摘要:
A system and method for communicating and re-using frequencies is provided, which includes a source provider, at least one transmitter, and a plurality of antennas. The transmitter transmits source data along a plurality of signal paths including a first signal at a first frequency transmitted along a first satellite signal path, a second signal at a second frequency transmitted along a second satellite signal path, and a terrestrial signal transmitted along a terrestrial signal path. The terrestrial signal frequency is substantially the same as one of the first and second signal frequencies. The antennas receive signals, and include a first antenna for receiving at least the terrestrial signal along the terrestrial signal path and a second antenna for receiving at least the first signal along the first satellite signal path, the second signal along the second satellite signal path, and the terrestrial signal along the terrestrial signal path.
摘要:
A communication system and method of communicating signals to a plurality of different types of receivers is provided. The communication system includes at least one transmitter that transmits high priority and low priority signals as a single frequency network. At least one satellite receives and re-transmits at least one of the high priority and low priority signals. At least one terrestrial repeater is in communication with the at least one transmitter, and receives from the at least one transmitter and re-transmits at least one of the high priority and low priority signals. A plurality of receivers includes at least a first receiver configured to process the high priority signal to emit an output signal based upon the high priority signal, and a second receiver configured to process the high priority and low priority signals to emit an output signal based upon the high priority and low priority signals.
摘要:
A communication system and method of communicating signals to a plurality of different types of receivers is provided. At least one transmitter transmits hierarchically modulated high priority and low priority signals as a single frequency network. At least one satellite re-transmits the high priority signal in a first circularly polarized direction and the low priority signal in a second circularly polarized direction. At least one of a first receiver having a single antenna is configured to receive the high priority signal in the first circularly polarized direction and switched to receive the low priority signal in the second circularly polarized direction, and a second receiver having a first antenna is configured to receive the high priority signal in the first circularly polarized direction, and a second antenna is configured to receive the low priority signal in the second circularly polarized direction substantially simultaneously.
摘要:
A communication system and method of communicating signals to a plurality of different types of receivers is provided. The communication system includes at least one transmitter that transmits a high priority signal and a low priority signal that are hierarchically modulated and transmitted as a single frequency network. At least one satellite receives and re-transmits at least one of the high priority and low priority signals. At least one of the plurality of receivers include a processor that performs the steps of storing the hierarchically modulated signal, demodulating the high priority signal from the hierarchically modulated signal, decoding the demodulated high priority signal, re-encoding the high priority signal, and processing the stored hierarchically modulated signal based upon the re-encoded high priority signal.
摘要:
A method and system for communicating satellite digital radio program information for multiple satellite channels is provided. The method includes the steps of providing multiple satellite signals, and providing multiple data frames in each of the satellite signals. The method also includes the steps of providing frame synchronization symbols in each of the data frames, such that the frame synchronization symbols occurring in the satellite signals do not overlap in time with each other. The method also includes the steps of providing multiple data slots within each of the data frames, and providing satellite program information in at least one of the data slots in each data frame. The multiple data slots are positioned within each data frame relative to the frame synchronization symbol of that data frame, such that the data slots containing satellite program information in the multiple satellite signals do not overlap in time with each other.
摘要:
A communications system and method thereof are provided, wherein the system includes a first receiver. The first receiver includes at least one antenna element configured to receive the first signal having a first polarization, and a combiner in communication with the at least one antenna element, wherein the combiner enhances the first signal and minimizes a second signal having a second polarization that is different than the first polarization of the first signal, such that an output is emitted by the first receiver based upon the received first signal. The first receiver further includes a beam steerer in communication with the combiner, wherein the beam steerer is configured to steer an antenna beam of the at least one antenna element in order to minimize reflection of the second signal, such that the second polarization of the second signal remains different than the first polarization of the first signal.
摘要:
A technique for providing secondary data in a single frequency network (SFN) provides a first forward error correcting (FEC) decoder for decoding a received coded orthogonal frequency division multiplex (COFDM) signal. A second FEC decoder is also provided for decoding a received COFDM signal. When the received COFDM signal includes valid primary data, the first FEC decoder is utilized to decode the received COFDM signal to provide general information, i.e., music, sports, etc. When a received COFDM signal includes valid secondary data, the second FEC decoder is utilized to decode the received COFDM signal to provide regional information, e.g., emergency broadcasting information. The received COFDM signal includes one or more defined COFDM symbols inserted by a transmitter of the COFDM signal to indicate the valid secondary data and the invalid primary data.
摘要:
A system and method of multi-source communications, including a source provider, a transmitter, a receiver, a summing device, a plurality of delay devices, and a switch. The source provider provides a signal including a first and second signal. The transmitter is in communication with the source provider and the receiver. The receiver is in communication with the transmitter. The summing device combines the first and second signals received by the receiver. The delay device delays at least one of the first and second signals. The switch forms a bypass, such that at least one of the first and second signals bypasses one of the plurality of delay devices.
摘要:
A technique for determining a tuning frequency of an audio receiver includes interrupting a received radio frequency (RF) signal at an input of the audio receiver. Next, a modulated audio signal is injected into the input of the audio receiver. Then, it is determined whether the demodulated audio signal is present at an output of the audio receiver. If not, the frequency of the modulated audio signal is changed until the demodulated audio signal is detected at the output of the audio receiver.
摘要:
High priority data and low priority digital data are transmitted as primary and secondary data in hierarchically modulated, orthogonal frequency division multiplexing (OFDM) from an earth-orbiting satellite. To enable the transmitter amplifier to be operated with less back-off from saturation without clipping, the low priority OFDM symbols have fewer samples than the high priority OFDM symbols, and the high priority samples on which the low priority samples are superimposed are selected according to a first deterministic rule using sample power comparisons of the high priority samples to concentrate the low priority samples on those high priority samples having lower (optimally, the lowest) sample power. The low priority samples are distributed on the selected high priority samples according to a second deterministic rule relating the original low priority sample order to the original high priority sample order.