Abstract: The present invention is directed to a wearable fitness and/or heart rate monitoring device which includes motion detecting sensor(s), a galvanic skin response (GSR) sensor, a user input interface, or any combination thereof. The device accounts for signal noise, produced when an individual passes thru varying exercise states, by filtering out the motion of the individual using a 3-axis accelerometer. The invention also provides for systems and methods of operating the monitor which extracts and/or stores true or correct heart rate values from the heartbeat waveform signal observed from a PPG.

Abstract: The present invention is directed to a wearable fitness and/or heart rate monitoring device which includes motion detecting sensor(s), a galvanic skin response (GSR) sensor, a user input interface, or any combination thereof. The device accounts for signal noise, produced when an individual passes thru varying exercise states, by filtering out the motion of the individual using a 3-axis accelerometer. The invention also provides for systems and methods of operating the monitor which extracts and/or stores true or correct heart rate values from the heartbeat waveform signal observed from a PPG.

Abstract: Methods, systems, and apparatus, including computer-readable media, for making power adjustments in self-organizing networks. In some implementations, signal quality data is received for user devices that each communicate wirelessly with at least one base station in a set of base stations. Transmission power data indicating transmission power levels of the base stations is also received. Based on the signal quality data and the transmission power data, signal quality levels for the user devices are determined for different times corresponding to different combinations of transmission power levels of the base stations. Channel attenuation levels are estimated based on differences among signal quality levels of the multiple user devices corresponding to the different combinations of transmission power levels of the base stations. Operating parameters are provided to one or more of the base stations based on the estimated channel attenuation levels.

Abstract: Methods, systems, and apparatus, including computer-readable media, for making power adjustments in self-organizing networks. In some implementations, signal quality data is received for user devices that each communicate wirelessly with at least one base station in a set of base stations. Transmission power data indicating transmission power levels of the base stations is also received. Based on the signal quality data and the transmission power data, signal quality levels for the user devices are determined for different times corresponding to different combinations of transmission power levels of the base stations. Channel attenuation levels are estimated based on differences among signal quality levels of the multiple user devices corresponding to the different combinations of transmission power levels of the base stations. Operating parameters are provided to one or more of the base stations based on the estimated channel attenuation levels.

Abstract: Systems and methods are provided for determining the frequency of a cardiovascular pulse based on a photoplethysmographic measurement of blood in a portion of subsurface vasculature. A plurality of samples of the photoplethysmographic signal are obtained and a frequency spectrum determined based on a first set of the plurality of samples. A frequency is determined based on a maximum frequency component of the frequency spectrum. Further, a confidence level of the determined frequency of the maximum frequency component is determined based on the magnitude of the maximum frequency component and the overall energy in the frequency spectrum. A pulse rate is then determined by updating a predicted pulse rate of a second, earlier set of the plurality of samples based on the frequency of the maximum frequency component and the determined confidence level.

Abstract: A method of identifying network faults includes receiving subscriber statuses of customer premises equipment (CPE) of a communication network represented as a tree having a root node and leaf nodes. Each leaf node corresponds to a CPE. For each CPE, the method includes: (i) determining a conditional probability of the subscriber status of the CPE for each sub-tree in the network tree; (ii) determining a joint probability of the subscriber status of the CPE for every sub-tree in the network tree; (iii) determining a joint probability of the subscriber status of the CPE for every residual tree in the network tree; and (iv) determining a Bayesian posterior probability of a cut at each leaf node, given the subscriber status of the CPE. The method further includes determining a network node status topology indicating node statuses of nodes of the network tree based on the determined Bayesian posterior probabilities.

Abstract: Systems and methods are provided for determining the frequency of a cardiovascular pulse based on a photoplethysmographic measurement of blood in a portion of subsurface vasculature. A plurality of samples of the photoplethysmographic signal are obtained and a frequency spectrum determined based on a first set of the plurality of samples. A frequency is determined based on a maximum frequency component of the frequency spectrum. Further, a confidence level of the determined frequency of the maximum frequency component is determined based on the magnitude of the maximum frequency component and the overall energy in the frequency spectrum. A pulse rate is then determined by updating a predicted pulse rate of a second, earlier set of the plurality of samples based on the frequency of the maximum frequency component and the determined confidence level.

Abstract: Systems and/or methods are described for use of progressively higher-resolution codebooks for communication with one or more receivers within a cell of a base station.

Abstract: A system includes a transmitter configured to transmit data on a first set of frequencies of a plurality of frequencies. The data transmitted on the first set of frequencies is respectively transmitted using a first set of pre-coding matrices from a plurality of pre-coding matrices. The transmitter is configured to transmit data on a second set of frequencies of the plurality of frequencies. The data transmitted on the second set of frequencies is respectively transmitted using the first set of pre-coding matrices. Transmission of data on the second set of frequencies is subsequent to transmission of data the first set of frequencies.

Abstract: A method includes, in a mobile communication terminal, receiving signals from a group of cells in multiple time-frequency Resource Elements (REs). The signals include a desired signal component and an interfering signal component. A subset of the REs, in which the cells are known deterministically to transmit at least part of the interfering signal component and to not transmit the desired signal component, is identified in the terminal. An interference caused by the interfering signal component to the desired signal component is estimated in the terminal, by measuring the signals in the REs in the subset.

Abstract: Systems, methods, and other embodiments associated with adaptive low-complexity channel estimation are illustrated. In one embodiment an integrated circuit includes a controller configured to control a switch to select between a plurality of processing paths that each perform channel estimation using a different order of operations to process an orthogonal frequency-division multiplexed (OFDM) signal.

Abstract: Systems and methods are provided for suppressing interference from a received data signal. A characteristic of a channel is estimated, the channel being configured for transmission of data between a transmitting device and a receiving device having two or more receive antennas. A spatial correlation of interference is determined for the two or more receive antennas based on the channel characteristic. The received data signal is filtered based on the spatial correlation.

Abstract: The present disclosure includes systems and techniques relating to processing received spatially diverse transmissions. In some implementations, an apparatus includes: circuitry configured to receive signals from separate communication inputs; circuitry configured to filter the signals to reduce noise, interference, or both; circuitry configured to estimate covariance of the separate communication inputs, including estimating a correlation between the separate communication inputs; and circuitry configured to apply the covariance estimation to the filtering circuitry to effect noise whitening and to force an underestimation of the correlation between the separate communication inputs as applied.

Abstract: In accordance with an embodiment, there is provided a method comprising receiving, at a receiver, a desired signal and an interfering signal, wherein the interfering signal was transmitted with a modulation unknown to the receiver; identifying a likely modulation corresponding to the modulation with which the interfering signal was transmitted; and decoding the desired signal using a modulation dependent multiple-input multiple output (MIMO) detection, wherein the modulation dependent MIMO detection is based at least in part on the identified likely modulation corresponding to the modulation with which the interfering signal was transmitted, wherein the modulation dependent MIMO detection includes maximum likelihood (ML) detection.

Abstract: Systems and methods for estimating characteristics of a channel are provided. A transmission of known reference data is received at a receiving device. The reference data is transmitted over the channel that includes one or more desired layers and one or more interfering layers. Characteristics of the channel are determined based on the known reference data, where the determining includes a joint estimation of the one or more desired layers and the one or more interfering layers. The determining includes selecting certain of the layers to be estimated at each of the known reference data and selecting certain of the layers to be estimated over a range of the known reference data. The determining includes solving an equation to jointly estimate the one or more desired layers and the one or more interfering layers based on the selections. The selections reduce a number of unknown values in the equation.

Abstract: Systems, methods, apparatus, and techniques are provided for receiving signals over a communications channel, generating a plurality of successive estimates of instantaneous interference present in the communications channel at a respective plurality of samples based on the received signals, producing an average interference estimate of the interference channel based on the plurality of successive estimates, and producing a decoded codeword based on i) the average interference estimate and ii) the received signals.

Abstract: Systems and methods for suppressing interference from a data signal received at a receiving device, where the receiving device has two or more receive antennas, are provided. Characteristics of a channel are estimated, the channel being a channel through which the data signal was transmitted by a transmitting device to the receiving device. A spatial correlation of interference and noise received at the two or more receive antennas of the receiving device is determined based on the estimated characteristics of the channel. The spatial correlation indicates how the interference and noise received at a particular one of the receive antennas is related to the interference and noise received at another one of the receive antennas. The spatial correlation of the interference and noise is used to suppress interference and noise from the data signal received at the receiving device.

Abstract: A communication system includes a transmitter. The transmitter transmits information by using a plurality of pre-coding codebooks.

Abstract: Systems, methods, and other embodiments associated with processing wireless signals. According to one embodiment, a wireless receiver includes at least one antenna configured to receive a wireless signal. The wireless signal comprises pilot symbols dispersed irregularly throughout a two-dimensional grid. The pilot symbols of the wireless signal are usable by the wireless receiver to estimate the wireless channel at each point in the two-dimensional grid. The wireless receiver includes a pattern logic including hardware configured to generate additional pilot symbols in the two-dimensional grid. The additional pilot symbols generated by the pattern logic along with the pilot symbols dispersed irregularly throughout the two-dimensional grid form a regular distribution of pilot symbols in the two-dimensional grid. The wireless receiver is configured to estimate the wireless channel at each point in the two-dimensional grid based on the regular distribution of pilot symbols in the two-dimensional grid.

Abstract: Apparatus having corresponding methods and computer programs comprise: a plurality of antennas located in a first cellular telephone cell; an interference module to identify wireless cellular telephone signals received by the plurality of antennas from one or more cellular telephones located in one or more second cellular telephone cells; and a cell module to identify the one or more second cellular telephone cells based on the wireless cellular telephone signals received by the plurality of antennas from the one or more cellular telephones located in the one or more second cellular telephone cells.