Backward compatible multi-carrier transmission system
First Claim
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1. A multi-carrier transmission system for transmitting information signals over a set of carriers, the set of carriers comprising a sub-set of carriers, denoted sub-carriers, and modulating each sub-carrier according to a modulation, comprising:
- a mapper configured to modulate each sub-carrier using a first constellation to convey additional information signals; and
a signal block configured to modulate each sub-carrier using a second constellation to convey parameter signaling signals,wherein the real parts of complex symbols of the modulation are proportional to a combination of the real parts of complex symbols of the first constellation with the real parts of complex symbols of the second constellation, the complex parts of the complex symbols of the modulation being proportional to the complex parts of the complex symbols of the first constellation.
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Abstract
The transmission system is backward compatible with a former transmission system (DVB-T), enabling a receiver of the former system to receive signals transmitted by a transmitter of the new transmission system. A new modulation is used to transmit additional information bits corresponding to a new service. The new modulation is specified by a combination of the former modulation with a new-built over modulation.
17 Citations
11 Claims
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1. A multi-carrier transmission system for transmitting information signals over a set of carriers, the set of carriers comprising a sub-set of carriers, denoted sub-carriers, and modulating each sub-carrier according to a modulation, comprising:
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a mapper configured to modulate each sub-carrier using a first constellation to convey additional information signals; and a signal block configured to modulate each sub-carrier using a second constellation to convey parameter signaling signals, wherein the real parts of complex symbols of the modulation are proportional to a combination of the real parts of complex symbols of the first constellation with the real parts of complex symbols of the second constellation, the complex parts of the complex symbols of the modulation being proportional to the complex parts of the complex symbols of the first constellation. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10, 11)
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6. A multi-carrier transmission method for transmitting information signals over a set of carriers, the set of carriers comprising a sub-set of carriers, denoted sub-carriers and modulating each sub-carrier according to a modulation, comprising:
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modulating each sub-carrier using a first constellation to convey additional information signals at a multi-carrier transmission system; and modulating each sub-carrier using a second constellation to convey parameter signaling signals at the multi-carrier transmission system, wherein the real parts of complex symbols of the modulation are proportional to a combination of the real parts of complex symbols of the first constellation with the real parts of complex symbols of the second constellation, the complex parts of the complex symbols of the modulation being proportional to the complex parts of the complex symbols of the first constellation. - View Dependent Claims (7)
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Specification