Method to increase performance of secondary data in a hierarchical modulation scheme
First Claim
1. In a digital data transmission system including a transmitter for transmitting transmit signals, a receiver comprising:
- a receiving unit including 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
at least one demodulator coupled to said receiving unit and configured to demodulate at least one of the first and the second transmit signals.
5 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides a receiver for use in a SDAR system, the receiver including 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 at least one demodulator coupled to the receiving unit and configured to demodulate the at least one of the first and the second transmit signals.
-
Citations
53 Claims
-
1. In a digital data transmission system including a transmitter for transmitting transmit signals, a receiver comprising:
-
a receiving unit including 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
at least one demodulator coupled to said receiving unit and configured to demodulate at least one of the first and the second transmit signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A method of receiving transmitted data, the method comprising the steps of:
-
detecting a first transmit signal, the first transmit signal transmitted from a first communication satellite and comprising a first level data and a second level data modulated on a first carrier wave associated with the first communication satellite;
detecting a secorid transmit signal, the second transmit signal transmitted from a second communication satellite and comprising the first level data and the second level data modulated on a second carrier wave associated with the second communication satellite;
interpreting the first transmit signal; and
providing the interpreted signal to an output unit. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
-
-
32. 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. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
-
-
52. In a satellite audio radio service system, a method for receiving transmitted data, the method comprising the steps of:
-
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. - View Dependent Claims (53)
-
Specification