Common broadcast channel low PAPR signaling in massive MIMO systems

Patent metadata

Field	Value
Publication number	US-9973362-B2
Application number	US-201414490483-A
Country	US
Kind code	B2
Filing date	Sep 18, 2014
Priority date	Mar 7, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

Methods and devices for common channel low PAPR signaling are disclosed having a power amplifier set configured to transmit broad-beam signals over a frequency band narrower than the available bandwidth and modulated with a low PAPR sequence. A second power amplifier set may be configured to transmit narrow-beam unicast signals.

First claim

What is claimed is:

1. A method of transmitting with a Multiple-Input Multiple-Output (MIMO) transmitter to User Equipment (UE) comprising:
obtaining a low Peak-to-Average-Power-Ratio (PAPR) broadcast signal and a unicast signal;
amplifying the low PAPR broadcast signal at a first power amplifier of the MIMO transmitter;
amplifying the unicast signal at a second power amplifier of the MIMO transmitter;
transmitting the amplified unicast signal;
transmitting the amplified low PAPR broadcast signal in less than all time intervals in which the transmitter transmits; and
powering down the first power amplifier during time intervals in which the amplified low PAPR broadcast signal is not transmitted.

2. The method of claim 1 wherein the low PAPR broadcast signal is obtained by applying a Zadoff-Chu sequence to a signal to be communicated wirelessly.

3. The method of claim 1 wherein the low PAPR broadcast signal is obtained by applying a Golay complementary sequence to a signal to be communicated wirelessly.

4. The method of claim 1 wherein the low PAPR broadcast signal comprises a Primary Synchronization Signal.

5. The method of claim 4 wherein the Primary Synchronization Signal is transmitted over a central 62 subcarriers of an available bandwidth.

6. The method of claim 1 wherein the low PAPR broadcast signal comprises a Secondary Synchronization Signal.

7. The method of claim 6 wherein the Secondary Synchronization Signal is transmitted over a central 62 subcarriers of an available bandwidth.

8. The method of claim 1 wherein the low PAPR broadcast signal comprises a Physical Broadcast Control Channel signal.

9. The method of claim 8 wherein the Physical Broadcast Control Channel signal is transmitted over a central 72 subcarriers of an available bandwidth.

10. The method of claim 8 wherein Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) is used to achieve a low PAPR in the low PAPR broadcast signal.

11. The method of claim 10 further comprising using the DFT-S-OFDM with Space-Time block coding based Transmit Diversity (STTD).

12. The method of claim 1 wherein the low PAPR broadcast signal comprises a Physical Downlink Control Channel signal.

13. The method of claim 12 further comprising applying Orthogonal Frequency Division Multiplexing (OFDM) and Space-Frequency Transmit Diversity (SFTD) to the Physical Downlink Control Channel signal.

14. The method of claim 13 further comprising applying QPSK with iterative clipping to the low PAPR broadcast signal to further reduce the PAPR of the low PAPR broadcast signal.

15. The method of claim 1 wherein the low PAPR broadcast signal comprises a Physical Downlink Shared Channel signal.

16. The method of claim 15 further comprising applying Orthogonal Frequency Division Multiplexing (OFDM) and Space-Frequency Transmit Diversity (SFTD) to the Physical Downlink Shared Channel signal.

17. The method of claim 16 further comprising applying QPSK with iterative clipping to the low PAPR broadcast signal to further reduce the PAPR of the low PAPR broadcast signal.

18. The method of claim 1 wherein the MIMO transmitter has a number of antennas greater than a number of the UE serviced by the transmitter.

19. The method of claim 1 further comprising, during time intervals in which the amplified low PAPR broadcast signal is not transmitted, transmitting the unicast signal over a portion of a frequency spectrum in which the amplified low PAPR broadcast signal is transmitted when the amplified low PAPR broadcast signal is transmitted.

20. A Multiple-Input Multiple-Output (MIMO) transmitter for transmitting to User Equipment (UE), comprising:
a first power amplifier configured to amplify a low Peak-to-Average-Power-Ratio (PAPR) broadcast signal to generate an amplified low PAPR broadcast signal;
a second power amplifier configured to amplify a unicast signal to generate an amplified unicast signal;
at least one antenna in communication with the first power amplifier and the second power amplifier, the at least one antenna configured to transmit the amplified low PAPR broadcast signal and transmit the amplified unicast signal;
a non-transitory memory storage comprising instructions; and
one or more processors in communication with the non-transitory memory storage, wherein the one or more processors execute the instructions to:
cause the at least one antenna to transmit the amplified low PAPR broadcast signal in less than all time intervals in which the transmitter transmits; and
power down the first power amplifier during time intervals in which the amplified low PAPR broadcast signal is not transmitted.

21. The transmitter of claim 20 wherein the low PAPR broadcast signal is obtained by applying a Zadoff-Chu sequence to a signal to be communicated wirelessly.

22. The transmitter of claim 20 wherein the low PAPR broadcast signal is obtained by applying a Golay complementary sequence to a signal to be communicated wirelessly.

23. The transmitter of claim 20 wherein the low PAPR broadcast signal comprises a Primary Synchronization Signal.

24. The transmitter of claim 23 wherein the Primary Synchronization Signal is transmitted over a central 62 subcarriers of an available bandwidth.

25. The transmitter of claim 20 wherein the low PAPR broadcast signal comprises a Secondary Synchronization Signal.

26. The transmitter of claim 25 wherein the Secondary Synchronization Signal is transmitted over a central 62 subcarriers of an available bandwidth.

27. The transmitter of claim 20 wherein the low PAPR broadcast signal comprises one of a Physical Broadcast Control Channel signal, Physical Downlink Control Channel signal, or Physical Downlink Shared Channel signal.

28. The transmitter of claim 20 wherein the one or more processors further execute the instructions to apply Orthogonal Frequency Division Multiplexing (OFDM) and Space-Frequency Transmit Diversity (SFTD) to achieve a low PAPR in the low PAPR broadcast signal.

29. The transmitter of claim 20 wherein the one or more processors further execute the instructions to apply QPSK with iterative clipping to achieve a low PAPR in the low PAPR broadcast signal.

30. The transmitter of claim 20 wherein the transmitter has a number of antennas greater than a number of the UE serviced by the transmitter.

31. The transmitter of claim 20 wherein the one or more processors further execute the instructions to, during time intervals in which the amplified low PAPR broadcast signal is not transmitted, transmit the unicast signal over a portion of a frequency spectrum in which the amplified low PAPR broadcast signal is transmitted when the amplified low PAPR broadcast signal is transmitted.

Assignees

• Huawei Tech Co Ltd

Inventors

• Jia Ming
• Ma Jianglei

Classifications

• H04B1/0483

  Transmitters with multiple parallel paths · CPC title

• H04W52/028

  switching on or off only a part of the equipment circuit blocks · CPC title

• H04B2001/0408

  with power amplifiers · CPC title

• H04B7/0452

  Multi-user MIMO systems · CPC title

• Y02B70/30

  Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level · CPC title