Systems, devices, and methods for determining and establishing frequency-dependent gain compensation in wide bandwidth communication systems are disclosed. Variable frequency-dependent gain compensation circuits, or variable equalizers, have settings that configure them to establish discrete frequency-dependent gain compensation. The frequency-dependent gain compensation can include various types and levels of gain slope and/or ripple. The settings of the variable equalizers can be set by control signals established a control circuit in response to signals from an external computer. The variable equalizers are coupled to other circuits or devices and the frequency-dependent gain of the combined circuit are measured. The settings of the variable equalizer are then changed to establish an optimal frequency-dependent gain profile or frequency-dependent gain that is closest to a predetermined frequency-dependent target gain profile. The settings can then be saved in a memory or register.

Systems and methods for detecting and reducing signal interference affecting wireless communication with a mobile vehicle includes generating an interference signature based on a correlation multiple signal-quality characteristics of a desired target-signal that is received at an antenna assembly attached to the mobile vehicle, and adjusting the orientation of the antenna assembly based on a change or degradation in the interference signature to thereby improve wireless communication with the vehicle.

A system and method for highly efficient constellations of satellites which give single, double, . . . k-fold redundant full earth imaging coverage, or k-fold coverage for latitudes greater than any selected latitude is given for remote sensing instruments in short periods of time, i.e., continuous coverage, as a function of the parameters of the satellite and the remote sensing instrument for many different types of orbits. A high data rate satellite communication system and method for use with small, mobile cell phone receiving and transmitting stations is also provided. Satellite instrument performance models, full and partial satellite constellation models, and satellite cost models are disclosed and used to optimize the design of satellite systems with vastly improved performance and lower cost over current major satellite systems.

Systems and methods for detecting and reducing signal interference affecting wireless communication with a mobile vehicle includes generating an interference signature based on a correlation multiple signal-quality characteristics of a desired target-signal that is received at an antenna assembly attached to the mobile vehicle, and adjusting the orientation of the antenna assembly based on a change or degradation in the interference signature to thereby improve wireless communication with the vehicle.

A GSM satellite communication system is in communication with a first satellite having a first field of view including a first plurality of cells in which a plurality of active User Equipment (UEs) is located. The plurality of active UEs is in direct communication with the first satellite. The satellite communication system includes a first feeder link and a first tracking antenna configured to communicate with the plurality of active UEs via the first satellite directly serving the first plurality of cells; a first processing device configured to communicate with the plurality of active UEs; and a second processing device configured to normalize delay for a plurality of beam centers of the first plurality of cells, and provide the normalized delay to the first processing device.

A wireless communication method for use in a wireless terminal is disclosed. The method comprises receiving, from a wireless network node, a satellite selection policy, and applying the satellite selection policy on a satellite selection.

Disclosed in the present disclosure are channel selection and configuration methods and apparatus, which are used to resist transmission delay offset of different users within a cell and improve the signal-to-noise ratio of a random access channel sending signals, thereby improving a random access channel selection scheme suitable for a satellite communication system. At a terminal side, the channel selection method provided in an embodiment of the present disclosure comprises: determining a current signal transmission condition; and according to the current signal transmission condition and the configuration of a network, selecting the resources and channel format of a random access channel, wherein the random access channel uses a structure in which signal transmission is performed by using a means of repeated transmission by multiple preamble symbols.

Aspects of the disclosure are directed to a method for wireless communication that can include simultaneously transmitting data on a plurality of beams of a satellite.

A communication system, includes a satellite receiver in operable communication with a central server, a cellular node configured to operate within a proximity of the satellite receiver, and at least one mobile communication device configured to communicate (i) with the cellular node, (ii) within the proximity of the satellite receiver, and (iii) using a transmission signal capable of causing interference to the satellite receiver. The satellite receiver is configured to detect a repeating portion of the transmission signal and determine a potential for interference from the at least one mobile communication device based on the detected repeating portion.

Systems and methods for differentiated application of an Adaptive Coding and Modulation (ACM) to enhance link performance in satellite communication systems are disclosed. A system may include a processor and a memory storing instructions, which when executed by the processor, cause the processor to dynamically compute bandwidth capacity of a terminal from a plurality of terminals. Based on the computed bandwidth capacity of the terminal, the processor may automatically determine a ModCod to be applied for transmission to or from the terminal to optimize bit error rate (BER) performance. The to processor may determine the ModCod using an ACM technique. For the plurality of terminals, the processor may dynamically determine aggregate bandwidth availability and congestion within the ACM technique to optimize sharing of available bandwidth.