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7392018 |
Channel estimation applique for wireless communications
A test signal generator at a transmitter station and a facsimile generator at a receiver station go through an acquisition and tracking process which aligns the two signals, removing errors in the...
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7363009 |
Method and apparatus for determining propagation delays for use in wide area networks
A system and method for determining a signal propagation delay between a transmitter and a receiver, and for adjusting a transmission time based on the propagation delay. A central station inserts...
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7342986 |
Digital PLL device
A phase-locked-loop device includes a clock generator for generating a reference clock based on a binarized playback signal and a frequency of run-length data and for generating N-phase clocks...
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7321579 |
Method for analyzing data transmission throughput in a wireless LAN
A method is provided for analyzing data transmission throughput in a wireless LAN of a multi sector environment. The method may include determining a sum of symbols of all sector switch guard times...
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7319686 |
Frame synchronization in multi-cell systems with a data interface
A method of timing in a multi-cell system requiring synchronization of frames in transmission is provided. Transceivers of a wired data interface between a central controller and multiple base...
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7315728 |
Polarized wave measuring apparatus, and antenna characteristic measuring apparatus and radio wave measuring apparatus using the same
A phase shift section phase-shifts the second band-restricted signal to a first phase-shifted signal and a second phase-shifted signal having a phase that is different from the phase of the first...
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7299013 |
Apparatus and method for correcting doppler shift in mobile communication systems
A system and method for correcting for Doppler shift in transmitted and received electromagnetic wave, light wave, or acoustic wave signals between two platforms, where at least one of the...
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7299012 |
Circuit to add and subtract two differential signals
An electrical circuit to add and subtract differential input signals may be implemented using distributed differential transmission lines having a length substantially equal to one quarter of a...
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7286802 |
Wireless simulator
There is disclosed a simulator for mobile terminals within the context of a wireless network, for the purpose of testing the basestations. Channel impairments are effect during baseband processing.
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7269387 |
Method and apparatus for determining a distance between a base station and a mobile unit
The present invention provides a method and an apparatus for detecting at least one repeater between a base station and a mobile unit. The method includes determining a first estimate of a distance...
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7260168 |
Network measurement method and apparatus
The apparatus measures timing variations, such as the jitter or wander in a timing signal ( 100 ) of a telecommunications network. A recovered clock signal is sampled and digitized to produce a...
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7254402 |
GPS satellite signal acquisition assistance system and method in a wireless communications network
A system and method for assisting an integrated GPS/wireless terminal unit in acquiring one or more GPS satellite signals from the GPS satellite constellation. The invention includes a method for...
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7245879 |
Apparatus and associated methods to perform intelligent transmit power control with subcarrier puncturing
An apparatus and associated methods to perform intelligent transmit power control with subcarrier puncturing in a multicarrier wireless communication channel is generally disclosed.
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7239849 |
Adaptive communication methods and apparatus
Possible deficiencies of a communication link are detected and automatically counteracted, at least to some degree. The deficiencies addressed can include phase shift and attenuation compensation....
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7236750 |
Techniques for correcting for phase and amplitude offsets in a MIMO radio device
Techniques to correct for phase and amplitude mismatches in a radio device in order to maintain channel symmetry when communicating with another device using MIMO radio communication techniques....
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7231184 |
Low overhead transmit channel estimation
A transmit channel (g t1 , h, g r2 ) through which a first wireless communication transceiver is to transmit to a second wireless communication transceiver can be estimated using information...
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7224942 |
Communications system employing non-polluting pilot codes
Transmitting non-polluting dummy pilot signals in a wireless communication network permits estimation of the downlink propagation channels between a number of joint transmitters and a lesser number...
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7221913 |
Effective time-of-arrival estimation algorithm for multipath environment
An algorithm identifies a line-of-sight (LOS) signal that may be used to provide an effective time-of-arrival (TOA) estimation.
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7218939 |
Estimation of a signal delay
The invention relates to a method for estimating a delay of a signal received at a mobile station MS from a specific network element BS 1 , BS 2 of a network for determining the location of the...
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7215971 |
Method and apparatus for compensation of Doppler induced error in a mobile handset
A method and apparatus for correcting for Doppler shift in GSM signals at a mobile handset in communication with a base station is provided. The rate of change of position of the mobile unit is...
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7213257 |
Determining phase linearity in CATV distribution systems
An apparatus for testing the phase linearity of a network comprises a first local oscillator, a first mixer, and a first filter, a second local oscillator, and a second mixer for mixing the first...
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7203462 |
Antenna unit and radio base station therewith
Phase and amplitude deviations, which are generated, for example, by cables connecting an array antenna of a CDMA base station and the base station, are calibrated in the baseband. The base...
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7200414 |
Client-aiding with cellphones in a 150-KM radius area
A cellphone system comprises a GPS reference station located with a telephone cell site. Such GPS reference station tracks the GPS satellites visible to its local area and estimates the Doppler for...
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7184714 |
Frequency domain estimation of IQ imbalance in a wireless OFDM direct conversion receiver using loopback connection
An OFDM transceiver has a transmitter, a receiver, and a loopback switch. The loopback switch configured is for selectively establishing a physical connection between an output terminal of the...
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7184712 |
System and method for improving the quality of range measurement based upon historical data
A system and method for applying an algorithm to distance measurements between nodes in an ad-hoc communications network ( 100 ). The algorithm is located at an individual node ( 102, 106, 107 ) of...
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7184708 |
Interference mitigation by adjustment of interconnect transmission characteristics
Interference within a wireless apparatus is mitigated by adjusting one or more transmission characteristics associated with an interconnect of the apparatus. In at least one embodiment, the...
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7181205 |
I/Q calibration
The amplitude and phase errors of the modulation and demodulation in a transceiver are corrected by a self-calibration procedure in which a test signal is applied to the baseband input of the...
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7174133 |
Systems and methods for determining the delay offsets of communication systems
Methods for determining delay offsets of communication systems are provided. One such method comprises: determining components of a propagation path of a base station of a communication network;...
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7171164 |
Method of estimating downlink channel, and user equipment
The invention relates to a method of estimating a downlink channel in a radio system, and user equipment in a radio system. The user equipment is configured to form an impulse response for a common...
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7164737 |
Method for estimating doppler frequency
Disclosed is a method for estimating a Doppler frequency with phase information, thereby estimating a maximum Doppler frequency. The method for estimating the Doppler frequency includes the steps...
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7164725 |
Method and apparatus for antenna array beamforming
An antenna array beamforming technique employs independent transmit weighting coefficients for multiple subscriber units served by a transmitting communication device. Optimization of the weighting...
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7155171 |
Vector network analyzer applique for adaptive communications in wireless networks
A test signal generator at a transmitter station and a facsimile generator at a receiver station go through an acquisition and tracking process which aligns the two signals so that a logical...
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7139581 |
Method and system for distance measurement in a low or zero intermediate frequency half-duplex communications loop
A method and system for distance measurement in a low or zero intermediate frequency (IF) half-duplex communications loop measures the distance between two transceivers without synchronizing the...
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7139579 |
Relay and communication system
This invention relates to a wireless LAN access point including a communication unit capable of communication by the first wireless communication method, a unit which detects that the traffic...
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7130601 |
Determination of received signal strength in a direct conversion receiver
Determination of a received signal strength indication in a direct conversion receiver begins by determining, at a given time, a 1 st value to be the larger of the in-phase component of the...
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7123943 |
Method of generating directional antenna beams, and radio transmitter
A method of forming directional antenna beams, comprising: directing at least two antenna beam signals by means of a beam formation matrix and pre-phasing pre-determined antenna beam signals formed...
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7116998 |
Subtractive multipath delay detection
In a RAKE receiver delays associated with multipath signals are determined by subtracting power values associated with sidelobes of a peak value for each of the multipath signals. The determination...
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7113807 |
Base station and method for receiving and processing signal in the base station
Disclosed is a method for simplifying a signal processing process of a base station that receives signals through four branches using two two-branch polarized antennas for each sector. The base...
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7099640 |
Method distinguishing line of sight (LOS) from non-line of sight (NLOS) in CDMA mobile communication system
The invention discloses a method that identifies whether a channel is LOS or NLOS in a mobile communication system. After coherent accumulation and non-coherent accumulation have been made by the...
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7095993 |
Frequency auto-correction apparatus for CDMA multipath fading channel
An automatic frequency correction (AFC) apparatus used for CDMA multipath fading channels comprises a frequency-offset evaluator, an automatic frequency correction loop filter and a carrier...
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7095984 |
Base station apparatus and direction-of-arrival estimating method
Signals including a plurality of components representing a phase rotation between antenna elements by combining signals, which have arrived through each path of a first to an m-th paths, for every...
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7092706 |
Apparatus and method for signal strength compensation of highly time-variant mobile radio channels and reception unit for mobile radio transmission
A signal strength compensation unit for mobile radio receivers is connected upstream of the channel estimator and the channel equalizer and compensates for, in particular, the great, brief signal...
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7085327 |
Phasor fragmentation circuitry and method for processing modulated signals having non-constant envelopes
An improvement for a phasor fragmentation engine and method, whereby a phasor flipping algorithm is applied when determining fragment phasors for a non-constant envelope modulation signal (e.g....
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7085240 |
Directed maximum ratio combining and scheduling of high rate transmission for data networks
Disclosed are systems and methods which proactively determine particular access terminals which are compatible for simultaneous communication at a high data rate and preferred embodiments provide...
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7079514 |
Mobile communication apparatus with antenna array and mobile communication method thereof
A mobile communication apparatus with an antenna array and a mobile communication method therefore, wherein the apparatus includes a base station with an antenna array and a mobile station, wherein...
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7072618 |
Adaptive threshold selection system and method for detection of a signal in the presence of interference
A system and method for providing adaptive threshold selection for detecting a signal in the presence of interference or noise. The system and method thus enables a node, such as a mobile user...
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7058399 |
Search window delay tracking in code division multiple access communication systems
The present invention provides a search window delay tracking procedure for use in a multipath search processor of a CDMA radio receiver. A channel impulse response is estimated for a received...
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7046965 |
Radio receiver and receiving method for controlling the beam-width of an antenna
A radio receiver is provided with a beam-width-variable antenna that receives a radio signal and is capable of changing the beam-width; an interference canceler for removing interference waves from...
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7046962 |
System and method for improving the quality of range measurement based upon historical data
A system and method for applying an algorithm to distance measurements between nodes in an ad-hoc communications network. The algorithm is located at an individual node of the ad-hoc network and...
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7043275 |
Radio communication apparatus using adaptive antenna
In a radio communication apparatus, delay profiles of a desired wave and delay waves thereof are estimated by plural delay profile estimation sections for each of received signals from directional...
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