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US20090323869 |
METHOD AND APPARATUS FOR SPACE DIVISION MULTIPLE ACCESS RECEIVER
Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different...
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US20090323868 |
Selection of a Received Sequence By Means of Metrics
A method of received data sequence assessment, the method comprising producing a correlation metric describing the fit to a received sequence of the most likely of a set of candidates for the...
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US20090323867 |
Adaptive synchronization enhancement technique for serial modulated waveforms
Methods and apparatus for synchronization (SYNC) detection of a received serial offset quadrature pulse shaped waveform modulated by a symbol SYNC sequence are provided. The waveform is serially...
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US20090316757 |
SYSTEM AND METHOD USING HIGH PERFORMANCE PREAMBLE COVER SEQUENCES FOR MULTI-BAND OFDM TWO-BAND HOPPING MODES
Methods and systems for packet preamble sequences are provided. The preamble sequences are produce by multiplying preestablished base sequences by cover sequences. The cover sequences are chosen...
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US20090316817 |
CHANNEL ESTIMATION FOR WIRELESS SYSTEMS WITHOUT MATRIX INVERSION
In various embodiments, techniques are provided to determine channel characteristics of various communication systems such as OFDM systems or systems using a plurality of transmit antennas by using...
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US20090316634 |
Frame Synchronization Method of OFDM Communication System and Receiver Therefor
Provided are a new frame synchronization method, which is capable of shortening the time necessary for frame synchronization between a receiver and a base station of PHS based on an OFDM...
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US20090310653 |
HYBRID POLYPHASE AND JOINT TIME-FREQUENCY DETECTION
A demodulator ( 150 ) in a receiver ( 100 ) includes a correlator ( 240 ) for de-spreading a spread-spectrum signal, and decision module ( 250 ) for detecting a preamble and for synchronizing to...
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US20090310706 |
Transmitter and Receiver Using Pseudo-Orthogonal Code
A transmitter using pseudo-orthogonal code includes a serial-to-parallel converter for converting serial transmission data into 9-bit parallel data, and a pseudo-orthogonal code memory for...
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US20090304128 |
Packet Detection Apparatus and Method, Wireless Communication Apparatus and Method, and Computer Program
A packet detection apparatus detects a packet from a received signal by using a preamble containing an established, repeating training sequence. A first autocorrelation calculator computes a first...
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US20090304127 |
NARROW BAND RECEIVER
An RF receiver comprises a signal processor arranged to perform a method of decoding data contained within a signal that comprises a set of slots, at least one said slot comprising a preamble...
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US20090304126 |
OFDM Communication Device and Guard Interval Length Decision Method
Even if background noise is present, it is possible to control a guard interval length so that a minimum required SINR can be obtained. An OFDM communication device ( 10 ) includes: a correlation...
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US20090304051 |
METHOD AND APPARATUS FOR REDUCING THE TIME REQUIRED TO ACQUIRE A GPS SIGNAL
A method of correlating a digital communications signal is described. In an example, a window is defined equal to a portion of an epoch of the digital communication signal. The digital...
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US20090296862 |
RECEIVING APPARATUS AND RECEIVING METHOD
A receiving apparatus that can properly determine the position of an effective symbol included in a received signal is provided. A receiver acquires a signal from a sending apparatus that transmits...
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US20090290661 |
DETECTION OF TIME-DOMAIN SEQUENCES SENT ON A SHARED CONTROL CHANNEL
Techniques for sending and receiving signaling messages in a control segment are described. The control segment may be sent with CDM in multiple OFDM symbols. At a receiver, a received sequence is...
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US20090290662 |
METHOD FOR GENERATING A REFERENCE SIGNAL SEQUENCE USING GROUPING
Method for generating reference signal sequence using grouping is explained. In this method, base sequences are grouped such that each group contains at least one base sequence of each length, so...
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US20090285339 |
Apparatus for Generating Spreading Sequences and Determining Correlation
An apparatus includes a signal generator to output one of a first sequence or a second sequence and to augment sequences with cover codes, such that a sum of out-of-phase aperiodic autocorrelation...
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US20090285338 |
BANK OF CORRELATORS FOR SETS OF GCL SEQUENCES
A method for correlation of an input signal in a receiver is disclosed as well as a receiver and a communication system for implementing the method. The input signal is correlated with Generalized...
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US20090285319 |
Efficient Physical Layer Preamble Format
A method for generating a preamble of a data unit for transmission via a communication channel includes generating a first field of the preamble using one of a first sequence or a second sequence,...
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US20090285337 |
FREQUENCY DOMAIN ROOT CAZAC SEQUENCE GENERATOR
The present invention provides a method for implementation in a random access channel receiver. One embodiment of the method includes generating at least one frequency domain reference sequence by...
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US20090279646 |
Wireless communication device
A wireless communication device is provided to carry out correlation peak detection processing properly and efficiently in intermittent receiving unit. If a correlation peak is not detected in a...
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US20090268789 |
LOW I/O BANDWIDTH METHOD AND SYSTEM FOR IMPLEMENTING DETECTION AND IDENTIFICATION OF SCRAMBLING CODES
A system for detecting and identifying the identity of a base station or cell which transmits a scrambling code is provided. According to one aspect of the system, the system is used to perform...
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US20090268856 |
DEMODULATION DEVICE, DEMODULATION DEVICE CONTROL METHOD, DEMODULATION DEVICE CONTROL PROGRAM, AND RECORDING MEDIUM WITH RECORDED DEMODULATION DEVICE CONTROL PROGRAM
This demodulation device receives and demodulates a digital broadcast wave. This demodulation device includes an RF search control unit ( 41 ) and a GI search control unit ( 42 ). The RF search...
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US20090268855 |
SIGNAL RECEIVING APPARATUS, SIGNAL RECEIVING METHOD AND SIGNAL RECEIVING PROGRAM
A signal receiving apparatus for receiving signals is provided. The signal receiving apparatus includes a correlation-value computation section configured to sequentially compute a correlation...
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US20090262870 |
TUNING SYSTEM AND METHOD USING A SIMULATED BIT ERROR RATE FOR USE IN AN ELECTRONIC DISPERSION COMPENSATOR
A system and method is disclosed for controlling signal conditioning parameters and a sampling parameter controlling conversion of a received signal to digital sampled values prior to decoding. The...
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US20090257532 |
Determining Burst Transmission Signals
Described are computer-based methods and apparatuses, including computer program products, for determining burst transmission signals. A receiver receives radio frequency data from a data source...
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US20090257528 |
QUADRATURE MODULATION WITHOUT CARRIER
Transmitters, receivers and associated methods are disclosed for providing phase and amplitude modulation in a carrier-less communication system (e.g., an ultra-wide band communication system). An...
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US20090252260 |
METHOD FOR GENERATING A REFERENCE SIGNAL SEQUENCE USING GROUPING
Method for generating reference signal sequence using grouping is explained. In this method, base sequences are grouped such that each group contains at least one base sequence of each length, so...
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US20090252261 |
System, Apparatus, and Method for Processing a Received Orthogonal Frequency Division Multiplexing Signal
A wireless communication system, an apparatus and a method for processing a received OFDM signal is provided. The wireless communication system comprises an interface and a processing apparatus....
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US20090245436 |
Systems and Methods For Sending An Acknowledgement Message In A Wireless Communication System
A method for sending an acknowledgment message in a wireless communication system is disclosed. A first signal is received before receiving a second signal from a transmitter. Decoded first data is...
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US20090232231 |
Frequency estimation
For estimating a difference between a frequency of a base station and a locally generated frequency of a mobile equipment in a mobile communications network, wherein at least a signal in a...
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US20090232258 |
DEVICE AND METHOD FOR DEMODULATING CONTROL SIGNALS
A device performs demodulation of control signals from multiple radio terminals, based on the correlations in the frequency domain between a predetermined code and the orthogonalized control...
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US20090225908 |
PATTERN DETECTION CIRCUIT, BASE STATION AND MOBILE COMMUNICATION SYSTEM USING THE SAME, AND PATTERN DETECTING METHOD
A pattern detection circuit for performing pattern detection on input signals from a communication terminal, includes a frequency domain transformer that transforms input signals into frequency...
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US20090225910 |
RADIO COMMUNICATION SYSTEM, RECEIVER, RECEIVING METHOD, TRANSMITTER, TRANSMITTING METHOD, AND DEVICE FOR AND METHOD OF CALCULATING DELAY TIMES FOR MULTI-CARRIER TRANSMISSION
Multi-carrier transmission is performed without inserting a repetitive signal into guard interval periods. A transmitter provides guard interval periods by using a null signal to save transmission...
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US20090225909 |
Corrleator for Tracking Satellite Signal
A correlation apparatus for tracking a satellite signal includes a shifter, a multiplexer and an accumulator. The shifter generates generating a Prompt signal, a plurality of Early signals and a...
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US20090220035 |
APPARATUS FOR EQUALIZING CHANNEL IN FREQUENCY DOMAIN AND METHOD THEREFOR
Provided is an apparatus for channel equalization in frequency domain, including: a channel estimation unit for estimating a channel on received signal from outside, a channel matched filter for...
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US20090213922 |
Method and Apparatus for Efficient Multi-Symbol Detection
Where two or more multi-valued digital data symbols are modulated so that they overlap after passing through a channel, forming a combined signal, a receiver receives the combined signal and forms...
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US20090213968 |
Method and apparatus to detect random access channel preamble
A method (and operation of a computer program) includes receiving a signal over a wireless channel; correlating the received signal with a reference sequence and providing a correlation output;...
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US20090213947 |
BLOCK BOUNDARY DETECTION FOR A WIRELESS COMMUNICATION SYSTEM
Method and apparatus for block boundary detection is described. A signal is received. The signal is quantized to provide a quantized signal to at least one correlator, the quantized signal being a...
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US20090213969 |
Wireless Communication Device, Equalizer, Computer-Readable Medium Storing Program for Obtaining Weight Coefficients in the Equalizer, and Process for Obtaining Weight Coefficients in the Equalizer
In an equalizer arranged in a wireless communication device: information on correlation in one or more first wireless signals is generated; a channel vector is generated on the basis of the one or...
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US20090207949 |
TRANSMITTER IDENTIFICATION INFORMATION SIGNAL DETECTION APPARATUS AND METHOD
A transmitter identification information (TII) signal detection circuit is suitable for an orthogonal frequency division modulation system. A TII signal detection circuit receives a TII signal and...
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US20090207950 |
MODULATION SCHEME ESTIMATION APPARATUS AND METHOD
A modulation scheme estimation apparatus includes a receiving unit receiving a first signal, a generation unit generating a plurality of first phase amounts, an acquisition unit acquiring a...
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US20090207885 |
Delay estimation apparatus and method
Delay estimation apparatus and method, comprising: a correlation step which a correlation function between a received signal and a supplied template waveform is generated, AD conversion step at...
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US20090207951 |
Apparatus and Method for Processing Signal Using Single Correlator
An apparatus and method for processing a signal using a single correlator are provided. The apparatus may include a first storage unit storing satellite signal samples, a correlator receiving the...
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US20090207944 |
COMMUNICATIONS DEVICE AND RELATED METHOD THAT DETECTS SYMBOL TIMING
A communications device includes a signal input for receiving signals such as a binary phase shift keyed (BPSK) communications signal having a repeated preamble bit or symbol pattern. A modem...
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US20090207891 |
MULTIPATH DETECTION FOR RECEIVED SPS SIGNAL
The subject matter disclosed herein relates to detecting and/or estimating multipath signals. For an example, a signal comprising at least one binary offset carrier (BOC) modulation signal is...
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US20090196383 |
CORRELATION APPARATUS AND METHOD FOR FREQUENCY SYNCHRONIZATION IN BROADBAND WIRELESS ACCESS COMMUNICATION SYSTEM
A correlation apparatus and method for frequency synchronization are provided. A frequency synchronization method of a receiver in a broadband wireless access communication system includes...
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US20090185645 |
Receiver Device, Error Detection Circuit, and Receiving Method
A receiver device which is small in scale of circuit configuration yet capable of detecting an error between symbol timing of a received signal and that generated therein and also restraining an...
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US20090185646 |
ESTIMATING FREQUENCY SHIFT
Techniques, systems and apparatus are described for estimating a frequency shift. An apparatus for estimating a frequency shift includes a fast Fourier transform unit to transform a signal of a...
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US20090185634 |
RADIO COMMUNICATION SYSTEM, RADIO COMMUNICATION DEVICE, AND CHANNEL CORRELATION MATRIX DECISION METHOD
It is possible to prevent lowering of a throughput of a radio communication system even when propagation path environments of an uplink line and downlink line are asymmetric. A maximum proper value...
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US20090175299 |
SIGNAL DETECTION DEVICE AND SIGNAL DETECTION METHOD
A correlation unit ( 32 ) sequentially obtains correlation values between a baseband signal and a reference signal and outputs the obtained reference signal to a section division unit ( 33 ). The...
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