Abstract: A method and system are described for optimizing signal strength of a beam-formed wireless network transmission at intended receiver(s) while reducing unintended interference with unintended receiver(s), without requiring high speed exchange of information between nodes. The method is operable by a multi-antenna node of a wireless network in which nodes use the same spectrum for both transmitting and receiving, so that the channel information between the nodes is reciprocal. This allows transmit channel information to be directly determined from signals received from unintended receivers. Scheduling information about the unintended receivers can also be estimated based on the received signals, for example by assuming that the unintended receivers will transmit as frequently as they receive, and/or by obtaining scheduling information from handshake signals or packet headers of the received signals.

Abstract: A method and system are described for applying MLD detection to SC-FDMA data streams. Embodiments obtain initial estimates of at least some symbols encoded within an SC-FDMA data input using a non-MLD algorithm, and then use the initial estimates to reduce the search space and the MLD complexity. In addition, the reduced complexity MLD (“RC-MLD”) is applied only to a limited search window within the digital communication input, thereby modeling only a subset of the symbols included in the digital communication input. The MLD complexity is thereby reduced sufficiently for an RC-MLD decoder to simultaneously model and extract a plurality of the symbols included in the data input. Symbols initially decoded by the non-MLD algorithm can be subtracted from the data input in a serial interference cancelling module. This cancellation can be applied successively in a turbo-loop.

Abstract: Methods and systems are described for determining a Demodulation Reference Sequence (DMRS) for an intercell interfering signal received from a mobile device in a Long Term Evolution (LTE) communication system. In one aspect, an interfering signal transmitted from a mobile device being served by a second cell of an LTE communication system is received at a receiver serving a first cell in the LTE communication system. At least one transmit parameter is detected from the received interfering signal. A DMRS for the received interfering signal is determined based on the detected transmit parameter.

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.

Abstract: Operating a first base station in a cellular communications network includes receiving, by the first base station from a second base station, information regarding a scheduling decision made by the second base station applicable to a second user equipment for communicating with the second base station. Communication parameters for a first user equipment to communicate with the first base station is determined based on the received information. A future occurrence at which scheduling information from the scheduling decision made by the second base station will be provided to the second user equipment is determined based on the received information. The determined communication parameters are provided to the first user equipment for communicating with the first base station, the providing substantially coinciding with the determined future occurrence.

Abstract: Systems and methods for creating non-orthogonal dimensionality between signals are disclosed. Signals are received from at least one electronic device. An adjustment of a parameter of a received signal of a first device of the at least one of the electronic device that would result in an adjusted signal that is not orthogonal but differentiates the signal from at least one other signal of the received signals is determined. An instruction is communicated to the first device to implement the adjustment of the parameter.

Abstract: A method and system are described for applying MLD detection to SC-FDMA data streams. Embodiments obtain initial estimates of at least some symbols encoded within an SC-FDMA data input using a non-MLD algorithm, and then use the initial estimates to reduce the search space and the MLD complexity. In addition, the reduced complexity MLD (“RC-MLD”) is applied only to a limited search window within the digital communication input, thereby modeling only a subset of the symbols included in the digital communication input. The MLD complexity is thereby reduced sufficiently for an RC-MLD decoder to simultaneously model and extract a plurality of the symbols included in the data input. Symbols initially decoded by the non-MLD algorithm can be subtracted from the data input in a serial interference cancelling module. This cancellation can be applied successively in a turbo-loop.

Abstract: Systems and methods for creating non-orthogonal dimensionality between signals are disclosed. Signals are received from at least one electronic device. An adjustment of a parameter of a received signal of a first device of the at least one of the electronic device that would result in an adjusted signal that is not orthogonal but differentiates the signal from at least one other signal of the received signals is determined. An instruction is communicated to the first device to implement the adjustment of the parameter.

Abstract: A method and system are described for improving operating efficiency and QoS in a cellular communications network. According to an exemplary embodiment, the method includes predicting background interference levels due at least partly to signals generated in neighboring cells, and transmitting operating parameters to user equipment that include power, frequency, and/or spectral efficiency parameters. The operating parameters are selected according to the predicted background interference to provide acceptable quality of service while also optimizing use of available bandwidth. The method further includes updating the background interference predictions, and transmitting revised operating parameters to the user equipment according to rules that minimize changes to operating parameters that strongly affect background interference in neighboring cells, such as power levels and frequencies, thereby minimizing background interference fluctuations.

Abstract: Methods and systems are described for parameter estimation based on historical context information. In one aspect, a communication context for a first mobile device is determined. The communication context is compared to a stored historical communication context of at least one other mobile device, wherein the stored historical communication context includes at least one of communication parameter estimates, mobile device statistics, mobile device transmit settings, and base station receiver settings. Parameters for communicating with the first mobile device are estimated based on the comparison.

Abstract: What is provided is a system for maintaining acceptable error rates in a MUD-enabled ad-hoc network. In this system the power spread associated with all of the nodes is maintained within the dynamic range of the system, for instance 30 dB. Also, the signal-to-noise ratio at an intended receiver is maintained above a predetermined minimum SNR, for instance above 5 dB. If the dynamic range rule is not met, then the power at the transmitting node is attenuated such that the dynamic range rule is met, checking to see that the minimum SNR rule is also met, or the transmission from this node is pulled. If there is no power control solution, then power aware scheduling is applied. Alternatively, only power aware scheduling is utilized.

Abstract: Methods and systems for processing communications based on wireless communications of adjacent base stations are disclosed. According to an aspect, a method includes monitoring, by a separate interference monitoring receiver communicatively coupled to a first base station, wireless communications transmitted by a second base station to communicate with one or more mobile devices. The method also includes determining, based on the monitored wireless communications, a wireless communication scheme for processing communications between the first base station and one or more other mobile devices. Further, the method includes processing communications between the first base station and the one or more other mobile devices based on the wireless communication scheme.

Abstract: A method of providing medium access control for a wireless mobile ad hoc network includes defining a TDMA network timing frame including a data (DATA) zone having one or more time slots structured to support multiuser detection (MUD) of concurrent transmissions during each slot, a negative acknowledgment (NACK) zone during which nodes transmit requests for retransmission of packets destined to but not successfully received by the nodes, a broadcast (BC) zone during which network management messages are broadcast to the nodes, and a control (CTRL) zone. A primary master (PM) node is selected and operates as a source of network time for all the nodes. Each node synchronizes its time to that of the PM node during the CTRL zone in a distributed manner, by exchanging control messages with the PM node or other nodes located one or more hops from the PM node.

Abstract: In the method for operating an interference multiple access communications system, wherein the improvement comprises the steps of employing a distributed scheduler within a Media Access Controller (MAC) for Multiuser Detection (MUD) enabled Mobile Ad-hoc Networks (MANETS) to increase spectral efficiency by increasing spectral use and providing a way to dynamically allocate virtual channels to achieve maximum channel reuse in different network topologies and different link patterns and to ameliorate any hidden or exposed node problems.

Abstract: A system and method of reducing or eliminating training for adaptive receiver and neural networks is disclosed. The adaptive filter or neural network is pre-training using simulation or empirically received data and a took-up table is created. Coefficient instantiation from the receiver for ail permutations of the key parameters of training data are stored along with the key parameters within the look-up table. After creating the look-up table, the key parameters of the signal to be decoded are estimated. The coefficient of filter or neural network for the estimated key parameters is obtained by accessing the loop-up table. The demodulated signal is produced by setting the filter or neural network coefficents to coefficient values obtained from the look-up table. For slow varying key parameters, the coefficients from the lookup table are occasionally replaced instead of implementing the adaptive filter or neural network.

Abstract: A QR-RLS adaptive digital filter provides fast computation without excessive computational resources. 18-bit multipliers enhance speed, and a floating point inverse square root block adjusts dynamic range in 12-dB steps. A memory stores two P-matrix copies, one being delivered with rows shifted according to the clock speed so as to enhance pipeline processing. Embodiments reliably detect modulation schemes, demodulate strong signals by passing feedback bits between multiple stages, remove impulses due to lightening, etc, erase symbol estimates which exceed an error threshold, and add high frequency noise to avoid mathematical divergence caused by excessive S/N. A genetic method is provided for identifying asynchronous spreading codes with minimum correlations, whereby randomly selected candidates compete based on Frobenius norms of their correlations, the weakest being discarded and the process being iterated.

Abstract: Systems and methods for creating non-orthogonal dimensionality between signals are disclosed. Signals are received from at least one electronic device. An adjustment of a parameter of a received signal of a first device of the at least one of the electronic device that would result in an adjusted signal that is not orthogonal but differentiates the signal from at least one other signal of the received signals is determined. An instruction is communicated to the first device to implement the adjustment of the parameter.

Abstract: In the method for operating an interference multiple access communications system, wherein the improvement comprises the steps of employing a distributed scheduler within a Media Access Controller (MAC) for Multiuser Detection (MUD) enabled Mobile Ad-hoc Networks (MANETS) to increase spectral efficiency by increasing spectral use and providing a way to dynamically allocate virtual channels to achieve maximum channel reuse in different network topologies and different link patterns and to ameliorate any hidden or exposed node problems.

Abstract: What is provided is a system for maintaining acceptable error rates in a MUD-enabled ad-hoc network. In this system the power spread associated with all of the nodes is maintained within the dynamic range of the system, for instance 30 dB. Also, the signal-to-noise ratio at an intended receiver is maintained above a predetermined minimum SNR, for instance above 5 dB. If the dynamic range rule is not met, then the power at the transmitting node is attenuated such that the dynamic range rule is met, checking to see that the minimum SNR rule is also met, or the transmission from this node is pulled. If there is no power control solution, then power aware scheduling is applied. Alternatively, only power aware scheduling is utilized.

Abstract: A method of providing medium access control for a wireless mobile ad hoc network includes defining a TDMA network timing frame including a data (DATA) zone having one or more time slots structured to support multiuser detection (MUD) of concurrent transmissions during each slot, a negative acknowledgment (NACK) zone during which nodes transmit requests for retransmission of packets destined to but not successfully received by the nodes, a broadcast (BC) zone during which network management messages are broadcast to the nodes, and a control (CTRL) zone. A primary master (PM) node is selected and operates as a source of network time for all the nodes. Each node synchronizes its time to that of the PM node during the CTRL zone in a distributed manner, by exchanging control messages with the PM node or other nodes located one or more hops from the PM node.