Patent application number | Description | Published |
20100202494 | ULTRA WIDEBAND MODULATION FOR BODY AREA NETWORKS - A symbol modulation system applicable to a body area network is disclosed herein. The symbol modulation system includes a symbol mapper. The symbol mapper is configured to determine a time within a predetermined symbol transmission interval at which a transmission representative of the symbol will occur. The time is determined based on a value of a symbol and a value of a time-hopping sequence. The time is selected from a plurality of symbol value based time slots, and a plurality of time-hopping sequence sub-time-slots within each symbol value based time slot. The symbol mapper is configured to generate a single guard interval within the symbol transmission interval. The single guard interval is positioned to terminate the symbol transmission interval. | 08-12-2010 |
20100246639 | TIME-HOPPING SEQUENCE FOR BURST MODE COMMUNICATIONS - A method consisting of determining, by a symbol mapper, whether a previous burst position is below a threshold, wherein the previous burst position defines a location within a previous symbol. A determination that the previous burst position is below the threshold causes generating, by the symbol mapper, a random number in a complete set, the random number defines a current burst position, the current burst position defines a location within a current symbol and sending or receiving a value in the current burst position. A determination that the previous burst position is above the threshold causes generating, by the symbol mapper, a random number in a reduced set, the random number defines a modified current burst position, the modified current burst position defines a location within the current symbol and sending or receiving a value in the modified current burst position. | 09-30-2010 |
20100260162 | PHY LAYER PARAMETERS FOR BODY AREA NETWORK (BAN) DEVICES - In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment based on a constant symbol rate for BAN packet transmissions and based on M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK modulation. The PHY layer is configured to transmit and receive data in a frequency band selected from the group consisting of: 402-405 MHz, 420-450 MHz, 863-870 MHz, 902-928 MHz, 950-956 MHz, 2360-2400 MHz, and 2400-2483.5 MHz. | 10-14-2010 |
20100260232 | FREQUENCY-HOPPING SCHEME - A method comprises generating, by logic, a random number. The method also comprises determining a next frequency in said sequence using the random number and one or more of a minimum separation, a channel number, and a number of channels. The method further comprises hopping to the next frequency. | 10-14-2010 |
20100260236 | PHY LAYER PPDU CONSTRUCTION FOR BODY AREA NETWORK (BAN) DEVICES - In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment based on a constant symbol rate for BAN packet transmissions and based on M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK modulation. The PHY layer is configured to construct a physical-layer service data unit (PSDU) based on a concatenate block, an insert shortened bits block, a Bose, Ray-Chaudhuri, Hocquenghem (BCH) encoder, a remove shortened bits block, an add pad bits block, a spreader, a bit interleaver, a scrambler, and a symbol mapper. | 10-14-2010 |
20100261429 | PHY LAYER OPTIONS FOR BODY AREA NETWORK (BAN) DEVICES - In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment using M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK. Also, the PHY layer uses a constant symbol rate for BAN packet transmissions. | 10-14-2010 |
20110069707 | PACKET DETECTION AND COARSE SYMBOL TIMING FOR ROTATED DIFFERENTIAL M-ARY PSK MODULATED PREAMBLE SIGNAL - A packet detection and coarse symbol timing recovery system for preamble signal modulated with rotated differential M-ary phase shift key (PSK) modulation includes a differential detection unit, to provide a symbol signal responsive to a received signal. A preamble sequence correlator performs a preamble sequence correlation on the symbol signal to produce a correlator signal. A metric calculation unit performs a metric calculation on the correlator signal to produce a metric. A packet detection unit determines that a packet is detected and produces a sample index. A coarse symbol timing unit finds a peak of the calculated metric signal outputs a sample index for the peak as coarse symbol timing information. The sample indexes are used in processing a physical layer convergence procedure (PLCP) header and physical layer service data unit (PSDU) block. | 03-24-2011 |
20110134842 | Address Space Partitioning and Filtering for Discretionary Wireless Connection Response - A system and method for providing wireless communications between a medical controller hub and an implant node are disclosed. The hub transmits signals to facilitate communication connections with the node. The signals include connection invitation polls with identification parameters. A node monitors the hub's transmissions for the connection invitation polls. When a poll is detected, the node compares the identification parameters to a list of preferred identification values. If the received identification parameter is on the preferred list, and the node and hub are not already connected, then the node responds to the connection invitation poll. If the received identification parameter is not on the preferred list, then the node continues to monitor hub transmissions for other connection invitation polls that include identification parameters that are on the preferred list. | 06-09-2011 |
20110156954 | Position and Velocity Uncertainty Metrics in GNSS Receivers - A GNSS navigation system and navigation method for determining user position, user velocity, and improved uncertainty metrics for position and velocity. A measurement engine in an applications processor of the system determines pseudorange and delta range values over each time period for each received satellite signal, and also determines measurement noise variances for both pseudorange and delta range for the individual signals. The satellite-specific pseudorange and delta range measurement variances are used to determine the position and velocity uncertainties by a position engine, either by way of a least-squares linearization or by way of an enhanced Kalman filter. The uncertainties may be communicated to the system user, or used in generating an integrated position and velocity result from both the GNSS navigation function and an inertial navigation system result. | 06-30-2011 |
20110255433 | ROBUST PACKET DETECTION, SYMBOL TIMING, CHANNEL LENGTH ESTIMATION AND CHANNEL RESPONSE ESTIMATION FOR WIRELESS SYSTEMS - A method in accordance with an embodiment of the invention includes producing a first signal match indication based on at least one match indication indicative of a match between at least one signal received in at least one band and a reference signal. The method also includes producing a first signal multipath combined signal based upon the first signal match indication, and detecting a first peak in the first multipath combined signal. | 10-20-2011 |
20110255453 | SYSTEM AND METHOD FOR SCRAMBLING AND TIME-HOPPING - A system and method for scrambling and time-hopping in an ultra-wideband wireless network. In one embodiment, a wireless device includes a symbol mapper and a dynamic chip scrambler. The dynamic chip scrambler is configured to scramble each of a plurality of consecutive bursts of a time-hopped packet according to a pseudo-random scrambling sequence that varies from burst to burst. | 10-20-2011 |
20120106609 | SYSTEM AND METHOD FOR CHANNEL CLASSIFICATION - A system and method for classifying a channel with regard to delay spread in a wireless network applying orthogonal frequency division multiplexing. In one embodiment, a wireless receiver includes a channel classifier. The channel classifier is configured to compute a channel estimate corresponding to a channel traversed by a packet received by the wireless receiver. The channel classifier is also configured to partition the channel estimate into a plurality of windows. Each window corresponds to a range of time of the channel estimate. The channel classifier is further configured to assign a delay spread classification to the channel based on a distribution of energy across the windows. | 05-03-2012 |
20120140858 | FINE SYMBOL TIMING ESTIMATION - Systems and methods for fine symbol timing estimation are disclosed herein. In one embodiment, a wireless receiver includes a differential detector, a correlator, a coarse symbol timing estimator, and a fine symbol timing estimator. The differential detector is configured to detect phase differences in a received preamble signal modulated using differential phase shift keying. The correlator is configured to correlate symbol values output by the differential detector against a reference sequence. The coarse symbol timing estimator is configured to generate a coarse symbol timing estimate, and to generate a coarse timing sample symbol index value corresponding to the coarse symbol timing estimate. The fine symbol timing estimator is configured to generate a fine symbol timing estimate that is more accurate than the coarse symbol timing estimate based on the coarse timing sample symbol index value and correlation samples at index values preceding and succeeding the coarse timing sample index value. | 06-07-2012 |
20130039446 | FREQUENCY-DOMAIN FILTERING FOR CHANNEL ESTIMATION IN COMMUNICATIONS SYSTEMS - A method of channel estimation includes receiving a signal after transmission over a media having a plurality of sub-carriers in a frequency band. The signal is preprocessed including performing a fast Fourier transform (FFT) to generate a plurality of frequency-domain samples. Channel estimating is applied to the plurality of frequency-domain samples using (i) least squares (LS) estimation, wherein the LS estimation generates intermediate LS channel estimates for each of the sub-carriers, and (ii) frequency-domain filtering and scaling the intermediate LS channel estimates. The frequency-domain filtering uses a common frequency-domain filter consisting of a single filter coefficient vector having a plurality of frequency-domain filter coefficients to generate refined channel estimates for each of the plurality of sub-carriers. | 02-14-2013 |
20130064282 | FREQUENCY-DOMAIN EQUALIZATION AND COMBINING FOR SINGLE CARRIER TRANSMISSION - A communication receiver including a time domain receive filter to provide a filtered output, the filtered output including colored noise. The receiver also includes a frequency domain, fractionally-spaced equalizer (FSE) unit to receive the filtered output from the receive filter. The FSE unit determines a separate weighting factor for each subcarrier, and the weighting factor is determined based on a noise variance of the subcarrier. | 03-14-2013 |
20130131983 | Low-Complexity Tightly-Coupled Integration Filter for Step Detection in a Sensor-Assisted GNSS Receiver - Embodiments of the invention provide a step detection. An accelerometer measurement in the form of a multi-dimensional acceleration vector is obtained. The magnitude of the accelerometer measurement is filtered using a low pass filter. A threshold for a down-crossing is provided as is a threshold for an up-crossing. A step detection is triggered if the magnitude of the accelerometer measurement is greater than or equal to the threshold for an up-crossing. | 05-23-2013 |
20130185617 | WIRELESS BACKHAUL COMMUNICATION - A method for wireless backhaul communication comprising receiving, by a wireless backhaul transmitter, a data stream in a bit format and generating, by the wireless backhaul transmitter using a single-carrier block transmission scheme, a radio frame to include a plurality of physical data channel (PDCH) blocks, a pilot signal (PS) block and a physical control channel (PCCH) block with each block type pre-appended with a cyclic prefix (CP). A length of the PS block in symbols, a length of the PCCH block in symbols and a length of the PDCH block in symbols is determined by a frequency band, a bandwidth, and a channel condition. The wireless backhaul transmitter then transmits the radio frame. | 07-18-2013 |
20130238962 | SYSTEMS AND METHODS FOR NETWORK CODING USING CONVOLUTIONAL CODES - A network coding method includes receiving a plurality of message packets each having a packet length. Encoding the plurality of message packets by applying a convolutional code across symbols in corresponding positions of the plurality of message packets obtaining a number of encoded packets. The number of encoded packets obtained being more than the number of message packets. | 09-12-2013 |
20130268192 | Calibrating a Tightly-Coupled GNSS/MU Integration Filter - Embodiments of the invention provide methods of calibrating a blending filter based on extended Kalman filter (EKF), which optimally integrates the IMU navigation data with all other satellite measurements (tightly-coupled integration filter). In one embodiment a coordinate transformation matrix using a latest position fix is created. The state variables (for user velocity) are transformed to a local navigation coordinate. The state variables of said integration filter is estimated. A blended calibrated position fix is the output of the method. | 10-10-2013 |
20140064262 | Apparatus and Method for Processing a Physical Layer Convergence Protocol Header - Apparatus and method for processing a physical layer protocol convergence (PLCP) header. In one embodiment, a wireless device includes a PLCP header processor. The PLCP header processor is configured to: process a physical layer header, process a check value based on the physical layer header, and process an error correction code based on the physical layer header and the check value. A concatenation of the physical layer header, check value, and error correction code the PLCP header processor is configured to process consists of a number of information bits that is an integer multiple of a number of information bits per symbol used to encode the PLCP header. | 03-06-2014 |
20140064336 | ULTRA WIDEBAND MODULATION FOR BODY AREA NETWORKS - A symbol modulation system applicable to a body area network is disclosed herein. The symbol modulation system includes a symbol mapper. The symbol mapper is configured to determine a time within a predetermined symbol transmission interval at which a transmission representative of the symbol will occur. The time is determined based on a value of a symbol and a value of a time-hopping sequence. The time is selected from a plurality of symbol value based time slots, and a plurality of time-hopping sequence sub-time-slots within each symbol value based time slot. The symbol mapper is configured to generate a single guard interval within the symbol transmission interval. The single guard interval is positioned to terminate the symbol transmission interval. | 03-06-2014 |
20140233609 | ULTRA WIDEBAND MODULATION FOR BODY AREA NETWORKS - A symbol modulation system applicable to a body area network is disclosed herein. The symbol modulation system includes a symbol mapper. The symbol mapper is configured to determine a time within a predetermined symbol transmission interval at which a transmission representative of the symbol will occur. The time is determined based on a value of a symbol and a value of a time-hopping sequence. The time is selected from a plurality of symbol value based time slots, and a plurality of time-hopping sequence sub-time-slots within each symbol value based time slot. The symbol mapper is configured to generate a single guard interval within the symbol transmission interval. The single guard interval is positioned to terminate the symbol transmission interval. | 08-21-2014 |
20140362701 | NLOS WIRELESS BACKHAUL DOWNLINK COMMUNICATION - A method for communicating over a wireless backhaul channel comprising generating a radio frame comprising a plurality of time slots, wherein each time slot comprises a plurality of symbols in time and a plurality of sub-carriers in a system bandwidth, broadcasting a broadcast channel signal comprising a transmission schedule to a plurality of remote units in a number of consecutive sub-carriers centered about a direct current (DC) sub-carrier in at least one of the time slots in the radio frame regardless of the system bandwidth, and transmitting a downlink (DL) control channel signal and a DL data channel signal to a first of the remote units, wherein the DL data channel signal is transmitted by employing a single carrier block transmission scheme comprising a Discrete Fourier Transform (DFT) spreading for frequency diversity. | 12-11-2014 |
20140365848 | NLOS WIRELESS BACKHAUL UPLINK COMMUNICATION - A method for uplink (UL) wireless backhaul communication at a wireless backhaul remote unit in a radio access network comprising receiving a configuration for radio frames and a transmission schedule through a downlink (DL) physical layer broadcast channel, wherein the transmission schedule comprises a transmission allocation for the remote unit, generating a UL data frame, wherein generating the UL data frame comprises performing forward error correction (FEC) encoding on a data bit stream to generate a plurality of FEC codewords, wherein performing the FEC encoding comprises performing Reed Solomon (RS) encoding on the data bit stream to generate a plurality of RS codewords, performing byte interleaving on the RS codewords, and performing Turbo encoding on the byte interleaved RS codewords to generate one or more Turbo codewords, wherein each Turbo codeword is encoded from more than one RS codeword, and transmitting the UL data frame according to the transmission allocation. | 12-11-2014 |
20150038187 | ADDRESS SPACE PARTITIONING AND FILTERING FOR DISCRETIONARY WIRELESS CONNECTION RESPONSE - A system and method for providing wireless communications between a medical controller hub and an implant node are disclosed. The hub transmits signals to facilitate communication connections with the node. The signals include connection invitation polls with identification parameters. A node monitors the hub's transmissions for the connection invitation polls. When a poll is detected, the node compares the identification parameters to a list of preferred identification values. If the received identification parameter is on the preferred list, and the node and hub are not already connected, then the node responds to the connection invitation poll. If the received identification parameter is not on the preferred list, then the node continues to monitor hub transmissions for other connection invitation polls that include identification parameters that are on the preferred list. | 02-05-2015 |