WAVEFORM FOR MILLIMETER WAVE NEW RADIO

• US 20190020522A1
• Filed: 06/19/2018
• Published: 01/17/2019
• Est. Priority Date: 07/12/2017
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: SUN, Jing, WANG, Xiao Feng, LUO, Tao, KADOUS, Tamer
• Granted Patent: US 10,700,907 B2
• Time in Patent Office: Days
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04J 2011/0006 with CDM/CDMA
• CPC Class Codes: H04J 2011/0009 with FDM/FDMA
• CPC Class Codes: H04L 27/26134 Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain
• CPC Class Codes: H04L 27/262 Reduction thereof by selection of pilot symbols
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

Certain aspects of the present disclosure relate to communication systems, and more particularly, to single-carrier waveform generation for transmission. An exemplary method generally includes concatenating a first sequence of data samples with samples of a known sequence to generate a first series of samples, performing a discrete Fourier transform (DFT) on the first series of samples to generate a first series of frequency-domain samples, mapping the first series of frequency-domain samples and first zero values to first tones of a system bandwidth, performing an inverse discrete Fourier transform (IDFT) on the mapped first series of frequency-domain samples and the mapped first zero values to generate first time-domain samples of a first orthogonal frequency domain multiplexing (OFDM) symbol, and transmitting the first OFDM symbol as a single-carrier waveform in a first period.

Claims

1. A method for wireless communications, comprising:

concatenating a first sequence of data samples with samples of a known sequence to generate a first series of samples;

performing a discrete Fourier transform (DFT) on the first series of samples to generate a first series of frequency-domain samples;

mapping the first series of frequency-domain samples and first zero values to tones of a system bandwidth;

performing an inverse discrete Fourier transform (IDFT) on the mapped first series of frequency-domain samples and the mapped first zero values to generate first time domain samples of a first OFDM symbol; and

transmitting the first OFDM symbol as a single-carrier waveform in a first period.

2. The method of claim 1, wherein the DFT has a size equal to a number of samples in the first series of samples.

3. The method of claim 1, wherein mapping the first series of frequency-domain samples and the first zero values to the tones of the system bandwidth comprises mapping the first series of frequency-domain samples to consecutive tones of the system bandwidth.

4. The method of claim 1, further comprising:

concatenating a second sequence of data samples with samples of the known sequence to generate a second series of samples;

performing a discrete Fourier transform (DFT) on the second series of samples to generate a second series of frequency-domain samples;

mapping the second series of frequency-domain samples and second zero values to the tones of the system bandwidth;

performing an inverse discrete Fourier transform (IDFT) on the mapped second series of frequency-domain samples and the mapped second zero values to generate second time domain samples of a second OFDM symbol; and

transmitting the second OFDM symbol as another single-carrier waveform in a second period, wherein the first period and the second period are consecutive periods.

5. A method for wireless communications, comprising:

receiving a first OFDM symbol as a single-carrier waveform in a first period in a system bandwidth;

performing a discrete Fourier transform (DFT) on first time domain samples of the first OFDM symbol to generate first frequency-domain samples;

performing an inverse discrete Fourier transform (IDFT) on the first frequency-domain samples to generate a first series of data samples and first samples of a known sequence; and

processing the first series of data samples to determine data.

6. The method of claim 5, wherein the IDFT has a size equal to a number of non-zero samples in the first frequency-domain samples.

7. The method of claim 5, wherein the first frequency-domain samples are mapped to consecutive tones of the system bandwidth.

8. The method of claim 5, further comprising:

receiving a second OFDM symbol as another single-carrier waveform in a second period, wherein the first period and the second period are consecutive periods;

performing a discrete Fourier transform (DFT) on second time-domain samples of the second OFDM symbol to generate second frequency-domain samples;

performing an inverse discrete Fourier transform (IDFT) on the second frequency-domain samples to generate a second series of data samples and second samples of the known sequence; and

comparing the first samples of the known sequence with the second samples of the known sequence to track phase of a transmitter transmitting the first OFDM symbol and the second OFDM symbol.

9. An apparatus for wireless communications, comprising:

a processor configured to;

concatenate a first sequence of data samples with samples of a known sequence to generate a first series of samples;

perform a discrete Fourier transform (DFT) on the first series of samples to generate a first series of frequency-domain samples;

map the first series of frequency-domain samples and first zero values to tones of a system bandwidth;

perform an inverse discrete Fourier transform (IDFT) on the mapped first series of frequency-domain samples and the mapped first zero values to generate first time domain samples of a first OFDM symbol; and

transmit the first OFDM symbol as a single-carrier waveform in a first period; and

a memory coupled with the processor.

10. The apparatus of claim 9, wherein the processor is configured to perform the DFT that has a size equal to a number of samples in the first series of samples.

11. The apparatus of claim 9, wherein the processor is configured to map the first series of frequency-domain samples and the first zero values to the tones of the system bandwidth by mapping the first series of frequency-domain samples to consecutive tones of the system bandwidth.

12. The apparatus of claim 9, wherein the processor is further configured to:

concatenate a second sequence of data samples with samples of the known sequence to generate a second series of samples;

perform a discrete Fourier transform (DFT) on the second series of samples to generate a second series of frequency-domain samples;

map the second series of frequency-domain samples and second zero values to the tones of the system bandwidth;

perform an inverse discrete Fourier transform (IDFT) on the mapped second series of frequency-domain samples and the mapped second zero values to generate second time domain samples of a second OFDM symbol; and

transmit the second OFDM symbol as another single-carrier waveform in a second period, wherein the first period and the second period are consecutive periods.

13. An apparatus for wireless communications, comprising:

a processor configured to;

receive a first OFDM symbol as a single-carrier waveform in a first period in a system bandwidth;

perform a discrete Fourier transform (DFT) on first time domain samples of the first OFDM symbol to generate first frequency-domain samples;

perform an inverse discrete Fourier transform (IDFT) on the first frequency-domain samples to generate a first series of data samples and first samples of a known sequence; and

process the first series of data samples to determine data; and

a memory coupled with the processor.

14. The apparatus of claim 13, wherein the processor is configured to perform the IDFT that has a size equal to a number of non-zero samples in the first frequency-domain samples.

15. The apparatus of claim 13, wherein the processor is configured to perform the IDFT on the first frequency-domain samples that are mapped to consecutive tones of the system bandwidth.

16. The apparatus of claim 13, wherein the processor is further configured to:

receive a second OFDM symbol as another single-carrier waveform in a second period, wherein the first period and the second period are consecutive periods;

perform a discrete Fourier transform (DFT) on second time-domain samples of the second OFDM symbol to generate second frequency-domain samples;

perform an inverse discrete Fourier transform (IDFT) on the second frequency-domain samples to generate a second series of data samples and second samples of the known sequence; and

compare the first samples of the known sequence with the second samples of the known sequence to track phase of a transmitter transmitting the first OFDM symbol and the second OFDM symbol.