Back to results
US 5,970,085 AGranted
Method and receiver for coded satellite digital audio broadcasting
AssigneeOrbital Sciences Corporation
InventorByung Kwan Yi
Life of this patent
Estimating the term…
Abstract
A system and method for broadcasting an audio signal in a turbo-coded satellite digital audio broadcasting system is provided that utilizes the combination of a turbo coding system having code combining and code diversity techniques to lower the power required for transmittal and to transmit at a higher code rate of 1/4 by utilizing the puncturing sequence and a pilot signal assisted orthogonal CDMA; the invention includes an improved receiver system that uses modified RAKE receivers in order to mitigate the Rayleigh multipath fading, shadowing, and temporal blockage and improve performance. The invention further uses a terrestrial gap filler network having a reduced amount of gap fillers.
Claims20
A digital receiver comprising:
- receiver circuitry for processing received modulated signals to obtain first and second data streams if contained within currently received signals;
- a first demultiplexer, coupled to an output of the receiver circuitry, for processing the first data stream if received to recover digital data corresponding to digital source information and a first coded sequence;
- a second demultiplexer, coupled to an output of the receiver circuitry, for processing the second data stream if received to recover digital data corresponding to interleaved digital source information and a second coded sequence;
- a code combiner, coupled to the first and second demultiplexers, for processing the first and second code sequences if available, to recover a first turbo encoded sequence corresponding to the digital source information and a second turbo encoded sequence corresponding to the interleaved digital source information;
- and
- an intelligent turbo decoder for recovering an accurate representation of the digital source information from an available two or more of:
- the digital data corresponding to the digital source information, the first turbo encoded sequence, the digital data corresponding to the interleaved digital source information, and the second turbo encoded sequence.
4 more elements
A product comprising a machine readable medium bearing sequences of digital code, said sequences digital code comprising:
- a first multiplexed data stream containing digital source information and a first encoded sequence;
- and
- a second multiplexed data stream containing interleaved digital source information and a second encoded sequence, wherein:
- the first encoded sequence comprises a combination of selected portions of a first turbo code derived from the digital source information and selected portions of a second turbo code derived from the interleaved source information, and
- the second encoded sequence comprises a combination of alternate portions of the first turbo code derived from the digital source information and alternate portions of a second turbo code derived from the interleaved source information.
2 more elements
A receiver for receiving and decoding digital data, wherein said digital data comprises:
- a first multiplexed data stream containing digital source information and a first encoded sequence;
- and
- a second multiplexed data stream containing interleaved digital source information and a second encoded sequence, wherein:
- the first encoded sequence comprises a combination of selected portions of a first turbo code derived from the digital source information and selected portions of a second turbo code derived from the interleaved source information, and
- the second encoded sequence comprises a combination of alternate portions of the first turbo code derived from the digital source information and alternate portions of a second turbo code derived from the interleaved source information,
- said receiver comprising:
- (a) processing circuitry for recovering the first data stream if contained in received broadcast signals and for recovering the second data stream if contained in the received broadcast signals;
- and
- (b) an intelligent turbo decoder coupled to the processing circuitry, for decoding the first and second data streams to recover a representation of the digital source information if both data streams are received, and for decoding either the first data stream or the second data stream to recover a representation of the digital source information if only one of the data streams are received.
6 more elements
A receiver for receiving and decoding digital data, comprising:
- receiver circuitry for processing received modulated signals from one or both of a first channel and a second channel, to recover digital data corresponding to digital source information and a first coded sequence if the first channel is received, and to recover digital data corresponding to interleaved digital source information and a second coded sequence if the second channel is received;
- a code combiner, coupled to the receiver circuitry, for processing the first and second code sequences if available, to recover a first turbo encoded sequence corresponding to the digital source information and a second turbo encoded sequence corresponding to the interleaved digital source information;
- a first decoder, coupled to the code combiner, for processing data corresponding to the digital source information and to the first turbo encoded sequence to produce a first estimation;
- a packet combiner for forming a ratio as a function of the first estimation and data corresponding to the interleaved digital source information;
- and
- a second decoder for producing a second estimation from an output of the packet combiner and an output of the code combiner corresponding to the second turbo encoded sequence and outputting the second estimation.
3 more elements
A digital receiver comprising:
- receiver circuitry for processing received modulated signals from one or both of a first channel and a second channel, to recover digital data corresponding to digital source information and a first coded sequence if the first channel is received, and to recover digital data corresponding to interleaved digital source information and a second coded sequence if the second channel is received;
- a code combiner, coupled to the receiver circuitry, for processing the first and second code sequences if available, to recover a first turbo encoded sequence corresponding to the digital source information and a second turbo encoded sequence corresponding to the interleaved digital source information;
- and
- an intelligent turbo decoder for recovering an accurate representation of the digital source information from an available two or more of:
- the digital data corresponding to the digital source information, the first turbo encoded sequence, the digital data corresponding to the interleaved digital source information, and the second turbo encoded sequence.
2 more elements
Dependencies are inferred from the claim text.