Abstract: A multipath signal is received comprising a PRN code used to determine time of arrival of a signal of interest. A correlated received signal is generated by filtering and correlating of the received multipath signal. Short-term accumulation segments are generated based on the correlated received signal. Doppler hypotheses are applied to each of the short-term accumulation segments to generate phase-corrected short-term accumulated blocks. The phase-corrected short-term accumulated blocks are accumulated to generate long-term accumulated blocks for each Doppler hypothesis. Alternatively, cross-correlation samples are generated for signal samples for each short-term accumulation segment, and the cross-correlation samples are accumulated to generate a long-term accumulated block.

Abstract: A method involves receiving cellular signals from multiple base stations at a signal monitoring unit. A first long-duration signal accumulation of the cellular signals is performed. First cells associated with the base stations are identified using the first accumulated signal. First cellular network parameters associated with the first identified cells are stored. A signal contribution of the first identified cells is removed from the first cellular signals. A second long-duration signal accumulation of the first cellular signals is performed. Second cells associated with the plurality of base stations are identified using the second accumulated signal, the second identified cells having been obscured by the first cells before the signal contribution of the first cells was removed from the first cellular signals. Second cellular network parameters associated with the second identified cells are stored. The first and second cellular network parameters of the first and second identified cells are then tracked.

Abstract: A method for location determination in a wireless communications system solves a minimization problem using estimated time-of-arrivals (TOAs) of reference signals [108, 110, 112] received by a receiving node [100] from transmitting nodes [102, 104, 106] and predetermined locations of the transmitting nodes, to produce an estimate of unknown receiving node location and/or an estimate of an unknown time of transmission (t) of the reference signals. The minimization problem is defined in terms of a theoretical system model of time-of-arrivals (TOAs), linearized globally as a function of the unknown receiving node location, the unknown time of transmission (t) of the reference signals, and an additional intermediate variable (u) that defines a non-linear quadratic constraint over position coordinates of the unknown receiving node location and the time of transmission (t) of the reference signals, wherein the minimization problem optimizes the additional intermediate variable (u).

Abstract: A method involves determining estimated positions for multiple cells within a region using cellular signals received by a receiver at multiple known receiver positions. Multiple first cell groups are determined using the multiple cells. Respective estimated positions are determined for each cell group of the first cell groups. Each cell group of the first cell groups is validated using the respective estimated position of each cell group and the known receiver positions. Multiple second cell groups are generated based on the cell group validation. An estimated position of each cell group of the second cell groups is used as an estimated position of a respective base station within the region, and a base station almanac is updated using a respective estimated position for each of the base stations.

Abstract: A wireless communications method synchronously transmits periodically from synchronized base stations of a single frequency network a common downlink synchronization signal (IoT-PSS) that underlays broadcasted signals transmitted in licensed bands of a cellular system, and a system frame number least significant bits signal (IoT-SFN-LSB) indicating timing of transmission of a system information block signal (IoT-SIB) that contains information related to downlink and uplink transmission schedules and allocations. An IoT device receives the common downlink synchronization signal and transmits uplink data only after receiving the synchronization signal and system frame number signal.

Abstract: A method involves receiving a ranging signal. A filtered ranging signal is generated using the ranging signal and used to determine a first estimated time of arrival (TOA) of the ranging signal. Multiple first time delay hypotheses of an actual TOA of the ranging signal are determined. A correlator vector is generated using the filtered ranging signal, a filtered local replica of the ranging signal, and the first time delay hypotheses. Multiple code phase discriminator vectors corresponding to second time delay hypotheses are generated, each code phase discriminator vector being based on estimated signal processing, filtering, and noise characteristics of the ranging signal for a respective second time delay hypothesis. A second estimated TOA of the ranging signal is generated using the correlator vector and the code phase discriminator vectors.

Abstract: A wireless communications method synchronously transmits periodically from synchronized base stations of a single frequency network a common downlink synchronization signal (IoT-PSS) that underlays broadcasted signals transmitted in licensed bands of a cellular system, and a system frame number least significant bits signal (IoT-SFN-LSB) indicating timing of transmission of a system information block signal (IoT-SIB) that contains information related to downlink and uplink transmission schedules and allocations. An IoT device receives the common downlink synchronization signal and transmits uplink data only after receiving the synchronization signal and system frame number signal.