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| Number | Title | Issue Date |
| 8189719 | 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 obtained for the control segment. A time-domain signaling sequence is... | 05/29/2012 |
| 8175197 | Preamble detection with unknown channel A system includes a correlation module and a control module. The correlation module is configured to generate correlation values based on a correlation of modulated signals with a plurality of preamble sequences and generate correlation values. The modulated signals... | 05/08/2012 |
| 8175198 | Matched filter and receiver A matched filter and receiver is provided to delete the tap coefficients of a matched filter used in an OFDM receiver. In the matched filter and receiver, a transmitting signal is generated by using a symmetric series (Y) obtained from C[k]=exp[j*π*M/N*(k+0.5)^2], ... | 05/08/2012 |
| 8155250 | Receiver with frequency offset compensation for M-state phase modulation Method and apparatus for a wireless receiver are described which derive at least a first stream of first digitized samples from a received analog signal at a first sampling rate and identify a first frequency offset based on a plurality of parallel correlations usin... | 04/10/2012 |
| 8155251 | Detection of access bursts in a random access channel A technique for detecting one or more access bursts (112) in a random access channel (110) is described. Each access burst includes a transmission preamble, the transmission preamble being a member of a preamble set including sequences of preamble symb... | 04/10/2012 |
| 8149962 | 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 time domain into a frequency domain and output fast Fourier transform sy... | 04/03/2012 |
| 8149961 | Ranging in multi-band communication systems System and methods include transmitting the same signal in all sub-bands in different time intervals and processing the corresponding received signals to achieve a time resolution proportional to the inverse of the whole bandwidth as opposed to that of a single sub-... | 04/03/2012 |
| 8149960 | Channel estimation for frequency selective multipath channels with long delay spreads based on an assumed physical channel A channel impulse response is determined for a channel by receiving a signal from the channel, and by determining a least squares estimate of the channel impulse response. The received signal contains a training sequence and unknown data. The least squares estimate ... | 04/03/2012 |
| 8144818 | Apparatus and methods for determining timing in a communication system Apparatus and methods for use in a wireless communication system are disclosed for determining a timing position for channel activity in order to resolve timing ambiguity. A disclosed apparatus includes a processor that determines when channel activity occurs in at ... | 03/27/2012 |
| 8144820 | System and method for relative phase shift keying Disclosed are various embodiments of systems and methods for relative phase shift keying. In one embodiment, an analog waveform is converted to digital signals. A specified frequency range is isolated and the magnitudes of tones corresponding to a channel are measur... | 03/27/2012 |
| 8144819 | Synchronization for chirp sequences Methods and apparatus for identifying correct peaks in outputs of matched filters in user equipment for communication systems are provided. A received signal is correlated with a replica of a synchronization signal, thereby producing a correlation output signal. Pea... | 03/27/2012 |
| 8139692 | Code evaluator, code evaluation method, radio communication system, base station and mobile station The present invention relates to a code evaluation method comprising the steps of computing an auto-correlation function from a generated code; computing an evaluation reference value for determining quality of the generated code based on the auto-correlation functi... | 03/20/2012 |
| 8139691 | Apparatus and method for selecting correlation scheme based on carrier frequency error Provided is a correlation scheme selecting apparatus and method that can acquire initial synchronization efficiently by calculating frequency error criterion threshold between correlation schemes and selecting a correlation scheme for each region when a correlation ... | 03/20/2012 |
| 8135096 | Method and system for the extension of frequency offset estimation range based on correlation of complex sequences Aspects of a method and system for the extension of frequency offset estimation range based on correlation of complex sequences may include partitioning each of a received sample sequence and a local replica sample sequence into three or more similar length contiguo... | 03/13/2012 |
| 8126092 | Multistage PN code acquisition circuit and method A circuit for detecting a serial signal comprises a first circuit coupled to receive the serial signal during a predetermined plurality of time periods of substantially equal duration. The first circuit is coupled to receive a first code. The first circuit is arrang... | 02/28/2012 |
| 8121228 | Detecting a data frame A detector (109) and corresponding method is configured for detecting presence of a data frame. The detector includes a first correlator (123) that is configured to provide a first plurality of correlations corresponding to similarity between data as r... | 02/21/2012 |
| 8121229 | Guard section length detection method and system A guard section length detection method detects whether a preamble signal is received. A short preamble boundary is then detected, then detecting a frame boundary and detecting a guard section length. In the step of detecting the guard section length a second matche... | 02/21/2012 |
| 8116412 | Modulation division multiple access The present invention employs hierarchical modulation to simultaneously transmit information on different modulation layers using a carrier RF signal. Initially, first data to be transmitted is assigned to a first modulation layer and second data is assigned to a se... | 02/14/2012 |
| 8107564 | Device for detecting a frequency offset A device detects a frequency offset by a frequency converter arranged to convert a received signal into a sideband and comprises a calculator arranged to calculate a characteristic quantity of the sideband which is a measure of the frequency offset. ... | 01/31/2012 |
| 8102952 | Method for interference control by an ultra-wideband wireless communication system in a multi-user environment and a receiver for performing the same An Ultra-Wideband (UWB) wireless communication system in a multi-user environment determines a threshold value to eliminate a signal pulse affected by a near-interference from among a plurality of signal pulses transmitted a number of times. A method for controlling... | 01/24/2012 |
| 8094758 | Ephemeris download from weak signals The present invention provides systems and methods for downloading navigation data to a satellite receiver under weak signal conditions. In an embodiment, the receiver uses a tracking algorithm to estimate the Doppler frequency and rate of change of the Doppler freq... | 01/10/2012 |
| 8073084 | Correlation apparatus and method for accommodating spreading code frequency offset An apparatus and method for correlating a signal over a correlation interval while accommodating spreading code frequency offset is described. In one embodiment, the apparatus includes a plurality of correlators, where each correlator forms a correlation result corr... | 12/06/2011 |
| 8064550 | Quadrature imbalance estimation using unbiased training sequences A system and method are provided for removing quadrature imbalance errors in received data. The method accepts an unbiased training sequence in a quadrature demodulation receiver. An unbiased training sequence has a uniform accumulated power evenly distributed in a ... | 11/22/2011 |
| 8064551 | 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 through a network. The receiver converts the radio frequency data to di... | 11/22/2011 |
| 8064552 | Adaptive correlation A method is provided for correlating samples of a received signal and samples of an internally generated/stored sample sequence (“IGSSS”). The method involves performing a first iteration of a first-resolution correlation state. The first-resolution correlation ... | 11/22/2011 |
| 8059765 | Method and apparatus to detect random access channel preamble A method (and operation of a computer program and an apparatus) includes receiving a signal over a wireless channel; correlating the received signal with a reference sequence and providing a correlation output; processing the correlation output to detect a presence ... | 11/15/2011 |
| 8054918 | Wireless communication system and method with frequency burst acquisition feature using autocorrelation A wireless communication system is provided that detects a frequency burst (FB) through analysis of the autocorrelation function of received signals. The system can accommodate the relatively large frequency offsets that are associated with less expensive reference ... | 11/08/2011 |
| 8054919 | Method and apparatus for generating training sequence codes in a communication system A method and apparatus for generating training sequence codes in a communication system. In the method, a pair of sequences A and B having cross-correlation properties as well as autocorrelation properties are generated, and protection sequences A′ and B′ are ge... | 11/08/2011 |
| 8050364 | Digital signal receiving apparatus A digital signal receiving apparatus includes: detection-judging portion judging a possible presence of a desired signal when a signal level of a smoothed signal is greater than a reference level; wherein said first smoothed signal and said second smoothed signal ar... | 11/01/2011 |
| 8045655 | Apparatus and method for signal detection in a cognitive radio-based wireless communication system An apparatus and method for signal detection in a CR-based wireless communication system are provided. In the signal detection apparatus, a cyclic power calculator calculates the power spectral density of a cyclo-stationary and periodical signal to be detected with ... | 10/25/2011 |
| 8031815 | System and method for acquisition of signals A system for processing a received signal having at least one code applied thereto, the received signal having a frequency, the system comprising: first correlator circuitry arranged to correlate the received signal with a first code to provide an output; second cor... | 10/04/2011 |
| 8031816 | Method and apparatus for determining boundaries of information elements A method for determining boundaries of information elements for a PRN code modulated signal is provided. The method of the present invention measures a symbol phase of the received signal and correlation values of different durations to determine the information ele... | 10/04/2011 |
| 8031817 | 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 error signal from varying due to variation in input level of the receiv... | 10/04/2011 |
| 8027413 | Ultratight coupling prefilter detection block An observation lock detector block receives I&Q correlations and generates error measurement vectors, each including phase, frequency, code, pseudorange, and covariance residual estimates, and generates validity indicator and confidence indicator vectors, one of whi... | 09/27/2011 |
| 8019026 | Downlink preamble processing techniques for initial acquisition An apparatus, system, method, and article for downlink (DL) preamble processing for initial acquisition are described. The apparatus may include an autocorrelator node to determine an autocorrelation response of samples and to detect a downlink preamble based on the... | 09/13/2011 |
| 8019025 | Training sequence for wireless communication system Disclosed is a system and a training sequence setting method for performing frame synchronization in a wireless communication system. A received signal is affected by a frequency offset due to an oscillator mismatch between the transmitter and the receiver, which is... | 09/13/2011 |
| 8014474 | Method and RFID reader for detecting a delimiter pattern in a signal stream A method for detecting a delimiter pattern (SOF) in a signal stream containing a carrier or subcarrier modulated by the delimiter pattern comprises: specifying an expected delimiter occurrence time (t1) of an occurrence of the delimiter pattern and a toleranc... | 09/06/2011 |
| 8009774 | Devices for carrier recovery and related methods Devices for carrier recovery and related methods are provided. A receiving signal is provided to perform an interpolation filtering process and a frequency multiplication sampling process. The receiving signal is then processed with a dealing signal. The dealing sig... | 08/30/2011 |
| 8005171 | Systems and method for generating a common preamble for use in a wireless communication system A UWB system comprising a plurality of piconets, wherein each piconet uses a different code to generate a preamble for use in communicating with a plurality of remote communication devices. The preamble can be generated from the combination of repeated versions of t... | 08/23/2011 |
| 8005173 | Coarse frequency offset estimation for digital multimedia broadcasting A method of estimating a coarse frequency offset of Digital Multimedia Broadcasting (DMB) transmission frames includes receiving the DMB transmission frames including a synchronization channel having a phase reference symbol, circularly shifting the phase reference ... | 08/23/2011 |
