Abstract: The disclosed embodiments relate to a system and method for processing digital communication signals. An exemplary system comprises a first input adapted to receive a first digital communication signal, a second input adapted to receive a second digital communication signal, an upconverter adapted to generate a multichannel digital signal that incorporates data corresponding to the first digital signal at a first frequency and data corresponding to the second digital signal at a second frequency, and a digital-to-analog converter adapted to convert the multichannel digital signal to a multichannel analog signal.

Abstract: An ATSC (Advanced Television Systems Committee-Digital Television) receiver comprises an equalizer and a lock detector. The equalizer provides a sequence of received signal points from a constellation space, the constellation space having an inner region and one, or more, outer regions. The lock detector determines equalizer lock as a function of the number of received signal points falling in the one, or more, outer regions.

Abstract: An ATSC (Advanced Television Systems Committee-Digital Television) receiver comprises an equalizer (220) and a lock detector (230). The equalizer (220) provides a sequence of received signal points (221) from a constellation space, the constellation space having an inner region and one, or more, outer regions. The lock detector (230) determines equalizer lock as a function of a noise power estimate developed from the number of received signal points falling in the one, or more, outer regions (305).

Abstract: A carrier recovery and equalization architecture for use with a digital communication system receiver can include a carrier tracking loop having an equalizer. The equalizer can be selectively positionable to a location that is external to the carrier tracking loop (FIG. 3) and to a location within the carrier tracking loop (FIG. 2).

Abstract: An ATSC (Advanced Television Systems Committee-Digital Television) receiver comprises an equalizer and a controller. The equalizer provides a sequence of received signal points from a constellation space, the constellation space having an inner region and one, or more, outer regions. The controller provides a coefficient gain value for use in adjusting tap coefficient values of the equalizer, wherein the coefficient gain value is as a function of which region of the constellation space the received signal points fall within.

Abstract: A communication system comprising a transmitter that is adapted to transmit a data signal that is broken into a plurality of time slots. The transmitter inserts communication data into a subset of the plurality of time slots and to create null data representative of information about the communication system. The null data is inserted into a subset of the plurality of time slots not occupied by communication data. A communication system comprising a receiver that receives a data signal that is broken into a plurality of time slots. The receiver identifies correlation peaks in the data signal that correspond to a subset of the plurality of time slots, the subset of the plurality of time slots including null data representative of information about the communication system. The receiver may associate logical values with the correlation peaks and decode the logical values to obtain the information about the communication system.

Abstract: The disclosed embodiments relate to a system for generating forward error correction (FEC) packets. The system includes a first FEC encoder that receives data and encodes first FEC data with the data to form FEC encoded data. Also included in the system is a second FEC encoder that encodes the FEC encoded data to produce second FEC data. An FEC packet formatter formats the second FEC data into an FEC packet.

Abstract: There is provided a correlation method for spread spectrum signals. Correlation peaks in packet headers included in the spread spectrum signals are detected by averaging known signals that repeat in the packet headers. Data corresponding to the spread spectrum signals is recovered based on the correlation peaks.

Abstract: The disclosed embodiments relate to a system for generating forward error correction (FEC) packets. The system includes a first FEC encoder that receives data and encodes first FEC data with the data to form FEC encoded data. Also included in the system is a second FEC encoder that encodes the FEC encoded data to produce second FEC data. An FEC packet formatter formats the second FEC data into an FEC packet.

Abstract: The disclosed embodiments relate to a communication system comprising a transmitter that is adapted to transmit a data signal that is broken into a plurality of time slots. The transmitter is adapted to insert communication data into a subset of the plurality of time slots and to create null data representative of information about the communication system. The null data is inserted into a subset of the plurality of time slots not occupied by communication data. Other disclosed embodiments relate to a communication system comprising a receiver that is adapted to receive a data signal that is broken into a plurality of time slots. The receiver is adapted to identify correlation peaks in the data signal that correspond to a subset of the plurality of time slots, the subset of the plurality of time slots including null data representative of information about the communication system.

Abstract: An adaptive channel equalizer (50) for processing a demodulated VSB signal containing terrestrial broadcast high definition television information includes an adaptive feed forward filter (FFF 20) and an adaptive decision feedback filter (DFF 30). The equalizer is preceded by a demodulator/carrier recovery network (18) and does not include a carrier recovery function in the equalizer control loop. The equalizer FFF and DFF elements operate adaptively in blind, training, and decision-directed modes. A direct connection provided from the equalizer output to the DFF facilitates coarse signal acquisition and equalization during the blind operating mode.

Abstract: There is provided a correlation method for spread spectrum signals. Correlation peaks in packet headers included in the spread spectrum signals are detected by averaging known signals that repeat in the packet headers. Data corresponding to the spread spectrum signals is recovered based on the correlation peaks.

Abstract: An adaptive channel equalizer (50) for processing a demodulated VSB signal containing terrestrial broadcast high definition television information operates adaptively in blind, training, and decision-directed modes. The VSB signal is characterized by a data frame format (FIG. 2) constituted by a succession of data fields each containing a data segment prefaced by a field sync segment. Equalization is expedited by recycling (35) received training data through the equalizer more than once during a VSB data field after a field sync segment is detected.

Abstract: A wireless telephone system comprises a base transceiver having a base receiver and a plurality of wireless handsets. Each handset comprises a handset transceiver for establishing a time-division multiple access (TDMA) link over a shared channel with the base unit via the base transceiver, in which each handset communicates during an exclusive time slot of a TDMA scheme that allocates time slots to handsets. The base receiver is characterized by a plurality of demodulation parameters and is for synchronizing with each handsets. The base receiver stores a set of demodulation parameters for each handset and switches to the set of demodulation parameters for a particular handset when the base unit is to synchronize with the particular handset.

Abstract: A wireless telephone system comprises a base transceiver having a base receiver and a plurality of wireless handsets. Each handset comprises a handset transceiver for establishing a DSSS link over a shared channel with the base unit via the base transceiver. Each receiver the base transceiver and the handset transceivers receives a spread-spectrum signal representing symbol data from a transmitter of the system, where each such receiver comprises a derotator that derotates the spread-spectrum signal in accordance with a counter-rotating signal to provide a derotated signal; a correlator for receiving the derotated signal and for providing output symbol data based on the derotated signal; a carrier tracking loop (CTL) phase error estimator for receiving the output symbol data and for generating a CTL phase error signal based upon the rotation of the spread-spectrum signal; and a CTL for generating the counter-rotating signal based on the CTL phase error signal.

Abstract: A receiver of a handset transceiver, in a wireless telephone system having a plurality of wireless handset and a base unit having a base transceiver. Each handset has a handset transceiver for establishing a time-division multiple access (TDMA) link over a shared channel with the base unit via the base transceiver, in which each handset communicates during an exclusive time slot of a TDMA scheme that allocates time slots to handsets during an exclusive time slot of a TDMA scheme that allocates time slots to active handsets for receiving a spread spectrum signal comprising successive chips representing successive symbols. Each receiver has one or more demodulation loops for demodulating the received spread spectrum signal, wherein each demodulation loop is characterized by one or more demodulation loop parameters. A parallel correlator of the receiver detects a peak bin and provides the peak bin and two adjacent bins.

Abstract: A wireless telephone system having a plurality of wireless handsets and a base unit, the base unit having a base transceiver. Each handset has a handset transceiver for establishing a wireless link over a shared channel with the base unit via the base transceiver, wherein the base transceiver transmits to a handset transceiver a first signal representing successive symbols at a first symbol rate. The handset transceiver has a receiver and a transmitter, and a local clock signal generator that provides clock signals at a local clock frequency. The receiver receives samples representing the first signal, and generates symbol error measurements used to cause a receiver interpolator to produce, in response to the received samples, samples taken at times synchronized to the successive symbols of the first signal.

Abstract: A wireless telephone system having a plurality of wireless handsets and a base unit, the base unit having a base transceiver. Each handset has a handset transceiver for establishing a wireless link over a shared channel with the base unit via the base transceiver, wherein the base transceiver transmits to a given handset transceiver a forward signal at a carrier frequency. Each handset transceiver has a receiver having a carrier tracking loop for detecting and removing a carrier offset from the forward signal; a transmitter for transmitting to the base transceiver a return signal; and an oscillator, independent of a base oscillator of the base transceiver on which the carrier frequency is based, for driving the receiver and transmitter of the handset. The handset transmitter comprises a prerotator that prerotates the return signal in accordance with the carrier offset detected by the carrier tracking loop so that the return signal will be received by the base transceiver with substantially no carrier offset.

Abstract: A wireless telephone system having a plurality of wireless, battery-powered handsets and a base unit, the base unit having a base transceiver. Each handset has a handset transceiver for establishing a wireless link over a shared channel with the base unit via the base transceiver, wherein the base transceiver transmits to a given handset transceiver a forward data message, which contains forward power level information identifying a forward power level at which the forward data message was transmitted by the base transceiver. The receiver receives and locks onto the forward data message. The transmitter transmits to the base transceiver a return data message at a return power level determined in accordance with the forward power level information.

Abstract: A wireless telephone system and related method are described, the system having a plurality of wireless handsets and a base unit, the base unit having a base transceiver, each handset having a handset transceiver for establishing a wireless link over a shared channel with the base unit via the base transceiver. The base unit transmits a signal comprising a current packet of a plurality of packets of an epoch. Each handset transceiver has a receiver having a parallel correlator for generating timing error signals and end-of-packet signals for the signal, and a timing loop for receiving the timing error signals and for establishing symbol-level timing synchronization. An enable resynch gate of the receiver receives the end-of-packet signals from the parallel correlator to establish packet-level synchronization, and a de-packetizer of the receiver reads epoch location information from the current packet which identifies the location of the current packet within the epoch.