Data detection in MIMO systems with demodulation and tracking reference signals

Patent metadata

Field	Value
Publication number	US-11323162-B2
Application number	US-201916525618-A
Country	US
Kind code	B2
Filing date	Jul 30, 2019
Priority date	Dec 14, 2016
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

What is disclosed is a method for wireless communication comprising receiving a wireless communication via a receiver of the mobile communication device, deriving a demodulation reference signal from a first plurality of symbols of the wireless communication; creating a channel estimation matrix using the demodulation reference signal; inverting the channel estimation matrix to obtain a channel pseudo-inverse matrix; deriving a tracking reference signal from a second plurality of symbols of the wireless communication; calculating a phase shift for one or more additional symbols based on the tracking reference signal; determining a corrected channel pseudo-inverse matrix for the one or more additional symbols by adjusting the channel pseudo-inverse matrix according to the calculated phase shift; and controlling the receiver to accomplish data detection using the corrected channel pseudo-inverse matrix on one or more orthogonal frequency division multiplexing subcarriers.

First claim

What is claimed is:

1. A wireless signal detection device, comprising one or more processors, configured to:
generate, from signal data comprising a first reference signal and a second reference signal from a plurality of receive antennas, a channel estimation for a subframe of a plurality of subframes based on the first reference signal, wherein the channel estimation is generated once for the subframe, the plurality of subframes form a frame, the subframe comprises a plurality of symbols and a plurality of subcarriers, and the signal data comprises the first reference signal at a rate of once per frame;
generate a detection matrix for the subframe using the channel estimation, wherein the detection matrix is generated once for the subframe;
determine a first phase shift from a first symbol of the second reference signal, wherein the second reference signal is on a single subcarrier of the plurality of subcarriers and fewer than each symbol of the plurality of symbols within the single subcarrier;
generate a first phase-corrected detection matrix by modifying the detection matrix by the first phase shift;
detect a second symbol using the first phase-corrected detection matrix;
determine a second phase shift from a third symbol of the second reference signal;
generate a second phase-corrected detection matrix by modifying the detection matrix by the second phase shift; and
detect a fourth symbol using the second phase-corrected detection matrix.

2. The wireless signal detection device of claim 1 , wherein the one or more processors are further configured to identify the second reference signal in the signal data as a tracking reference transmission, and wherein the one or more processors determine the first phase shift using the first symbol of the tracking reference transmission.

3. The wireless signal detection device of claim 1 , wherein the plurality of receive antennas are asynchronous receive antennas and wherein the asynchronous receive antennas are configured to receive the wireless signal from a plurality of asynchronous transmit antennas.

4. The wireless signal detection device of claim 1 , wherein the one or more processors are further configured to estimate one or more symbols in the signal data using a multiple-input multiple-output detection.

5. The wireless signal detection device of claim 1 , wherein the detection matrix is a pseudo-inverse matrix.

6. The wireless signal detection device of claim 2 , wherein the tracking reference transmission is a Phase Noise Compensation Reference Signal.

7. The wireless signal detection device of claim 2 , wherein the one or more processors determine the second phase shift using the second symbol of the tracking reference transmission.

8. The wireless signal detection device of claim 5 , wherein the one or more processors are configured to generate the first phase-corrected detection matrix by calculating a Hadamard product of the detection matrix and the first phase shift.

9. A method of wireless signal detection, comprising
receiving on a plurality of receive antennas a wireless signal representing signal data;
generating, from the signal data comprising a first reference signal and a second reference signal, a channel estimation for a subframe of a plurality of subframes based on the first reference signal, wherein the channel estimation is generated once for the subframe, the plurality of subframes form a frame, the subframe comprises a plurality of symbols, the signal data comprises the first reference signal at a rate equal to or greater than once per frame and less than once per subframe of the plurality of subframes, and the first reference signal is on fewer than each sub-carrier of a single symbol within a time domain;
isolating each symbol of the plurality of symbols based on the channel estimation;
generating a detection matrix for the subframe from the channel estimation, wherein the detection matrix is generated once for the subframe;
determining a first phase shift from a first isolated symbol of the plurality of isolated symbols of the second reference signal;
generating a first phase-corrected detection matrix by calculating a Hadamard product of the detection matrix and the first phase shift;
detecting a second isolated symbol of the plurality of isolated symbols using the first phase-corrected detection matrix;
determining a second phase shift from a third isolated symbol of the plurality of isolated symbols of the second reference signal,
generating a second phase-corrected detection matrix by modifying the detection matrix by the second phase shift; and
detecting a fourth isolated symbol of the plurality of isolated symbols using the second phase-corrected detection matrix.

10. The method of wireless signal detection of claim 9 , further comprising identifying in the wireless signal the second reference signal.

11. The method of wireless signal detection of claim 9 , wherein the first isolated symbol is adjacent to the third isolated symbol.

12. The method of wireless signal detection of claim 9 , wherein the wireless signal is received from a plurality of asynchronous transmit antennas.

13. The method of wireless signal detection of claim 9 , further comprising estimating one or more symbols in the signal data using a multiple-input multiple-output detection.

14. The method of wireless signal detection of claim 9 , wherein the detection matrix is a pseudo-inverse matrix.

15. The method of wireless signal detection of claim 10 , wherein the second reference signal is a Phase Noise Compensation Reference Signal.

16. A wireless signal detection device, comprising one or more processors, configured to:
generate, from signal data comprising a first reference signal and a second reference signal from a plurality of receive antennas, a channel estimation for a subframe of a plurality of subframes based on the first reference signal, wherein:
the channel estimation is generated once for the subframe;
the subframe comprises a plurality of symbols;
the plurality of receive antennas are asynchronous receive antennas configured to receive the wireless signal from a plurality of asynchronous transmit antennas;
the plurality of subframes form a frame;
the signal data comprises the first reference signal at a rate equal to or greater than once per frame and less than once per subframe of the plurality of subframes; and
the first reference signal is on fewer than each sub-carrier of a single symbol within a time domain;

isolate each symbol of the plurality of symbols based on the channel estimation;
generate a detection matrix for the subframe using the channel estimation, wherein the detection matrix is generated once for the subframe;
determine a first phase shift from a first isolated symbol of the plurality of symbols of the second reference signal;
generate a first phase-corrected detection matrix by modifying the detection matrix by the first phase shift;
detect a second isolated symbol of the plurality of symbols using the first phase-corrected detection matrix;
determine a second phase shift from a third isolated symbol of the plurality of symbols of the second reference signal;
generate a second phase-corrected detection matrix by modifying the detection matrix by the second phase shift; and
detect a fourth isolated symbol of the plurality of symbols using the second phase-corrected detection matrix.

Assignees

• Intel Ip Corp
• Intel Corp

Inventors

• Gudovskiy Denis
• Rajagopalan Karthik
• Ghaffar Rizwan
• Li Chuxiang

Classifications

• H04L25/0256

  Channel estimation using minimum mean square error criteria · CPC title

• H04L25/0236

  using estimation of the other symbols · CPC title

• H04W24/02

  Arrangements for optimising operational condition · CPC title

• H04L25/03993

  Noise whitening · CPC title

• H04B7/0456 Primary

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title