Abstract: Methods and systems for determining scheduling information of a base station in a network operating according to the Long Term Evolution (“LTE”) standard include monitoring transmissions on the PDCCH of the wireless base station, maintaining a list of active Radio Network Temporary Identifiers (“RNTI's”) assigned by the wireless base station to user equipment, extracting PDCCH detections from the monitored transmissions, applying at least one false alarm reduction strategy to eliminate invalid PDCCH detections from the extracted PDCCH detections, said false alarm reduction strategy including determining an RNTI that is valid for an extracted PDCCH detection and determining if the valid RNTI is included in the list of active RNTI's. Scheduling information of the wireless base station is determined from the extracted PDCCH detection.

Abstract: Methods and systems for obtaining improved joint channel estimates for a multi-user, frequency-multiplexed data transmission such as SC-FDMA or OFDM begins by estimating separate contributions of users (and/or other signal sources) to the received signal based on joint frequency domain channel estimates. A reduced data set is obtained by subtracting contributions of one or more users from the received data, leaving only the estimated contributions of the remaining users, with noise and residual estimation error signal. Time domain joint channel estimation is then performed on the reduced data set, which is feasible because the number of users has been reduced. In exemplary embodiments, the reduced data set includes only one estimated user contribution. This process is repeated to obtain time domain estimates for all of the users. The method can be repeated by using the TD channel estimates to re-estimate the user contributions and calculate revised TD channel estimates.

Abstract: Methods and systems are described for calibrating phase hardware-induced distortion in a cellular communications system. In one aspect, an estimate of a phase difference at a user equipment (UE) between downlink channels including signals sent over two or more BS transmitter chains is obtained. A phase difference between uplink channels including signals received over two or more BS receiver chains is determined. A relative phase distortion induced by two or more BS transceiver chains is determined based on the received estimate of phase difference between downlink channels and the determined phase difference between uplink channels.

Abstract: Methods and systems for determining scheduling information of a base station in a network operating according to the Long Term Evolution (“LTE”) standard include monitoring transmissions on the PDCCH of the wireless base station, maintaining a list of active Radio Network Temporary Identifiers (“RNTI's”) assigned by the wireless base station to user equipment, extracting PDCCH detections from the monitored transmissions, applying at least one false alarm reduction strategy to eliminate invalid PDCCH detections from the extracted PDCCH detections, said false alarm reduction strategy including determining an RNTI that is valid for an extracted PDCCH detection and determining if the valid RNTI is included in the list of active RNTI's. Scheduling information of the wireless base station is determined from the extracted PDCCH detection.

Abstract: Methods and systems are described for over the air synchronization in a cellular network. In one aspect, data that is in the presence of interference either from other proximate base stations or from a local synchronization base station is received from a base station that will be synchronized to. A joint signal processing technique is employed on the data to obtain known downlink reference signals having sufficient signal-to-interference plus noise ratio (“SINR”) for time or frequency synchronization. Time or frequency synchronization is determined based on the known downlink reference signals.

Abstract: An improved receiver design implements a practical method for modeling users in SIC turbo loop multiuser detection architectures, wherein in each loop unsubtracted estimation errors from previous loops are used to appropriately scale the error covariance matrix for each user, thereby accurately representing the remaining residual interference in the data stream for each desired user. The effect of estimation errors in previous interference cancellation operations is thereby minimized, and symbol estimations in successive turbo loops are improved, for example during multiuser MMSE, multiuser MMSE with interference rejection combining (MMSE-IRC), sample matrix inversion (SMI), or any of their adaptive variants (least mean-square, recursive least square, Kalman filter etc.). The estimated residual symbol energy can be computed per symbol, and then applied to entire data streams, to groups of symbols, or to each symbol separately.

Abstract: Methods and systems for obtaining improved joint channel estimates for a multi-user, frequency-multiplexed data transmission such as SC-FDMA or OFDM begins by estimating separate contributions of users (and/or other signal sources) to the received signal based on joint frequency domain channel estimates. A reduced data set is obtained by subtracting contributions of one or more users from the received data, leaving only the estimated contributions of the remaining users, with noise and residual estimation error signal. Time domain joint channel estimation is then performed on the reduced data set, which is feasible because the number of users has been reduced. In exemplary embodiments, the reduced data set includes only one estimated user contribution. This process is repeated to obtain time domain estimates for all of the users. The method can be repeated by using the TD channel estimates to re-estimate the user contributions and calculate revised TD channel estimates.

Abstract: Methods and systems for obtaining improved joint channel estimates for a multi-user, frequency-multiplexed data transmission such as SC-FDMA or OFDM begins by estimating separate contributions of users (and/or other signal sources) to the received signal based on joint frequency domain channel estimates. A reduced data set is obtained by subtracting contributions of one or more users from the received data, leaving only the estimated contributions of the remaining users, with noise and residual estimation error signal. Time domain joint channel estimation is then performed on the reduced data set, which is feasible because the number of users has been reduced. In exemplary embodiments, the reduced data set includes only one estimated user contribution. This process is repeated to obtain time domain estimates for all of the users. The method can be repeated by using the TD channel estimates to re-estimate the user contributions and calculate revised TD channel estimates.

Abstract: Methods and systems are described for calibrating phase hardware-induced distortion in a long term evolution (LTE) communications system. In one aspect, an estimate of a phase difference at a user equipment (UE) between downlink channels including signals sent over two or more BS transmitter chains is received from the UE in an LTE communications system. A phase difference between uplink channels including signals received over two or more BS receiver chains is determined at a BS. A relative phase distortion induced by two or more BS transceiver chains is determined based on the received estimate of phase difference between downlink channels and the determined phase difference between uplink channels.

Abstract: Methods and systems are described for calibrating phase hardware-induced distortion in a long term evolution (LTE) communications system. In one aspect, an estimate of a phase difference at a user equipment (UE) between downlink channels including signals sent over two or more BS transmitter chains is received from the UE in an LTE communications system. A phase difference between uplink channels including signals received over two or more BS receiver chains is determined at a BS. A relative phase distortion induced by two or more BS transceiver chains is determined based on the received estimate of phase difference between downlink channels and the determined phase difference between uplink channels.

Abstract: Methods and systems are described for calibrating amplitude hardware-induced distortion in a long term evolution (LTE) communications system. In one aspect, a power status indication is received at a base station (BS) associated with a centralized radio access network (C-RAN) of an LTE communications system from a user equipment (UE) communicating in the LTE communications system. A downlink pathloss associated with communications to the UE is estimated based on the received power status indication. Downlink power allocation is performed at the C-RAN based on the downlink pathloss estimates of one or more UEs.

Abstract: Methods and systems are described for providing a rapidly self-organizing cellular communications network. In one aspect, scheduling information is received for at least one mobile device previously scheduled for communication in a first cell of a cellular communications network, the scheduling information corresponding to a scheduling decision made for the first cell without the knowledge of scheduling decisions made for a second cell adjacent to the first cell. Whether to initiate a handover procedure to handover the mobile device to the first cell is determined based on the received scheduling information. The mobile device for is scheduled for communications in the second cell and/or the handover procedure is initiated based on the determination.

Abstract: Methods and systems for performing compressed time domain joint channel estimation in a multi-user MIMO LTE wireless network include receiving training signals from a plurality of users, estimating a maximum delay spread for the received data according to a coherence bandwidth of the received data, limiting the received data in the time domain to the estimated maximum delay spread, selecting and estimating an active tap from the limited data set, and subtracting a contribution of the selected active tap from the reduced data set. These steps can be repeated until the residual signal falls below a specified minimum. The network can be a C-RAN network. The training data can be SRS or DMRS data. Limiting the received data ensures that only a few significant taps are analyzed, so that the system is not under determined and can be analyzed for accurate channel estimation using any of several existing algorithms.

Abstract: Methods and systems are described for providing a rapidly self-organizing cellular communications network. In one aspect, scheduling information is received for at least one mobile device previously scheduled for communication in a first cell of a cellular communications network, the scheduling information corresponding to a scheduling decision made for the first cell without the knowledge of scheduling decisions made for a second cell adjacent to the first cell. Whether to initiate a handover procedure to handover the mobile device to the first cell is determined based on the received scheduling information. The mobile device for is scheduled for communications in the second cell and/or the handover procedure is initiated based on the determination.

Abstract: Methods and systems are described for providing a rapidly self-organizing cellular communications network. In one aspect, scheduling information is received for at least one mobile device previously scheduled for communication in a first cell of a cellular communications network, the scheduling information corresponding to a scheduling decision made for the first cell without the knowledge of scheduling decisions made for a second cell adjacent to the first cell. At least one parameter is determined, based on the received scheduling information, for communications in the second cell that improves performance of the first cell. Communications with mobile devices served by the second cell are adjusted based on the determined at least one parameter.

Abstract: A system and method for converting a non-cognitive radio into a cognitive radio is presented. A cognitive radio system includes, a non-cognitive radio; an electronic device, a spectrum sensing logic and configuration and management logic. The electronic device is connected to the non-cognitive radio so that it receives and/or transmits messages to/from a wireless network. The configuration and management logic is connected between the non-cognitive radio and the spectrum sensing logic. The spectrum sensing logic and the configuration and management logic are removable from the non-cognitive radio allowing the cognitive radio to operate in a non-cognitive mode. The spectrum sensing logic senses a wireless environment to determine available frequencies and available channels. The configuration and management logic transmits available frequencies, available channels or other spectrum data to a remote spectrum manager that is managing access to the wireless network.

Abstract: Methods and systems for determining scheduling information of a base station in a network operating according to the Long Term Evolution (“LTE”) standard include monitoring transmissions on the PDCCH of the wireless base station, maintaining a list of active Radio Network Temporary Identifiers (“RNTI's”) assigned by the wireless base station to user equipment, extracting PDCCH detections from the monitored transmissions, applying at least one false alarm reduction strategy to eliminate invalid PDCCH detections from the extracted PDCCH detections, said false alarm reduction strategy including determining an RNTI that is valid for an extracted PDCCH detection and determining if the valid RNTI is included in the list of active RNTI's. Scheduling information of the wireless base station is determined from the extracted PDCCH detection.

Abstract: Methods and systems are described for communicating data selectively via heterogeneous communication network links. In one aspect, a network link selector (NLS) determines respective data costs associated with communicating data via a plurality of heterogeneous network links each linking to one or more networks. One or more network links to communicate data between a remote network node and a user device remotely communicating with the NLS via a network is selected from among the plurality of heterogeneous network links based on the determined respective data costs. Communicating the data via the selected link is provided for. In another aspect, link selection information based on respective data costs is received via a network from an NLS. One or more network links is selected from among the plurality of heterogeneous network links based on the received link selection information. The data is communicated via the selected link.

Abstract: Methods and systems are described for optimizing a predictive model for mobile network communications based on historical context information. In one aspect, historical context information is collected including at least one of communication environment, communication parameter estimates, mobile device statistics, mobile device transmit settings, base station receiver settings, past network statistics and settings, and adjacent network node information statistics and settings, the historical context information including data from communications of at least one mobile device. A predictive model for network communications is determined based on the historical context information. A communication context for a first mobile device different than the at least one mobile device is determined. The first device is scheduled and/or network parameters are set based on the determined predictive model. Actual to expected results are compared and the predictive model is adjusted based on the comparison.

Abstract: Methods and systems are described for determining a radio network temporary identifier (RNTI) and coding rate for an intercell signal in an LTE network. In one aspect, a plurality of potential RNTIs (that is a subset of all available RNTIs) associated with a received intercell signal is determined. A first signal based on a first potential combination of a one of the plurality of RNTIs and a coding rate is processed by a first decoder. Whether the first potential combination includes a correct RNTI and coding rate combination for the received intercell signal is determined based on at least one metric for the processed first signal. A second signal based on a second potential combination of a one of the plurality of RNTIs and a coding rate is processed by a second decoder if the first potential combination does not include the correct RNTI and coding rate combination.