Low peak-to-average power ratio transmission in frequency-division multiple access systems
First Claim
1. A method for communication, comprising:
- in a multiple-access communication system that uses a plurality of subcarriers, allocating first subcarriers within the plurality to a first communication terminal for transmitting first data, and second subcarriers within the plurality to a second communication terminal for transmitting second data;
assigning the first communication terminal to modulate the first data onto at least some of the first subcarriers using a first multi-carrier modulation scheme to produce a first signal, wherein the first multi-carrier modulation scheme modulates data bits onto data symbols, and modulates the modulated data symbols onto the subcarriers with a first peak-to-average power ratio (PAPR) when modulating a first given number of the data bits and a second given number of the subcarriers;
assigning the second communication terminal to modulate the second data onto at least some of the second subcarriers using a second multi-carrier modulation scheme, so as to produce a second signal, wherein the second multi-carrier modulation scheme modulates the data bits onto the data symbols, and modulates the modulated data symbols onto the subcarriers with a second PAPR, less than the first PAPR, when modulating the same first given number of the data bits and the same second given number of the subcarriers; and
communicating simultaneously with the first and second communication terminals by simultaneously receiving the first and second signals over the first and second subcarriers.
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Accused Products
Abstract
A method for communication includes allocating, in a multiple-access communication system (20) that uses multiple subcarriers, first subcarriers to a first communication terminal for transmitting first data, and second subcarriers to a second communication terminal for transmitting second data. The first communication terminal is assigned to modulate the first data onto at least some of the first subcarriers using a first multi-carrier modulation scheme, to produce a first signal. The second communication terminal is assigned to modulate the second data onto at least some of the second subcarriers using a second multi-carrier modulation scheme, which has a reduced peak-to-average power ratio (PAPR) relative to the first multi-carrier modulation scheme, to produce a second signal. Simultaneous communication is carried out with the first and second communication terminals by simultaneously receiving the first and second signals over the first and second subcarriers.
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Citations
32 Claims
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1. A method for communication, comprising:
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in a multiple-access communication system that uses a plurality of subcarriers, allocating first subcarriers within the plurality to a first communication terminal for transmitting first data, and second subcarriers within the plurality to a second communication terminal for transmitting second data; assigning the first communication terminal to modulate the first data onto at least some of the first subcarriers using a first multi-carrier modulation scheme to produce a first signal, wherein the first multi-carrier modulation scheme modulates data bits onto data symbols, and modulates the modulated data symbols onto the subcarriers with a first peak-to-average power ratio (PAPR) when modulating a first given number of the data bits and a second given number of the subcarriers; assigning the second communication terminal to modulate the second data onto at least some of the second subcarriers using a second multi-carrier modulation scheme, so as to produce a second signal, wherein the second multi-carrier modulation scheme modulates the data bits onto the data symbols, and modulates the modulated data symbols onto the subcarriers with a second PAPR, less than the first PAPR, when modulating the same first given number of the data bits and the same second given number of the subcarriers; and communicating simultaneously with the first and second communication terminals by simultaneously receiving the first and second signals over the first and second subcarriers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 29, 30)
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16. A base station in a multiple-access communication system that uses a plurality of subcarriers, the base station comprising:
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a controller, which is arranged to allocate first subcarriers within the plurality to a first communication terminal for transmitting first data, and second subcarriers within the plurality to a second communication terminal for transmitting second data, to assign the first communication terminal to modulate the first data onto at least some of the first subcarriers using a first multi-carrier modulation scheme to produce a first signal, wherein the first multi-carrier modulation scheme modulates data bits onto data symbols, and modulates the modulated data symbols onto the subcarriers with a first peak-to-average power ratio (PAPR) when modulating a first given number of the data bits and a second given number of the subcarriers, and to assign the second communication terminal to modulate the second data onto at least some of the second subcarriers using a second multi-carrier modulation scheme, so as to produce a second signal, wherein the second multi-carrier modulation scheme modulates the data bits onto the data symbols, and modulates the modulated data symbols onto the subcarriers with a second PAPR, less than the first PAPR, when modulating the same first given number of the data bits and the same second given number of the subcarriers; a transmitter, which is arranged to respectively communicate the allocated first and second subcarriers to the first and second communication terminals; and a receiver, which is arranged to communicate simultaneously with the first and second communication terminals by simultaneously receiving the first and second signals over the first and second subcarriers. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 31, 32)
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28. A multiple-access communication system that uses a plurality of subcarriers, the system comprising:
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a base station, which is arranged to allocate first subcarriers within the plurality for transmission using a first multi-carrier modulation scheme, wherein the first multi-carrier modulation scheme modulates data bits onto data symbols, and modulates the modulated data symbols onto the subcarriers with a first peak-to-average power ratio (PAPR) when modulating a first given number of the data bits and a second given number of the subcarriers, to allocate second subcarriers within the plurality for transmission using a second multi-carrier modulation scheme, wherein the second multi-carrier modulation scheme modulates the data bits onto the data symbols, and modulates the modulated data symbols onto the subcarriers with a second PAPR, less than the first PAPR, when modulating the same first given number of the data bits and the same second given number of the subcarriers, to respectively communicate the allocated first and second subcarriers to the first and second communication terminals, and to simultaneously receive uplink data respectively transmitted using the first and second multi-carrier modulation schemes over the first and second subcarriers; a first communication terminal, which is arranged to modulate first data onto at least some of the first subcarriers within the plurality using the first multi-carrier modulation scheme to produce a first signal, and to transmit the first signal to the base station; and a second communication terminal, which is arranged to modulate second data onto at least some of the second subcarriers within the plurality using the second multi-carrier modulation scheme to produce a second signal, and to transmit the second signal to the base station.
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Specification