Signaling method in an OFDM multiple access system
First Claim
1. An apparatus for generating a vector of digital signal samples (S), the apparatus comprising:
- a discrete Fourier transform (DFT) hardware module configured to receive a discrete signal of complex data symbols (C), calculate frequency responses (A1, . . . AM) corresponding to tones (f(1), . . . f(M)), through an M-point DFT, and output a vector [A1, . . . AM] of length M;
a zero insertion circuit configured to expand the vector to a new vector of length N, andinsert zero-value symbols corresponding to tones other than tones allocated to a transmitter; and
an inverse discrete Fourier transform (IDFT) circuit configured to perform an N-point inverse discrete Fourier transform operation on the new vector after zero insertion to obtain the vector of digital signal samples (S), and to generate a low peak-to-average OFDM-based signal using the vector of digital signal samples (S) for transmission.
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Abstract
A method for reducing the peak-to-average ratio in an OFDM communication signal is provided. The method includes defining a constellation having a plurality of symbols, defining a symbol duration for the OFDM communication signal, and defining a plurality of time instants in the symbol duration. A plurality of tones are allocated to a particular communication device, and a discrete signal is constructed in the time domain by mapping symbols from the constellation to the time instants. A continuous signal is generated by applying an interpolation function to the discrete signal such that the continuous signal only includes sinusoids having frequencies which are equal to the allocated tones.
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Citations
112 Claims
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1. An apparatus for generating a vector of digital signal samples (S), the apparatus comprising:
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a discrete Fourier transform (DFT) hardware module configured to receive a discrete signal of complex data symbols (C), calculate frequency responses (A1, . . . AM) corresponding to tones (f(1), . . . f(M)), through an M-point DFT, and output a vector [A1, . . . AM] of length M; a zero insertion circuit configured to expand the vector to a new vector of length N, and insert zero-value symbols corresponding to tones other than tones allocated to a transmitter; and an inverse discrete Fourier transform (IDFT) circuit configured to perform an N-point inverse discrete Fourier transform operation on the new vector after zero insertion to obtain the vector of digital signal samples (S), and to generate a low peak-to-average OFDM-based signal using the vector of digital signal samples (S) for transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for generating a vector of digital signal samples (S), the apparatus comprising:
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a discrete Fourier transform (DFT) hardware module configured to receive a discrete signal of complex data symbols (C), calculate frequency responses (A1, . . . AM) corresponding to tones (f(1), . . . f(M)), through an M-point DFT, and output a vector [A1, . . . AM] of length M; a zero insertion hardware module configured to expand the vector to a new vector of length N, and insert zero-value symbols corresponding to tones other than tones allocated to a transmitter; and an inverse discrete Fourier transform (IDFT) circuit configured to perform an N-point inverse discrete Fourier transform operation on the new vector after zero insertion to obtain the vector of digital signal samples (S), and to generate a low peak-to-average OFDM-based signal using the vector of digital signal samples (S) for transmission. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. An apparatus for generating a vector of digital signal samples (S), the apparatus comprising:
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a discrete Fourier transform (DFT) hardware module configured to receive a discrete signal of complex data symbols (C), calculate frequency responses (A1, . . . AM) corresponding to tones (f(1), . . . f(M)), through an M-point DFT, and output a vector [A1, . . . AM] of length M; a zero insertion hardware module configured to expand the vector to a new vector of length N, and insert zero-value symbols corresponding to tones other than tones allocated to a transmitter; and an inverse discrete Fourier transform (IDFT) hardware module configured to perform an N-point inverse discrete Fourier transform operation on the new vector after zero insertion to obtain the vector of digital signal samples (S), and to generate a low peak-to-average OFDM-based signal using the vector of digital signal samples (S) for transmission. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. An apparatus for generating a vector of digital signal samples (S), the apparatus comprising:
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a discrete Fourier transform (DFT) circuit configured to receive a discrete signal of complex data symbols (C), calculate frequency responses (A1, . . . AM) corresponding to tones (f(1), . . . f(M)), through an M-point DFT, and output a vector [A1, . . . AM] of length M; a zero insertion hardware module configured to expand the vector to a new vector of length N, and insert zero-value symbols corresponding to tones other than tones allocated to a transmitter; and an inverse discrete Fourier transform (IDFT) hardware module configured to perform an N-point inverse discrete Fourier transform operation on the new vector after zero insertion to obtain the vector of digital signal samples (S), and to generate a low peak-to-average OFDM-based signal using the vector of digital signal samples (S) for transmission. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
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65. An apparatus for generating a vector of digital signal samples (S), the apparatus comprising:
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a discrete Fourier transform (DFT) circuit configured to receive a discrete signal of complex data symbols (C), calculate frequency responses (A1, . . . AM) corresponding to tones (f(1), . . . f(M)), through an M-point DFT, and output a vector [A1, . . . AM] of length M; a zero insertion circuit configured to expand the vector to a new vector of length N, and insert zero-value symbols corresponding to tones other than tones allocated to a transmitter; and an inverse discrete Fourier transform (IDFT) hardware module configured to perform an N-point inverse discrete Fourier transform operation on the new vector after zero insertion to obtain the vector of digital signal samples (S), and to generate a low peak-to-average OFDM-based signal using the vector of digital signal samples (S) for transmission. - View Dependent Claims (66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80)
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81. An apparatus for generating a vector of digital signal samples (S), the apparatus comprising:
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a discrete Fourier transform (DFT) hardware module configured to receive a discrete signal of complex data symbols (C), calculate frequency responses (A1, . . . AM) corresponding to tones (f(1), . . . f(M)), through an M-point DFT, and output a vector [A1, . . . AM] of length M; a zero insertion circuit configured to expand the vector to a new vector of length N, and insert zero-value symbols corresponding to tones other than tones allocated to a transmitter; and an inverse discrete Fourier transform (IDFT) hardware module configured to perform an N-point inverse discrete Fourier transform operation on the new vector after zero insertion to obtain the vector of digital signal samples (S), and to generate a low peak-to-average OFDM-based signal using the vector of digital signal samples (S) for transmission. - View Dependent Claims (82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96)
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97. An apparatus for generating a vector of digital signal samples (S), the apparatus comprising:
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a discrete Fourier transform (DFT) circuit configured to receive a discrete signal of complex data symbols (C), calculate frequency responses (A1, . . . AM) corresponding to tones (f(1), . . . f(M)), through an M-point DFT, and output a vector [A1, . . . AM] of length M; a zero insertion hardware module configured to expand the vector to a new vector of length N, and insert zero-value symbols corresponding to tones other than tones allocated to a transmitter; and an inverse discrete Fourier transform (IDFT) circuit configured to perform an N-point inverse discrete Fourier transform operation on the new vector after zero insertion to obtain the vector of digital signal samples (S), and to generate a low peak-to-average OFDM-based signal using the vector of digital signal samples (S) for transmission. - View Dependent Claims (98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112)
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Specification