Abstract: A dual loop, clock synchronization circuit for a receiver in a communication system. The circuitry uses a first loop of a digital phase lock loop for coarse synchronization to time stamps within the received data and uses a second loop for fine synchronization of a second numerically controlled oscillator.

Abstract: The present invention relates to an improved decoding scheme for use in a concatenated channel decoder. In the present invention, the decoding of the concatenated code is done iteratively to increase the confidence for any corrected symbols. As a result, the overall performance of the decoder is improved. This iterative process comprises using a Maximal a posteriori (MAP) decoder which generates decoded information, to include Erasure Information. The output of the MAP decoder is then supplied to a Reed Solomon (RS) decoder, which attains better error correction performance by using this Erasure Information. This improved output of the RS decoder is then supplied back to the MAP decoder, thereby improving the performance of the system.

Abstract: The present invention implements a method and system for receiving content in a Satellite Digital Audio Radio Service (SDARS) system. The method includes receiving a first signal stream in an SDARS receiver, the first signal stream including the SDARS content. The method further includes receiving a second signal stream in the SDARS receiver, the second signal stream including the SDARS content, the second signal stream being delayed relative to the first signal stream by a predetermined delay time. The method further includes combining the first signal stream and the second signal stream in to a composite signal that includes the SDARS content. The method further includes powering off a portion of the SDARS receiver, wherein the powering off of the portion of the SDARS receiver does not cause a disruption in the composite signal.

Abstract: The present invention relates to an improved decoding scheme for use in a concatenated channel decoder. In the present invention, the decoding of the concatenated code is done iteratively to increase the confidence for any corrected symbols. As a result, the overall performance of the decoder is improved. This iterative process comprises using a Maximal a posteriori (MAP) decoder which generates decoded information, to include Erasure Information. The output of the MAP decoder is then supplied to a Reed Solomon (RS) decoder, which attains better error correction performance by using this Erasure Information. This improved output of the RS decoder is then supplied back to the MAP decoder, thereby improving the performance of the system.

Abstract: Method and apparatus for providing a broadband, wireless network comprising residential communications gateway that accepts all incoming communications signals and securely broadcasts those signals throughout a residence. Each communications appliance within the residence is outfitted with a receiver that decodes the broadcast signals and couples the signals to the input terminals of the associated communications appliance. The system is completely “plug-and-play” such that a user can quickly and easily utilize the gateway for many communications appliances.

Abstract: A method and apparatus for demodulating an orthogonal frequency division multiplexed (OFDM) signal. Specifically, the OFDM demodulator includes a band edge timing recovery circuit for tracking the symbol timing error and a programmable delay circuit for optimally re-sampling the OFDM signal under control of the band edge timing circuit to correct the symbol timing error. Symbol timing is recovered independent of synchronizing and training sequences in the OFDM signal, which results in reduced intercarrier interference when the sub-carriers of the OFDM signal are recovered.

Abstract: A commutating image-reject mixer includes first and second branches, each having first and second stage mixers for converting the frequency of a desired channel to an intermediate frequency (IF) and rejecting the image channel. The local oscillator (LO) ports of all the mixers are commutated between quadrature and in-phase LO signals, and the output of the branches are commutated between each other, by two complementary, 50% duty cycle clock signals. The commutating image-reject mixer exhibits improved immunity to amplitude and phase mismatches that may be present in each branch.

Abstract: A spatial diversity combiner comprises a plurality of feed forward equalizers (FFEs), a decision feedback equalizer (DFE), and a tap control circuit. The plurality of FFEs receive spatially diverse replicas of an RF signal and optimally combine them. The DFE provides feedback for tap weight control and optimal equalization of the transmission channel. Symbol error is generated by a slicer circuit or by a maximum likelihood sequence estimation (MLSE) process.

Abstract: Method and apparatus for providing a broadband, wireless network comprising a neighborhood communications gateway that accepts all incoming communications signals and securely broadcasts those signals throughout a neighborhood of residences. Each communications appliance within the neighborhood is outfitted with a receiver that decodes the broadcast signals and couples the signals to the input terminals of the associated communications appliance. The system is completely “plug-and-play” such that a user can quickly and easily utilize the gateway for many communications appliances.

Abstract: A spatial diversity combiner comprises a plurality of feed forward equalizers (FFEs), a decision feedback equalizer (DFE), and a tap control circuit. The plurality of FFEs receive spatially diverse replicas of an RF signal and optimally combine them. The DFE provides feedback for tap weight control and optimal equalization of the transmission channel. Symbol error is generated by a slicer circuit or by a maximum likelihood sequence estimation (MLSE) process.

Abstract: Method and apparatus for providing a broadband, wireless network comprising residential communications gateway that accepts all incoming communications signals and securely broadcasts those signals throughout a residence. Each communications appliance within the residence is outfitted with a receiver that decodes the broadcast signals and couples the signals to the input terminals of the associated communications appliance. The system is completely “plug-and-play” such that a user can quickly and easily utilize the gateway for many communications appliances.

Abstract: Disclosed are a system and method for providing wireless access to a network, such as the internet. The disclosed technique takes into account the inherent asymmetric and bursty characteristics of internet communication to obtain more efficiency in the communication between a user and an access provider. In doing so, the invention provides a technique that can be used to economically provide wireless access to the internet at data rates that are comparable to what a user would receive over ISDN lines.