Transmitter, receiver and transmitting method in multi-carrier transmission system
First Claim
1. A transmitter in a multi-carrier transmission system for conducting communications using a modulation method for dividing a transmission band into a plurality of sub-carriers and mapping each sub-carrier using a complex signal point expressed by k bits, comprising:
- an encoding unit converting transmitting data information, the number of bits of which is smaller than kn bits, which are data used to express n sub-carriers, into a signal point pattern, in which the peak power of a transmitting signal is small, of signal point patterns expressed by the kn bits, the encoding unit further comprising a sub-carrier generation unit generating sub-carriers composed of signal points in which the signal point pattern with a small peak power is divided into two orthogonal groups in four quadrants of an IQ plane and in which the signal point of the part of sub-carriers has a prescribed correlation with a signal point of another sub-carrier; and
a mapping unit generating transmitting signals of n sub-carriers using an output of the encoding unit.
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Accused Products
Abstract
An object of the present invention is to provide a method for suppressing peak power at a high encoding rate in a multi-carrier transmission system.
The present invention provides a transmitter for transmitting a multi-carrier signal, in which when generating 128 patterns used to suppress the peak power of 8-bit sub-carrier mapping signals from 7-bit information bits in a encoding unit 9, a sub-carrier generation unit 11, for example, divides the signal point of QPSK modulation into orthogonal groups, generates a sub-carrier mapping signal in which a part of sub-carriers is dependent on the signal point of another sub-carrier and a receiver for receiving such a multi-carrier signal.
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Citations
20 Claims
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1. A transmitter in a multi-carrier transmission system for conducting communications using a modulation method for dividing a transmission band into a plurality of sub-carriers and mapping each sub-carrier using a complex signal point expressed by k bits, comprising:
- an encoding unit converting transmitting data information, the number of bits of which is smaller than kn bits, which are data used to express n sub-carriers, into a signal point pattern, in which the peak power of a transmitting signal is small, of signal point patterns expressed by the kn bits, the encoding unit further comprising a sub-carrier generation unit generating sub-carriers composed of signal points in which the signal point pattern with a small peak power is divided into two orthogonal groups in four quadrants of an IQ plane and in which the signal point of the part of sub-carriers has a prescribed correlation with a signal point of another sub-carrier; and
a mapping unit generating transmitting signals of n sub-carriers using an output of the encoding unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- an encoding unit converting transmitting data information, the number of bits of which is smaller than kn bits, which are data used to express n sub-carriers, into a signal point pattern, in which the peak power of a transmitting signal is small, of signal point patterns expressed by the kn bits, the encoding unit further comprising a sub-carrier generation unit generating sub-carriers composed of signal points in which the signal point pattern with a small peak power is divided into two orthogonal groups in four quadrants of an IQ plane and in which the signal point of the part of sub-carriers has a prescribed correlation with a signal point of another sub-carrier; and
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8. A receiver in a multi-carrier transmission system for conducting communications using a modulation method for dividing a transmission band into a plurality of sub-carriers and mapping each sub-carrier using a complex signal point expressed by k bits, comprising:
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a demapping unit converting receiving signals obtained by converting transmitting data information, the number of bits of which is smaller than kn bits, which are data used to express n sub-carriers, into a signal point pattern, in which the peak power of a transmitting signal is small, of signal point patterns expressed by the kn bits and transmitted from a transmitting side;
a mapping signal generation unit generating all signal point patterns that might be transmitted from the transmitting side; and
a hard-decision decoding unit further comprising a comparison unit comparing signal point patterns of an output of the demapping unit with signal point patterns of an output of the mapping signal generation unit and an output unit outputting data corresponding to one signal point pattern, in which the signal point pattern outputted from the demapping unit and the signal point pattern outputted from the mapping signal generation unit are matched. - View Dependent Claims (9, 10)
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11. A receiver in a multi-carrier transmission system for conducting communications using a modulation method for dividing a transmission band into a plurality of sub-carriers and mapping each sub-carrier using a complex signal point expressed by k bits, comprising:
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a demapping unit converting a receiving signal obtained by converting transmitting data information, the number of bits of which is smaller than kn bits, which are data used to express n sub-carriers, into a signal point pattern, in which the peak power of a transmitting signal is small, of signal point patterns expressed by the kn bits and transmitted from a transmitting side by a sub-carrier composed of signal points in which the signal point pattern with small peak power is divided into two orthogonal groups in four quadrants of an IQ plane and in which a signal point of a part of sub-carriers has a prescribed correlation with a signal point of another sub-carrier, into a demapping signal used to be compared with all signal point patterns that might be transmitted from the transmitting side;
a transmission error detection unit detecting a transmission error when detecting a receiving signal that does not belong to any of the signal point patterns that might be transmitted from the transmitting side, of outputs of the demapping unit. - View Dependent Claims (12, 13, 15, 16)
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14. A receiver in a multi-carrier transmission system for conducting communications using a modulation method for dividing a transmission band into a plurality of sub-carriers and mapping each sub-carrier using a complex signal point expressed by k bits, comprising:
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a mapping unit mapping all signal point patterns that can be expressed by kn bits in relation to n sub-carriers and that might be transmitted from a transmitting side in order to convert the signal point patterns into respective transmitting signals of n sub-carriers, as in the transmitting side and outputting a transmission availability signal; and
a soft-decision decoding unit further comprising an output unit outputting a signal point pattern before the mapping of a transmission availability signal with the shortest code distance of code distances between a receiving signal obtained by converting transmitting data information, the number of bits of which is smaller than kn bits, which are data used to express n sub-carriers, into a signal point pattern, in which the peak power of a transmitting signal is small, of signal point patterns expressed by the kn bits and transmitted from a transmitting side by a sub-carrier composed of signal points in which the signal point pattern with small peak power can be divided into two orthogonal groups in four quadrants of an IQ plane and having a sub-carrier generation unit generating sub-carriers in which a signal point of a part of sub-carriers has a prescribed correlation with a signal point of another sub-carrier, and all the transmission availability signals as a decoding signal.
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17. A transmitting method in a multi-carrier transmission system for conducting communications using a modulation method for dividing a transmission band into a plurality of sub-carriers and mapping each sub-carrier using a complex signal point expressed by k bits, comprising:
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generating a sub-carrier composed of signal points in which the signal point pattern with small peak power can be divided into two orthogonal groups in four quadrants of an IQ plane and has a sub-carrier generation unit generating sub-carriers in which a signal point of a part of sub-carriers has a prescribed correlation with a signal point of another sub-carrier when converting receiving signals obtained by converting transmitting data information, the number of bits of which is smaller than kn bits, which are data used to express n sub-carriers, into a signal point pattern, in which the peak power of a transmitting signal is small, of signal point patterns expressed by the kn bits; and
generating transmitting signals by mapping the encoding result.
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18. A receiving method in a multi-carrier transmission system for conducting communications using a modulation method for dividing a transmission band into a plurality of sub-carriers and mapping each sub-carrier using a complex signal point expressed by k bits, comprising:
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converting a receiving signal obtained by converting transmitting data information, the number of bits of which is smaller than kn bits, which are data used to express n sub-carriers, into a signal point pattern, in which the peak power of a transmitting signal is small, of signal point patterns expressed by the kn bits and transmitted from a transmitting side by a sub-carrier composed of signal points in which the signal point pattern with small peak power can be divided into two orthogonal groups in four quadrants of an IQ plane and having a sub-carrier generation unit generating sub-carriers in which a signal point of a part of sub-carriers has a prescribed correlation with a signal point of another sub-carrier, into demapping signals (demapping step);
generating all signal point patterns that might be transmitted from the transmitting side (mapping signal generation step); and
comparing signal point patterns of an output of the demapping step and signal point patterns of an output of the mapping signal generation step (comparison step) and outputting the transmitting data information corresponding to one signal point pattern, in which the signal point pattern outputted from the demapping unit and the signal point pattern outputted from the mapping signal generation unit are matched, as a decoding data signal.
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19. A receiving method in a multi-carrier transmission system for conducting communications using a modulation method for dividing a transmission band into a plurality of sub-carriers and mapping each sub-carrier using a complex signal point expressed by k bits, comprising:
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mapping all signal point patterns that can be expressed by kn bits in relation to n sub-carriers and that might be transmitted from a transmitting side in order to convert the signal point patterns into respective transmitting signals of n sub-carriers, as in the transmitting side and outputting a transmission availability signal (mapping step); and
outputting the signal point pattern before mapping of the transmission availability signal with the shortest code distance of code distances between a receiving signal obtained by converting transmitting data information, the number of bits of which is smaller than kn bits, which are data used to express n sub-carriers, into the signal point pattern, in which the peak power of a transmitting signal is small, of signal point patterns expressed by the kn bits and transmitted from a transmitting side by a sub-carrier composed of signal points in which the signal point pattern with small peak power can be divided into two orthogonal groups in four quadrants of an IQ plane and having a sub-carrier generation sub-unit generating sub-carriers in which the signal point of a part of sub-carriers has a prescribed correlation with the signal point of another sub-carrier, and all the transmission availability signals as a decoding signal (output step) (soft-decision decoding step).
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20. A transmitter in a multi-carrier transmission system for conducting communications using a modulation method for dividing a transmission band into a plurality of sub-carriers and mapping each sub-carrier using a complex signal point expressed by k bits, comprising:
an encoding unit converting transmitting data information, the number of bits of which is smaller than kn bits, which are data used to express n sub-carriers, into a signal point pattern, in which the peak power of a transmitting signal is small, of signal point patterns expressed by the 2 k bits, the encoding unit further comprising a sub-carrier generation unit generating the sub-carrier in which the signal point with small peak power can be divided into two orthogonal groups in four quadrants of an IQ plane and in which the signal point of a part of sub-carriers has a prescribed correlation with the signal point of another sub-carrier.
Specification