Abstract: Communications network architectures integrate communications using a geosynchronous satellite communications system including a geosynchronous communications satellite operating in the fixed satellite service (FSS) band and a low earth orbit satellite communications system including a plurality of low earth orbit communications satellites. A low earth orbit gateway having a terminal is used to communicate with the low earth orbit communications satellites using multiple access communication channels, and is used to communicate with a public switch telephone network. A geosynchronous gateway having a terminal is used to communicate with the geosynchronous communications satellite by overlaying multiple access communication channels onto fixed channel assignments and transmitting the overlayed channel assignments. The terminal in the geosynchronous gateway is also used to communicate with the public switch telephone network.

Abstract: A system and method for providing quality of service and transponder utilization billing for use with a data broadcasting system. The data broadcast system includes a plurality of receivers coupled to a plurality of channel encoders, a multiplexer for multiplexing encoded channels, and a transmitter for transmitting the channels. A video system controller is coupled to the multiplexer and channel encoders. A content access management system schedules, tracks, and reports customer content, and a transponder management system outputs billing reports. In accordance with the present invention, the multiplexer generates statistical feedback to the encoders to control encoding quantization rates to achieve optimum channelized video throughput. The video system controller generates quality parametrics comprising average channel quantization rates that are indicative of the quality of each channel of the data broadcasting system.

Abstract: The present invention relates to a self-synchronous spread spectrum transmitter and an associated remote spread spectrum receiver which communicate with each other by the transmission of both (1) a spread spectrum Pseudo Noise Code (PNC) sequence signal, and (2) a combined PNC sequence plus the data information (PNC+data) signal. The two signals can be transmitted concurrently using either different frequency bands or on a quadrature carrier; or the two signals can be transmitted with a time offset between signals. At the receiver the PNC and the PN+data signals are separately recovered for the case of the concurrent transmission techniques, and directly mixed to despread the received signal and recover the data signal at baseband.

Abstract: The present invention relates to a technique for suppressing intermodulation products introduced by nonlinearities of a laser in a multicarrier Freqeuncy Division Multiplexed (FDM) fiberoptic link. More particularly, for two or more closely spaced FDM channel information signals within a predetermined band of frequencies in an FDM optical transmission system, third-order intermodulation products, which are produced by nonlinearities of a transmitting laser, also fall in-band and provide interference in the channel information signals.

Abstract: The present invention relates to an antenna sidelobe or interference cancellation arrangement including an antenna with a monopulse feed, for providing a sum and difference pattern signal, and an omnidirectional feed for providing a flat pattern signal. The flat pattern signal is used to appropriately shift the lobes of the received difference pattern signal in a first canceller section to substantially correspond to the location of the lobes of the received sum pattern signal. The shifted difference pattern signal is then used to cancel interference in the sum pattern signal in a second canceller section to generate an output signal at the cancellation arrangement which is relatively interference free over a wide band of frequencies.