SINGLE CARRIER WAVEFORM DATA TRANSMISSION AND RECEPTION BASED ON CONFIGURABLE DFT WINDOW

• US 20180367362A1
• Filed: 06/08/2018
• Published: 12/20/2018
• Est. Priority Date: 06/16/2017
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: SUN, Jing, KADOUS, Tamer, LUO, Tao, WANG, Xiao Feng, LEI, Jing
• Granted Patent: US 10,700,910 B2
• Time in Patent Office: Days
• CPC Class Codes: H04J 1/00 Frequency-division multiplex systems H04J14/00 takes precedence
• CPC Class Codes: H04L 27/2605 Symbol extensions, e.g. Zero Tail, Unique Word [UW]
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2627 Modulators
• 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 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal

Abstract

In order to maintain flexible system bandwidth and a flexible center frequency, without requiring a cyclic prefix or guard interval, a transmitter apparatus transmits a reference signal based on a single carrier waveform having a mixed symbol structure, in reference signal symbols using at least one of a cyclic prefix and a guard interval and transmits data based on the single carrier waveform without the cyclic prefix or the guard interval. The data may be based on input data processed using overlapping FFT windows, and an amount of overlap between the FFT windows may be configurable by the transmitter or the receiver. An apparatus receiving the downlink transmission comprising data based on a single carrier waveform may process the data based on overlapping FFT windows.

Claims

1. A method of wireless communication at a transmitter based on a mixed symbol structure, comprising:

transmitting a reference signal to a receiver based on a single carrier waveform in reference signal symbols using at least one of a cyclic prefix and a guard interval; and

transmitting data to the receiver based on the single carrier waveform without the cyclic prefix or the guard interval.

2. The method of claim 1, wherein the data is transmitted in data symbols without the cyclic prefix or the guard interval.

3. The method of claim 1, wherein the reference signal comprises a Demodulation Reference Signal (DMRS).

4. The method of claim 1, wherein the single carrier waveform comprises DFT-Spread-Frequency-Division-Multiplexing (DFT-s-FDM).

5. The method of claim 1, wherein the single carrier waveform comprises Single Carrier-Quadrature Amplitude Modulation (SC-QAM).

6. The method of claim 1, wherein the data is based on input data processed using overlapping Fast Fourier Transform (FFT) windows.

7. The method of claim 6, wherein a first FFT window comprises the input data comprised in a second, adjacent FFT window.

8. The method of claim 6, wherein an amount of overlap between the FFT windows is configurable by the transmitter or the receiver.

11. The method of claim 1, wherein the single carrier waveform comprises DFT-Spread-Frequency-Division-Multiplexing (DFT-s-FDM).

12. The method of claim 1, wherein the single carrier waveform comprises Single Carrier-Quadrature Amplitude Modulation (SC-QAM).

9. An apparatus for wireless communication at a transmitter based on a mixed symbol structure, comprising:

a memory; and

at least one processor coupled to the memory and configured to;

transmit a reference signal to a receiver based on a single carrier waveform in reference signal symbols using at least one of a cyclic prefix and a guard interval; and

transmit data to the receiver based on the single carrier waveform without the cyclic prefix or the guard interval.

10. The apparatus of claim 9, wherein the data is transmitted in data symbols without the cyclic prefix or the guard interval.

13. The apparatus of claim 9, wherein the reference signal comprises a Demodulation Reference Signal (DMRS).

14. The apparatus of claim 9, wherein the data is based on input data processed using overlapping Fast Fourier Transform (FFT) windows, wherein a first FFT window comprises the input data comprised in a second, adjacent FFT window, and wherein an amount of overlap between the FFT windows is configurable by the transmitter or the receiver.

15. A method of wireless communication at a receiver based on a mixed symbol structure, comprising:

receiving a reference signal based on a single carrier waveform in reference signal symbols having at least one of a cyclic prefix and a guard interval;

receiving a transmission in data symbols comprising data based on the single carrier waveform without the cyclic prefix or the guard interval; and

processing the reference signal and the data.

16. The method of claim 15, wherein the reference signal comprises a Demodulation Reference Signal (DMRS).

17. The method of claim 15, wherein the reference signal is received based on a fixed Fast Fourier Transform (FFT) window and the data is received based on a configurable FFT window.

18. The method of claim 17, wherein the data is processed based on overlapping Fast Fourier Transform (FFT) windows.

19. The method of claim 18, wherein a first FFT window comprises the data comprised in a second, adjacent FFT window.

20. The method of claim 18, wherein an amount of overlap between the FFT windows is configurable by the receiver or a transmitter.

21. The method of claim 20, wherein the amount of overlap is based on a level of inter-symbol interference for the transmission.

22. The method of claim 20, wherein the amount of overlap between the FFT windows configured by the receiver to process the received data is configured independently from a second amount of overlap configured by the transmitter.

23. The method of claim 15, wherein the single carrier waveform comprises Discrete Fourier Transform-Spread-Frequency-Division-Multiplexing (DFT-s-FDM).

24. The method of claim 15, wherein the single carrier waveform comprises Single Carrier-Quadrature Amplitude Modulation (SC-QAM).

25. An apparatus for wireless communication at a receiver based on a mixed symbol structure, comprising:

a memory; and

at least one processor coupled to the memory and configured to;

receive a reference signal based on a single carrier waveform in reference signal symbols having at least one of a cyclic prefix and a guard interval;

receive a transmission in data symbols comprising data based on the single carrier waveform without the cyclic prefix or the guard interval; and

process the reference signal and the data.

26. The apparatus of claim 25, wherein the reference signal is received based on a fixed Fast Fourier Transform (FFT) window and the data is received based on a configurable FFT window.

27. The apparatus of claim 26, wherein the data is processed based on overlapping Fast Fourier Transform (FFT) windows.

28. The apparatus of claim 27, wherein a first FFT window comprises the data comprised in a second, adjacent FFT window.

29. The apparatus of claim 27, wherein an amount of overlap between the FFT windows is configurable by the receiver or a transmitter.

30. The apparatus of claim 29, wherein the amount of overlap is based on a level of inter-symbol interference for the transmission.

31. The apparatus of claim 29, wherein the amount of overlap between the FFT windows configured by the receiver to process the received data is configured independently from a second amount of overlap configured by the transmitter.