Generation and processing of a variable-band modulated OFDM signal with auxiliary signalling
First Claim
1. A method for generating a variable-band OFDM (Orthogonal Frequency Division Multiplexing) signal, the method comprising:
- forming a modulating digital OFDM signal by;
associating at least two of a first plurality of components relating to user messages to be transmitted, a second plurality of components relating to signalling to be transmitted, a third plurality of components relating to pilot carriers to be transmitted so as to form a fourth plurality of componentscoding information about said variable-band OFDM signal so as to form a plurality of information components; and
repeatedly or periodically summing said information components about said variable-band OFDM signal with at least one of said first and second and third and fourth pluralities of components; and
modulating said modulating digital OFDM signal to output said variable-band OFDM signal.
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Accused Products
Abstract
A method for generating a variable-band modulated signal (x) where the modulating digital signal (X) of the modulated signal (x) includes at least one component (C, S, P); the digital information (r) about the variable band is repeatedly or periodically superimposed on the at least one component (C, S, P) or on the modulating signal (X). While processing the received modulated signal (x″), the modulated digital signal (X″) is extracted, the superimposed digital information (r) is obtained, and the extracted digital information (r) is used to determine the band of the modulated signal (x″) and to complete the demodulation and decoding of the modulated signal (x″).
12 Citations
22 Claims
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1. A method for generating a variable-band OFDM (Orthogonal Frequency Division Multiplexing) signal, the method comprising:
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forming a modulating digital OFDM signal by; associating at least two of a first plurality of components relating to user messages to be transmitted, a second plurality of components relating to signalling to be transmitted, a third plurality of components relating to pilot carriers to be transmitted so as to form a fourth plurality of components coding information about said variable-band OFDM signal so as to form a plurality of information components; and repeatedly or periodically summing said information components about said variable-band OFDM signal with at least one of said first and second and third and fourth pluralities of components; and modulating said modulating digital OFDM signal to output said variable-band OFDM signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for generating a variable-band OFDM (Orthogonal Frequency-Division Multiplexing) signal, wherein a modulating signal of said variable-band OFDM signal comprises a first plurality of components relating to user messages to be transmitted, a second plurality of components relating to signalling to be transmitted, a third plurality of components relating to pilot carriers to be transmitted, having an input for receiving information about said variable-band OFDM signal, said system comprising:
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a multiplexer for associating at least two of said first plurality of components and said second plurality of components and said third plurality of components to form a fourth plurality of components of said modulating signal, an encoder configured to code information about said variable-band OFDM signal to form a plurality of information components; and an OFDM modulator including an input, wherein said OFDM modulator receives said fourth plurality of components of said modulating signal and outputs said variable-band OFDM signal; wherein said plurality of information of information components are repeatedly or periodically summed with at least one of said first plurality of components, said second plurality of components, said third plurality of components, and said fourth plurality of components before said fourth plurality of components is modulated by said OFDM modulator and output as said variable-band OFDM signal.
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14. A method for processing a variable-band OFDM (Orthogonal Frequency Division Multiplexing) signal after having received the variable-band OFDM signal, wherein a modulating digital signal of said variable-band OFDM signal comprises a first plurality of components relating to user messages, a second plurality of components relating to signalling, a third plurality of components relating to pilot carriers, wherein at least two of said first plurality of components, said second plurality of components and said third plurality of components are associated to form a fourth plurality of components of said modulating digital signal, said method comprising the steps of:
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demodulating said variable-band OFDM signal to obtain said modulating digital signal; extracting, from said demodulated variable-band OFDM signal, information components about said variable-band OFDM signal summed with at least one of said first plurality of components, said second plurality of components, said third plurality of components, and said fourth plurality of components, wherein information about said variable-band OFDM signal was coded by an encoder to form said information components, deriving said information about said variable-band OFDM signal by decoding said information components, and using said derived information to determine a band of said variable-band OFDM signal and to complete the demodulation and decoding of said variable-band OFDM signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A system for processing a variable-band OFDM (Orthogonal Frequency-Division Multiplexing) signal after having received the variable-band OFDM signal, wherein a modulating digital signal of said OFDM signal comprises a first plurality of components relating to user messages, a second plurality of components relating to signalling, a third plurality of components relating to pilot carriers, wherein at least two of said first plurality of components, said second plurality of components, and said third plurality components are associated to form a fourth plurality of components of said modulating signal, said system comprising:
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a demodulator for demodulating said variable-band OFDM signal; means for extracting, from said demodulated variable-band OFDM signal, information components summed with at least one of said first and second and third and fourth pluralities of components, wherein digital information about said variable-band OFDM signal was coded by an encoder to form said information components, and means for deriving said digital information about said variable-band OFDM signal by decoding said information components, means for using said derived information to determine a band of said variable-band OFDM signal and to complete demodulation and decoding of said variable-band OFDM signal.
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Specification