Abstract: A method of transmitting distributed data over a channel includes distributing data from a data source to N number of collaborating transmitter devices operable to synchronously transmit N number of contributing data signals based on the data to a receiver over a channel. Channel state information of the channel between each transmitter device and the receiver is obtained. A spatial spectral weight (SSW) filter for each transmitter device based on the obtained channel state information is determined. The SSW filter associated with each transmitter device is applied to each contributing data signal transmitted from the associated transmitter device. The N number of contributing data signals filtered by the SSW filters are transmitted through the channel to the receiver, such that the contributing data signals are received at the receiver synchronously and in substantial phase alignment such that the contributing data signals coherently combine to form a coherently combined data signal.

Abstract: There is set forth herein, in one embodiment, obtaining with a radiofrequency receiver a combined radiofrequency signal having a first stream combined with a second stream, wherein the first stream has a first power level, and wherein the second stream has a second power level, the first power level of the first stream being greater than the second power level of the second stream, wherein the radiofrequency receiver includes one or more antenna; processing the combined radiofrequency signal to recover a first digital bitstream associated to the first stream; and recovering a digital bitstream associated to the second stream using the first digital bitstream.

Abstract: Embodiments of the present invention include a system, method and computer program product for mitigating interference in data received by a multiple antenna array. Processor(s) executing program code identify signals from users, including active users, and by identifying these signals, mitigate interference and jamming in the received data, overall.

Abstract: A system and method for secure communications is disclosed which includes a processor(s) of a first appliqué spreading an uplink signal of a user from user equipment, where the first appliqué is coupled to the user equipment, and where the user equipment is connected to a mobile network. The processor(s) frequency shifts the spread uplink signal to maintain orthogonality over the mobile network.

Abstract: A method of transmitting distributed data over a channel includes distributing data from a data source to N number of collaborating transmitter devices operable to synchronously transmit N number of contributing data signals based on the data to a receiver over a channel. Channel state information of the channel between each transmitter device and the receiver is obtained. A spatial spectral weight (SSW) filter for each transmitter device based on the obtained channel state information is determined. The SSW filter associated with each transmitter device is applied to each contributing data signal transmitted from the associated transmitter device. The N number of contributing data signals filtered by the SSW filters are transmitted through the channel to the receiver, such that the contributing data signals are received at the receiver synchronously and in substantial phase alignment such that the contributing data signals coherently combine to form a coherently combined data signal.

Abstract: Embodiments of the present invention include a system, method and computer program product for mitigating interference in data received by a multiple antenna array. Processor(s) executing program code identify signals from users, including active users, and by identifying these signals, mitigate interference and jamming in the received data, overall.

Abstract: Methods and apparatus are set forth herein. Methods and apparatus can include for example: receiving for input into an non-linear device a radio signal, the radio signal being a composite signal composed of a signal of interest and an interfering signal, wherein the signal of interest and the interfering signal are at a common frequency; controlling a power level of the radio frequency input signal received at the non-linear device so that the non-linear device provides a non-linear effect; and processing an output signal output by the non-linear device to determine a characteristic of the signal of interest.

Abstract: Methods and apparatus are set forth herein. Methods and apparatus can include for example: receiving for input into an non-linear device a radio signal, the radio signal being a composite signal composed of a signal of interest and an interfering signal, wherein the signal of interest and the interfering signal are at a common frequency; controlling a power level of the radio frequency input signal received at the non-linear device so that the non-linear device provides a non-linear effect; and processing an output signal output by the non-linear device to determine a characteristic of the signal of interest.

Abstract: Provided herein are processes for locating wireless emitters. The processes provided may include use of an apparatus that includes a signal processing circuit configured to obtain a reference signal and a target signal, and process the reference signal and target signal to determine and output a reference channel value and a target channel value. The processes provided may also include use of an apparatus that includes a signal processing circuit configured to obtain a pair of reference channel values and a pair of target channel values, process the reference channel values and pair of target channel values to determine a phase-difference metric, and process the phase-difference metric to determine a set of spatial location coordinates. The set of spatial location coordinates may correspond to a location of a target emitter.

Abstract: Provided are processes for suppressing jamming signals that may include use of a signal processing circuit. A signal processing circuit can be configured to obtain a jamming signal and a feedback signal, process the jamming signal and the feedback signal to determine a cancellation signal for use in suppressing the jamming signal, and output the cancellation signal to a radio-frequency transmitter. The signal processing circuit may be further configured to obtain a transmission signal, determine a jamming channel from the jamming signal and a feedback channel from the feedback signal, and combine the transmission channel, jamming channel, and feedback channel to determine a transfer function, where the transfer function is configured to determine the cancellation signal.

Abstract: Provided are processes for suppressing jamming signals that may include use of a signal processing circuit. A signal processing circuit can be configured to obtain a jamming signal and a feedback signal, process the jamming signal and the feedback signal to determine a cancellation signal for use in suppressing the jamming signal, and output the cancellation signal to a radio-frequency transmitter. The signal processing circuit may be further configured to obtain a transmission signal, determine a jamming channel from the jamming signal and a feedback channel from the feedback signal, and combine the transmission channel, jamming channel, and feedback channel to determine a transfer function, where the transfer function is configured to determine the cancellation signal.

Abstract: A directional notch filter for simultaneous transmit and receive of wideband signals comprises an antenna, an antenna match, a receiver, a power combiner, a first directional coupler, a second directional coupler and a shaping filter accepting a signal and producing a compensation signal as a replica of an antenna reflection transfer function, wherein the first and second directional couplers produce signals and portions of signals received by the antenna and sent to the receiver via the power combiner. The receiver can produce a receiver signal and the first directional coupler can produce a first signal as a portion of an overall signal received by the antenna, the first signal comprising at least reflection of a signal from the power amplifier and the second directional coupler samples a small portion of the receiver signal, said second directional coupler producing a second signal.

Abstract: An adaptive wireless multiple-input multiple-output (MIMO) system switches among two or more modes of operation including Uninformed Transmitter (UT) and Informed Transmitter (IT) modes based on channel conditions as reflected in a set of metrics including a temporal selectivity metric (TSM) indicative of the temporal dynamics of the MIMO channel. In an exemplary embodiment, the adaptive MIMO system uses a dominant eigenmode IT mode of operation if a signal-to-noise ratio is below a threshold, otherwise, the system uses an IT mode or a UT mode based on the TSM. If the TSM indicates a channel that is changing too rapidly for feedback to be effective, the UT mode is used, otherwise the IT mode is used. Overall system capacity in time varying MIMO channels is thereby improved.

Abstract: A directional notch filter for simultaneous transmit and receive of wideband signals comprises an antenna, an antenna match, a receiver, a power combiner, a first directional coupler, a second directional coupler and a shaping filter accepting a signal and producing a compensation signal as a replica of an antenna reflection transfer function, wherein the first and second directional couplers produce signals and portions of signals received by the antenna and sent to the receiver via the power combiner. The receiver can produce a receiver signal and the first directional coupler can produce a first signal as a portion of an overall signal received by the antenna, the first signal comprising at least reflection of a signal from the power amplifier and the second directional coupler samples a small portion of the receiver signal, said second directional coupler producing a second signal.

Abstract: An adaptive wireless multiple-input multiple-output (MIMO) system switches among two or more modes of operation including Uninformed Transmitter (UT) and Informed Transmitter (IT) modes based on channel conditions as reflected in a set of metrics including a temporal selectivity metric (TSM) indicative of the temporal dynamics of the MIMO channel. In an exemplary embodiment, the adaptive MIMO system uses a dominant eigenmode IT mode of operation if a signal-to-noise ratio is below a threshold, otherwise, the system uses an IT mode or a UT mode based on the TSM. If the TSM indicates a channel that is changing too rapidly for feedback to be effective, the UT mode is used, otherwise the IT mode is used. Overall system capacity in time varying MIMO channels is thereby improved.

Abstract: A STBICM MIMO receiver includes a plurality of demappers for demapping a plurality of complex symbols transmitted by a STBICM MIMO transmitter. Each demapper is configured to have one or more complex symbols associated therewith and is responsible for demapping its associated complex symbols.

Abstract: A wireless Internet access system and method supports the transmission and reception of multiple types of traffic between mobile subscriber units and existing networks. A frame structure is used that can support the transmission of multiple types of traffic and adapt to changes in the traffic types needed and the amount of data for a particular traffic type. In addition, data transmission is performed using orthogonal frequency division multiplexing and differential phase shift keying to avoid intersymbol interference. Receiving units in the mobile subscriber units and existing networks include antenna arrays to provide a multipath transmission.

Abstract: A wireless Internet access system and method supports the transmission and reception of multiple types of traffic between mobile subscriber units and existing networks. A frame structure is used that can support the transmission of multiple types of traffic and adapt to changes in the traffic types needed and the amount of data for a particular traffic type. In addition, data transmission is performed using orthogonal frequency division multiplexing and differential phase shift keying to avoid inter-symbol interference. Receiving units in the mobile subscriber units and existing works include antenna arrays to provide a multipath transmission.

Abstract: Reliable transferring of data between mobile wireless nodes positioned at two points in a wireless network occurs through the dynamic formation of transmit/receive groups that collectively establish reliable communications. A mobile node at each point creates a neighbor list by periodically probing its surroundings to discover nearby nodes with which it can relaibly communicate. Prior to establishing a route or transmitting data, a node A first probes a distant next point in the network to determine if it can reliably communicate with that point. Upon receiving this probe and knowing one's neighbors, the nodes at this distant point dynamically form a receive group and choose a controlling node. Members of the group individually receive all future data from node A and pass the received data to the controlling node, which combines the individual signals for reliable reception.

Abstract: In a geo-location system, the location of an object in space is determined by transmitting polarized signals towards the object. To prevent erroneous determinations due to signals which reach the object after reflection the transmitted signals are polarized. The receiver at the object includes a cross-polarization discriminator and accepts only directly transmitted signals and not reflected signals which have been cross-polarized by the reflection. The transmitted signals may be ultra-wide band signals which can penetrate into buildings. An object whose location can thus be determined can also transmit polarized signals to another object which can not be reached by signals from the original transmitter. Further the ultra-wide band signals may utilize transmission in discontinuous frequency bands to avoid interference with existing systems.