SIGNALING METHOD IN AN OFDM MULTIPLE ACCESS SYSTEM
First Claim
1. A processor-based apparatus for generating wireless communications, the processor-based apparatus comprising:
- a first circuit configured to perform a Discrete Fourier Transform (DFT) on a discrete signal of complex data symbols to obtain a first frequency response vector of length M;
a second circuit configured to map values of the first frequency response vector to values of a second frequency response vector of length N, the second frequency response vector having zero value symbols corresponding to tones other than tones allocated to the processor-based apparatus;
a third circuit configured to perform an N-point Inverse DFT (IDFT) on a second frequency response vector to obtain a vector of digital signal samples;
a fourth circuit configured to pre-pend a cyclic prefix to the vector of digital signal samples; and
a fifth circuit configured to generate a signal representing the vector of digital signal samples with pre-pended cyclic prefix 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
48 Claims
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1. A processor-based apparatus for generating wireless communications, the processor-based apparatus comprising:
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a first circuit configured to perform a Discrete Fourier Transform (DFT) on a discrete signal of complex data symbols to obtain a first frequency response vector of length M; a second circuit configured to map values of the first frequency response vector to values of a second frequency response vector of length N, the second frequency response vector having zero value symbols corresponding to tones other than tones allocated to the processor-based apparatus; a third circuit configured to perform an N-point Inverse DFT (IDFT) on a second frequency response vector to obtain a vector of digital signal samples; a fourth circuit configured to pre-pend a cyclic prefix to the vector of digital signal samples; and a fifth circuit configured to generate a signal representing the vector of digital signal samples with pre-pended cyclic prefix 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. A method for wireless communications utilizing at least one processor, comprising:
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performing a Discrete Fourier Transform (DFT) on a discrete signal of complex data symbols to obtain a first frequency response vector of length M; mapping values of the first frequency response vector to values of a second frequency response vector of length N, the second frequency response vector having zero value symbols corresponding to tones other than tones allocated to an apparatus;
performing an N-point Inverse DFT (IDFT) on a second frequency response vector to obtain a vector of digital signal samples;pre-pending a cyclic prefix to the vector of digital signal samples; and generating a signal representing the vector of digital signal samples with pre-pended cyclic prefix 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. A processor-based apparatus for wireless communications, the processor-based apparatus comprising:
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means for performing a Discrete Fourier Transform (DFT) on a discrete signal of complex data symbols to obtain a first frequency response vector of length M; means for mapping values of the first frequency response vector to values of a second frequency response vector of length N, the second frequency response vector having zero value symbols corresponding to tones other than tones allocated to the processor-based apparatus; means for performing an N-point Inverse DFT (IDFT) on a second frequency response vector to obtain a vector of digital signal samples; means for pre-pending a cyclic prefix to the vector of digital signal samples; and means for generating a signal representing the vector of digital signal samples with pre-pended cyclic prefix for transmission. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification