying out search procedures includes a memory for storing a digital received data sequence, and a memory storing a predetermined correlation data sequence. A correlation device has...
|
|
|
6633601 |
Method and device for frame rate determination using correlation metrics and frame quality indicators
A method and device for determining a frame rate of a data fame transmitted over a variable rate communication system. In one embodiment, the present invention receives demodulated soft symbols...
|
|
|
6628699 |
Receiving a spread spectrum signal
A receiver for use in a spread spectrum communication system includes the following components: an acquisition system configured to detect a transmitted spread spectrum signal by simultaneously...
|
|
|
6625200 |
Multi-stage CDMA synchronization with parallel execution
Methods and systems for time synchronizing a receiver to a spread spectrum signal are described. Exemplary embodiments of the present invention provide for at least a two step process in which, at...
|
|
|
6621855 |
Scalable spread-spectrum signal detection and acquisition processor
A method allows determination of the presence of, the frequency of, and or the timing of a coded signal distributed in time, as for example a direct-sequence spread-spectrum signal or a signal...
|
|
|
6621854 |
Spread-spectrum electromagnetic signals
An assembly of simultaneously transmitted electrically generated signals is disclosed, which contains a subset of binary spreading-code sequences that are members of a larger set of binary...
|
|
|
6618430 |
Methods and apparatus for receiving N-chip resistant codes
The invention relates to systems and methods for receiving signals modulated with a carrier frequency, wherein the signals include spreading chip sequences having at least one zero. The invention...
|
|
|
6614835 |
Acquisition method and configuration for carrying out the method
A communications acquisition method includes a correlation of a received, coded spread sequence having a length of m bits with a locally generated spread sequence m times, in each case delayed by...
|
|
|
6606349 |
Spread spectrum receiver performance improvement
Embodiments of the invention are used to improve performance of spread spectrum communications equipment. The improvement may take the form of improved sensitivity to weak signals, quicker...
|
|
|
6603803 |
Global positioning system receiver for monitoring the satellite transmissions and for reducing the effects of multipath error on coded signals and carrier phase measurements
A Global Positioning System receiver includes an intermediate frequency (IF) processor configured to downconvert broadcast signal to generate a first channel signal which is further downconverted...
|
|
|
6603980 |
Transmitter-receiver, and method for controlling transmission power of the same
Received quality detecting section 108 detects a received quality, bit determining section 111 determines whether a TPC bit is 0 or 1, amplitude reading section 112 reads a ratio of an...
|
|
|
6600775 |
Adaptive reference pattern for spread spectrum detection claims
A receiver for detecting spread spectrum binary data particularly on a power line in the presence of channel distortion. In one embodiment a standard pattern ideally suited for minimal distortion...
|
|
|
6597726 |
Receiver including an apparatus for generating complex four-phase sequences
A receiver including an apparatus for generating complex four-phase pseudo-random code sequences which may be directly mapped to a quadrature phase shift keying (QPSK) signal constellation. The...
|
|
|
6594605 |
Correlation function measuring method and apparatus
A correlation function measuring method and apparatus can correct a correlation vector with high accuracy. The correlation function measuring apparatus includes first signal processing means 18 a ...
|
|
|
6590888 |
Cellar system, mobile portable apparatus, base station apparatus, optimum path detecting method, and apparatus thereof
A cellar system using code divisional multiple access (CDMA) system is disclosed, that comprises a plurality of finger circuits, and a search engine portion having a reception level measuring...
|
|
|
6590872 |
Receiver with parallel correlator for acquisition of spread spectrum digital transmission
A receiver of a handset transceiver, in a wireless telephone system having a plurality of wireless handset and a base unit having a base transceiver. Each handset has a handset transceiver for...
|
|
|
6587500 |
Symbol sampling time settlement of a hard decision radio receiver
A method and apparatus for improving bit error performance within a hard decision radio interface processing environment is provided, whereby a sampling unit collects a number of samples per...
|
|
|
6584142 |
Matched filter
In a matched filter, a spread data path unit holds inputted spread data, a multiplier unit multiplies an output of the spread data path unit by a spreading replica code, and an adder unit adds...
|
|
|
6584141 |
DS-CDMA system with high resolution timing
A method and apparatus for DS-CDMA communication having improved timing resolution. In the transmitter, a signal spread by a first sequence of pulses is generated with pulse shape given by p (...
|
|
|
6577686 |
Receiver
The invention aims at adaptive array diversity reception of high convergence speed of combined weight by a simple signal processing, in a receiver by time division transmission system. Signals...
|
|
|
6574205 |
CDMA cellular system and method of detecting spreading code in CDMA cellular system
A CDMA cellular system does not require accurate synchronization between all base stations and is capable of distinguishing the base stations from each other without the need for a complex process....
|
|
|
6574268 |
Asymmetric orthogonal codes for optical communications
A system ( 101-139 ) receives a transmitted optical signal and generates an orthogonal despreading code that is different than the code used to spread the transmitted signal. The system ( 101-139 )...
|
|
|
6574269 |
Asymmetric orthogonal codes for wireless system receivers with multiplication-free correlators
A method includes receiving a transmitted signal and generating an orthogonal despreading code that is different than the code used to spread the transmitted signal. The method then despreads the...
|
|
|
6570909 |
Interference suppression in a CDMA receiver
A system and method for canceling interference present in a code-division multiple access (CDMA) channel signal received at a CDMA receiver that is caused by multipath components of a transmitted...
|
|
|
6563861 |
Doppler spread estimation system
A receiving apparatus Doppler spread estimator includes a receiver receiving signals over a transmission channel that varies over time due to fading and converting the signals to digital samples...
|
|
|
6560271 |
Pseudo noise code acquisition apparatus for direct sequence spread spectrum communications
A pseudo noise code acquisition apparatus in a direct sequence spread spectrum receiver capable of minimizing a retard involved in the updating of a pseudo noise code sequence, thereby achieving a...
|
|
|
6553056 |
CDMA receiver with a reduced number of required high speed adders
A CDMA receiver with a reduced number of high speed adders is provided, wherein integration for one symbol period is performed for each value of spreading code corresponding to a particular user...
|
|
|
6553019 |
Communications system employing orthogonal frequency division multiplexing based spread sprectrum multiple access
Tone sequences in a frequency hopping arrangement are generated and assigned by advantageously employing a combination of a sequence generator and a sequence assignor to generate sequences and...
|
|
|
6549559 |
Apparatus and method for locking onto a psuedo-noise code in an IS-95 spread spectrum communications system
In response to an error signal, a pseudo-noise generator ( 312 or 416 ) generates an on-time pseudo-noise signal, an early pseudo-noise signal delayed by less than one-half of a chip interval,...
|
|
|
6549564 |
Random access in a mobile telecommunications system
For one embodiment, a Random Access Channel (RACH) preamble modulation method and apparatus are disclosed in which the real and imaginary components of a complex RACH preamble are filtered in...
|
|
|
6549565 |
Code division multiple access system and method of operation with improved signal acquisition and processing
A Code Division Multiple Access system and method of operation provides reduced interference for received signals and improved signal acquisition and processing with reduced computational...
|
|
|
6546245 |
Inverted code sequence cordless signaling
A method and apparatus to perform a signaling protocol between a base station and a remote handset of a digital cordless telephone to simplify the digital cordless telephone. A pseudo-noise (PN)...
|
|
|
6546064 |
Synchronization acquiring method synchronization acquiring apparatus
A synchronization acquiring method capable of reducing the length of time required to perform in wireless communication a synchronization acquiring operation is provided when the mobile station...
|
|
|
6546258 |
Communication apparatus and communication method
A communication apparatus for communicating with one base station among a plurality of base stations is provided with a present position detecting device for detecting a present position of the...
|
|
|
6535545 |
RF modem utilizing saw resonator and correlator and communications transceiver constructed therefrom
A bidirectional direct sequence spread spectrum half-duplex RF modem which can be applied to transmit and receive numerous types of analog and digital pulse modulation. The modem incorporates two...
|
|
|
6535546 |
Method and apparatus for determining characteristics of components of a communication channel under load
For determining characteristics of components of a communication channel, for example of a transponder in a communication satellite, a clean carrier signal f(t) is modulated with a pseudo noise...
|
|
|
6526091 |
Communication methods and apparatus based on orthogonal hadamard-based sequences having selected correlation properties
Methods and apparatus for synchronization of a transmitter and a receiver are based on orthogonal sequences having optimized correlation properties. The transmitter may generate signed versions of...
|
|
|
6526039 |
Method and system for facilitating timing of base stations in an asynchronous CDMA mobile communications system
A method and system are disclosed for facilitating the timing (e.g., the known relative timing differences) of base stations (BSs) in asynchronous CDMA mobile communications systems. A plurality of...
|
|
|
6519237 |
Apparatus and method for parallel searching and correlating for CDMA system
A method to expediently perform search/correlation operation between an internal pilot pseudonoise (PN) sequence and an incoming pilot PN sequence. This operation is used to acquire base stations...
|
|
|
6516020 |
Correlator and despreading code switching method
Despreading codes are switched at effective timings to perform despreading calculations by providing a rate difference between the first clock signal to input a spread signal to be subjected to the...
|
|
|
6507602 |
Smoothing receiver channel estimates using spectral estimation
A receiving apparatus comprises a receiver receiving signals via multiple propagation paths having different propagation delays and converting the signals to digital samples for processing. A...
|
|
|
6504883 |
Synchronous detector
A synchronous detector used in a code division multiple access (CDMA) communication receiver comprises a correlator and a pre-synchronous decision circuit. The correlator calculates a plurality of...
|
|
|
6487252 |
Wireless communication system and method for synchronization
An orthogonal frequency division multiplexed wideband communication system provides improved time and frequency synchronization by inserting an unevenly spaced pilot sequence within the...
|