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US 10,764,102 B2Granted
Apparatus and methods for non-systematic complex coded discrete fourier transform spread orthogonal frequency division multiplexing
AssigneeIDAC Holdings, Inc.
InventorsAlphan Sahin, Mihaela C Beluri, Rui Yang, Erdem Bala, Afshin Haghighat
Life of this patent
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Abstract
The invention pertains to methods and apparatus for non-systematic complex coded unique word DFT spread orthogonal frequency division multiplexing.
Claims20
A method implemented in a wireless transmit/receive unit for transmitting symbols using discrete Fourier transformation (DFT) spread orthogonal frequency division multiplexing (DFT-S-OFDM), the method comprising:
- mapping a first symbol vector to inputs of a DFT spread block using a permutation matrix that inserts zeroes into the first symbol vector corresponding to inputs of the DFT spread block to which symbols of the first symbol vector are not mapped to produce a second vector;
- inserting a perturbation into the second vector to produce a third vector;
- performing a DFT on the third vector to produce a fourth vector, wherein the perturbation is configured to generate zeros on predetermined elements of the fourth vector;
- performing an inverse DFT (IDFT) operation on the fourth vector to produce an IDFT output signal;
- cancelling a tail of the IDFT output signal to produce a modified IDFT output signal;
- and
- transmitting the modified IDFT output signal.
4 more elements
A wireless transmit/receive unit comprising circuitry, including a transmitter and processor, configured to:
- map a first symbol vector to inputs of a discrete Fourier transformation (DFT) spread block using a permutation matrix that inserts zeroes into the first symbol vector corresponding to inputs of the DFT spread block to which symbols of the first symbol vector are not mapped to produce a second vector;
- insert a perturbation into the second vector to produce a third vector;
- perform a DFT on the third vector to produce a fourth vector, wherein the perturbation is configured to generate zeros on predetermined elements of the fourth vector;
- perform an inverse DFT (IDFT) operation on the fourth vector to produce an IDFT output signal;
- cancel a tail of the IDFT output signal to produce a modified IDFT output signal;
- and
- transmit the modified IDFT output signal using DFT spread orthogonal frequency division multiplexing (DFT-S-OFDM).
4 more elements
Dependencies are inferred from the claim text.