Signal processing method for terrestrial repeater
First Claim
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1. A signal processing method for allowing a repeater to transmit a signal received from an external apparatus to a terminal, the method comprising:
- at the external apparatus, transmitting a modulated signal, which is modulated in the form of a low order modulation symbol including basic information bits, to the terminal or the repeater;
at the repeater, generating a second modulated signal, which is modulated in the form of a high order modulation symbol including the basic information bits, which is recovered from the modulated signal received from the external apparatus, and additional information bits and transmitting the generated signal to the terminal; and
at the terminal, recovering information by combining or selecting the signal received from the external apparatus or the signal received from the repeater,wherein the recovering of the information bits comprises;
performing a soft decision bit demodulation based on a highest modulation order of all signals received by the terminal; and
determining information bits, which is to be recovered, according to a relative difference between soft decision bit values that are obtained through the soft decision bit demodulation.
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Abstract
A signal processing technology for allowing a repeater to transmit a signal received from an external apparatus to a terminal is provided. In a satellite system, a signal transmitted from a satellite or transmitted to a satellite is subject to a low order modulation, and a terrestrial repeater performs a high order modulation on signals and retransmits the signals.
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Citations
14 Claims
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1. A signal processing method for allowing a repeater to transmit a signal received from an external apparatus to a terminal, the method comprising:
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at the external apparatus, transmitting a modulated signal, which is modulated in the form of a low order modulation symbol including basic information bits, to the terminal or the repeater; at the repeater, generating a second modulated signal, which is modulated in the form of a high order modulation symbol including the basic information bits, which is recovered from the modulated signal received from the external apparatus, and additional information bits and transmitting the generated signal to the terminal; and at the terminal, recovering information by combining or selecting the signal received from the external apparatus or the signal received from the repeater, wherein the recovering of the information bits comprises; performing a soft decision bit demodulation based on a highest modulation order of all signals received by the terminal; and determining information bits, which is to be recovered, according to a relative difference between soft decision bit values that are obtained through the soft decision bit demodulation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A signal processing method for allowing a terrestrial repeater to transmit a signal received from a satellite to a terminal, the method comprising:
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at the satellite, receiving a modulated signal which is modulated in the form of a Quadrature Phase Shift Keying (QPSK) symbol including basic information bits; at the satellite, transmitting the modulated signal which is modulated in the form of a QPSK symbol including the basic information bits to the terminal or the terrestrial repeater; at the terrestrial repeater, generating a second signal which is modulated in the form of a 16-Quadrature Amplitude Modulation (16-QAM) symbol including the basic information bits, which are recovered from the modulated signal received from the satellite, and additional information bits and then transmitting the generated signal; and at the terminal, recovering information by combining or selecting the signal that is received from the satellite or the signal that is received from the terrestrial repeater, wherein the recovering of the information bits comprises; performing a soft decision bit demodulation based on a highest modulation order of all signals received by the terminal; and determining information bits, which is to be recovered, according to a relative difference between soft decision bit values that are obtained through the soft decision bit demodulation. - View Dependent Claims (11, 12, 13, 14)
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Specification