Abstract: An approach includes injecting a plurality of equal amplitude tones across a frequency band. The approach also includes determining frequency response based on the injected tones, determining an imbalance parameter associated with a quadrature down-converter based on the determined frequency response; determining one or more parameters for wideband quadrature compensation based on the determined frequency response, and compensating an input signal based on the determined imbalance parameter and the determined one or more parameters for the wideband quadrature compensation.

Abstract: An approach includes injecting a plurality of equal amplitude tones across a frequency band. The approach also includes determining frequency response based on the injected tones, determining an imbalance parameter associated with a quadrature down-converter based on the determined frequency response; determining one or more parameters for wideband quadrature compensation based on the determined frequency response, and compensating an input signal based on the determined imbalance parameter and the determined one or more parameters for the wideband quadrature compensation.

Abstract: A satellite-based communications network employing at least one satellite and a plurality of user terminals adapted for use with the communications network. The network includes a transmitter for transmitting data to the plurality of user terminals, where the data includes a plurality of broadcast modes and/or services. The transmitter transmits data in a packetized format in which a predetermined number of data packets are transmitted in a frame, where the frame is defined as a predetermined period of time. Further, the transmitter transmits each of the plurality of broadcast modes utilizing a single carrier frequency. Each of the plurality of user terminals includes a receiver for receiving the transmitted data and for regenerating the data so that the data is made available to a device coupled to the user terminal.

Abstract: The present invention relates to a method and apparatus of using ephemeris data for positioning of an antenna of an earth station. Ephemeris data is transmitted from the satellite to the earth station, wherein the ephemeris data comprises positioning data of a satellite. The ephemeris data is received by the earth station and is used to realize the location of the satellite. The antenna of the earth station is adjusted to point toward the satellite, using the received ephemeris data.

Abstract: An antenna of an earth station is adjusted at a predetermined interval for calibration purposes. A notification of clear sky is received. Signals from a satellite are received upon the receiving of the notification of clear sky. The antenna of the earth station is adjusted to point in various directions while receiving the signals from the satellite. A direction is determined where the antenna of the earth station is pointing where the strongest signal is received from the satellite. The antenna of the earth station is positioned to point in the direction where the strongest signal is received by the satellite.