Method to increase performance of secondary data in a heirarchial modulation scheme
First Claim
1. In a digital data transmission system including a transmitter for transmitting signals, a terrestrial repeater comprising:
- a receiving unit for detecting a first transmit signal and a second transmit signal, the first transmit signal transmitted from a first communication satellite and produced when the transmitter modulates a primary and a secondary data on a first carrier wave associated with the first communication satellite, and the second transmit signal transmitted from a second communication satellite and produced when the transmitter modulates the primary and the secondary data on a second carrier wave associated with the second communication satellite;
an encoder for re-encoding the primary and the secondary data on a third carrier wave to form a third transmit signal; and
a re-transmitter for transmitting the third transmit signal to a receiver.
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Accused Products
Abstract
This invention provides a receiver for use in a SDAR system which includes a receiving unit having satellite signal detection means for detecting a first transmit signal transmitted from a first communication satellite and a second transmit signal transmitted from a second communication satellite, the first transmit signal produced when the transmitter modulates a primary data stream with a secondary data stream on a first carrier wave associated with the first communication satellite and the second transmit signal produced when the transmitter modulates the primary and secondary data streams on a second carrier wave associated with the second communication satellite, and an encoder re-encodes the primary and the secondary data on a third carrier wave, forming a third transmit signal which is re-transmitted to a receiver using a terrestrial repeater. This invention also provides a method of receiving transmitted data.
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Citations
22 Claims
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1. In a digital data transmission system including a transmitter for transmitting signals, a terrestrial repeater comprising:
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a receiving unit for detecting a first transmit signal and a second transmit signal, the first transmit signal transmitted from a first communication satellite and produced when the transmitter modulates a primary and a secondary data on a first carrier wave associated with the first communication satellite, and the second transmit signal transmitted from a second communication satellite and produced when the transmitter modulates the primary and the secondary data on a second carrier wave associated with the second communication satellite;
an encoder for re-encoding the primary and the secondary data on a third carrier wave to form a third transmit signal; and
a re-transmitter for transmitting the third transmit signal to a receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22)
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21. In a satellite audio radio service system, a method for receiving transmitted data, the method comprising the steps of:
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receiving a primary data stream and a secondary data stream from both a first communication satellite and a second communication satellite, the primary data stream having a first data rate and the secondary data stream having a second data rate;
determining the validity of said first and said second data streams; and
hierarchically modulating the primary and the secondary data streams to form a combined data stream when the secondary data stream is determined to be an enhancement to the primary data stream, wherein the combined data stream has a third data rate greater than the first data rate.
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Specification