Methods and systems are provided for increasing bandwidth efficiency in satellite communications. In some embodiments, a satellite communications method is provided that comprises receiving, at a satellite and from a plurality of user ground terminals, a plurality of source signals, wherein each of the source signals are modulated according to at least one source modulation method, and further receiving, at a satellite and from a plurality of user ground terminals, a plurality of information signals corresponding to the plurality of source signals. The method further includes combining, at the satellite, the plurality of source signals into a combined source signal with an overlapping bandwidth, wherein each of the source signals are further modulated according to at least one predetermined modulation method before they are combined, and transmitting, by a downlink transmission from the satellite to a gateway ground station, the combined source signal.

This electronic notch filter is able to receive an input signal and deliver a filtered signal having an amplitude, at a cut-off frequency, that is attenuated with respect to that of the input signal.

It comprises a module for integrating the input signal during several successive time windows, each time window starting at a respective initial time instant and having a duration substantially equal to the inverse of the cut-off frequency, the initial temporal time instants of at least two distinct windows being separated by a temporal shift of a value greater than or equal to a predefined reference duration, each integration of the input signal during a respective temporal window resulting in a respective intermediate signal; and a module for summing the intermediate signals coming from the integration module; the filtered signal depending on the sum of said intermediate signals.

Circuitry comprising: a first radio path comprising a first filter configured for a first radio access technology (RAT) system; a second radio path comprising a second filter configured for a second radio access technology (RAT) system different to the first RAT system; means for obtaining a first indicator, dependent on the first RAT system, wherein the first indicator is one of a predetermined number of states; means for obtaining a second indicator, dependent on the second RAT system wherein the second indicator is one of a predetermined number of states; and means for using a combination of the states of the first indicator and the second indicator to control characteristics of at least the first filter.

A high frequency (HF) radio configured to process an incoming call from another HF radio, the HF radio comprising: an adjustable-bandwidth tunable bandpass filter configured to provide HF signals that are within an adjustable-bandwidth Staring Frequency Band (SFB), being a subset of a HF band, the HF signals including analog calling signals that are indicative of incoming calls; a receive path configured to convert the analog calling signals to digital calling signals; a plurality of receivers configured to monitor assigned Automatic Link Establishment (ALE) channels within the SFB for the digital calling signals; and a controller configured to: establish a communication link between the HF radio and the another HF radio, in response to a given receiver of the receivers decoding a digital calling signal that is indicative of the incoming call; and select the SFB and the assigned ALE channels, based on an indication of ionospheric propagation conditions.

Methods and systems are provided for increasing bandwidth efficiency in satellite communications. In some embodiments, a satellite communications method is provided that comprises receiving, at a satellite and from a plurality of user ground terminals, a plurality of source signals, wherein each of the source signals are modulated according to at least one source modulation method, and further receiving, at a satellite and from a plurality of user ground terminals, a plurality of information signals corresponding to the plurality of source signals. The method further includes combining, at the satellite, the plurality of source signals into a combined source signal with an overlapping bandwidth, wherein each of the source signals are further modulated according to at least one predetermined modulation method before they are combined, and transmitting, by a downlink transmission from the satellite to a gateway ground station, the combined source signal.

A system that incorporates aspects of the subject disclosure may perform operations including, for example, a method of identifying, by a system comprising a processor, network communication degradation in one or more layers of a multi-layered communication protocol above a physical layer, wherein the network communication degradation is associated with communications taking place through a network, in part over a radio frequency link, between a plurality of communication devices, obtaining, by the system, data from a layer below the one or more layers of the multi-layered communication protocol identified as having the network communication degradation, determining, by the system, one or more geographic regions of the network associated with the network communication degradation from the data, and mitigating, by the system, effects of the network communication degradation in the one or more geographic regions of the network. Other embodiments are disclosed.

A wireless receiver includes a down converter module operable to deliver a signal having a signal bandwidth that changes over time, a dynamically controllable filter module having a filter bandwidth and fed by said down converter module, and a measurement module operable to at least approximately measure the signal bandwidth, said dynamically controllable filter module responsive to said measurement module to dynamically adjust the filter bandwidth to more nearly match the signal bandwidth as it changes over time, whereby output from said filter module is noise-reduced. Other wireless receivers, electronic circuits, and processes for their operation are disclosed.

A system that incorporates aspects of the subject disclosure may perform operations including, for example, obtaining uplink information associated with a plurality of communication devices transmitting wireless signals on a plurality of uplink paths, performing, based on the uplink information, a plurality of measurements of the plurality of uplink paths, identifying a measurement from the plurality of measurements that is below a threshold, and initiating a corrective action to improve a measurement of an affected uplink path of the plurality of uplink paths based on the identifying. Other embodiments are disclosed.

The present invention discloses a signal receiving apparatus having phase compensation mechanism. A first and a second receiving path of a receiving circuit perform frequency down-conversion and analog-to-digital conversion on an input signal to generate a first and a second receiving signals. The first and the second receiving paths uses a RF training signal generated by a RF training signal generation circuit as the input signal when a phase compensation is performed, and use a data signal from an antenna circuit as the input signal when a beamforming signal receiving is performed. A phase difference calculation circuit of the receiving circuit performs cross-correlation operation on the first and the second receiving signals to generate a compensation signal according to a phase difference between the first and the second receiving paths. A phase compensation circuit of the receiving circuit performs compensation on the first receiving signal or the second receiving signal such that the first receiving signal and the second receiving signal have substantially identical phases after compensation.

A system that incorporates aspects of the subject disclosure may perform operations including, for example, obtaining uplink information associated with a downlink path, wherein the uplink information includes operational parameters used by a plurality of communication devices for transmitting wireless signals on a plurality of uplink paths; performing, based on the uplink information, a plurality of measurements of the plurality of uplink paths; identifying a measurement from the plurality of measurements that is below a threshold, thereby indicating an affected uplink path of the plurality of uplink paths; initiating a first filtering of the affected uplink path, wherein the initiating is based on the identifying and wherein the first filtering is based upon one or more first filtering parameters; and receiving instructions comprising one or more updated filtering parameters, wherein the instructions are received by the system at a port of the system. Other embodiments are disclosed.