Method and apparatus for analyzing a composite carrier signal
First Claim
1. A communication system for transmitting a composite carrier signal, comprising:
- a coder for coding a plurality of information signals according to a coding technique to produce a corresponding plurality of coded baseband signals; and
a processor for processing said plurality of coded baseband signals to form a simulated composite carrier signal and for analyzing said simulated composite carrier signal based on peak-to-average amplitude ratio requirements, wherein said simulated composite carrier signal has characteristics of an actual composite carrier signal that would have resulted if said plurality of coded baseband signals had been combined, wherein said processor produces a coding technique assignment control signal to vary and select said coding technique in said coder, wherein said processor repeatedly varies and selects, through said coding technique assignment control signal, coding techniques in said coder until at least one coding technique is identified for producing an acceptable set of said coded baseband signals based on whether the peak-to-average amplitude ratio of said simulated composite carrier signal is within said predetermined limit.
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Accused Products
Abstract
A communication system receives and codes a plurality of information signals according to coding assignments to produce a plurality of coded baseband signals. From these signals, a simulated composite carrier signal is formed which has all the characteristics of an actual composite carrier signal which would have resulted if the plurality of coded baseband signals had been formed. The simulated composite carrier signal is analyzed to determine its peak-to-average ratio. The communication system selects a different coding assignments for coding the plurality of information signals if, based on the determined peak-to-average ratio and a selection criteria, the coding assignment does not produce the desired results. The communication system selects a different coding assignments until at least one or several desired coding techniques have been identified, ranks the coding techniques and makes a final selection of the coding technique to meet the peak-to-average ratio requirements.
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Citations
18 Claims
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1. A communication system for transmitting a composite carrier signal, comprising:
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a coder for coding a plurality of information signals according to a coding technique to produce a corresponding plurality of coded baseband signals; and a processor for processing said plurality of coded baseband signals to form a simulated composite carrier signal and for analyzing said simulated composite carrier signal based on peak-to-average amplitude ratio requirements, wherein said simulated composite carrier signal has characteristics of an actual composite carrier signal that would have resulted if said plurality of coded baseband signals had been combined, wherein said processor produces a coding technique assignment control signal to vary and select said coding technique in said coder, wherein said processor repeatedly varies and selects, through said coding technique assignment control signal, coding techniques in said coder until at least one coding technique is identified for producing an acceptable set of said coded baseband signals based on whether the peak-to-average amplitude ratio of said simulated composite carrier signal is within said predetermined limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A communication system for transmitting a composite carrier signal, comprising:
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a speech coder for coding a plurality of speech signals according to a speech coding assignment to produce a corresponding speech coded baseband signals; a speech decoder for decoding said speech coded baseband signals according to a speech decoding assignment to produce a corresponding transformed baseband signals; and a processor for processing said plurality of transformed baseband signals to form a simulated composite carrier signal and for analyzing said simulated composite carrier signal based on peak-to-average amplitude ratio requirements, wherein said simulated composite carrier signal has characteristics of an actual composite carrier signal that would have resulted from said plurality of transformed signals, wherein said processor produces a speech coding assignment control signal to vary and select said speech coding assignment in said speech coder and a speech decoding assignment control signal to vary and select said speech decoding assignment in said speech decoder, wherein said processor repeatedly varies and selects, through either said speech coding, or said speech decoding, assignment control signals, different speech coding, or decoding, assignments in said speech coder, or decoder, until at least a speech coding, or decoding, or a pair of coding and decoding, assignments are identified, respectively, for producing an acceptable set of said transformed baseband signals based on whether the peak-to-average amplitude ratio of said simulated composite carrier signal is within said predetermined limit. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of analyzing a signal to be transmitted, the method comprising the steps of:
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simulating a modulation of a plurality of separate signals with a corresponding plurality of modulation codes to produce a plurality of separate simulated signals; analyzing the plurality of separate simulated signals based on predetermined criteria related to a peak-to-average ratio of a composite signal comprised of a combination of the separate simulated signals; varying at least one modulation code when the composite signal comprised of a combination of the separate simulated signals is greater than a predetermined peak-to-average ratio threshold. - View Dependent Claims (17, 18)
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Specification