Blind identification of transmission structure in a wireless communications system

Patent metadata

Field	Value
Publication number	US-10177942-B2
Application number	US-201715849551-A
Country	US
Kind code	B2
Filing date	Dec 20, 2017
Priority date	Dec 21, 2016
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A wireless data reception method for receiving orthogonal frequency division multiplexing (OFDM) signal includes determining that an interfering signal is present, along with a serving cell signal, in the OFDM signal on the shared downlink channel, determining an estimate of a transmission structure of the received interfering signal, wherein the transmission structure is defined by a plurality of transmission parameters, classifying the estimate of the transmission structure as belonging to a subgroup from a plurality of possible subgroups in a dynamic order, estimating, in a priority order, at least some of the plurality of transmission parameters of the estimate of the transmission structure, and performing further receiver-side processing of the serving cell signal by subtracting contribution of the interfering signal from the OFDM signal based on the estimate of the transmission structure and a result of the estimating step.

First claim

What is claimed is:

1. A method of wireless signal processing performed at a receiver in a wireless network, comprising:
receiving, by a wireless receiver, an orthogonal frequency division multiplexing (OFDM) signal on a shared downlink channel from the wireless network;
determining that an interfering signal is present, along with a serving cell signal, in the OFDM signal on the shared downlink channel;
determining an estimate of a transmission structure of the received interfering signal, wherein the transmission structure is defined by a plurality of transmission parameters;
classifying the estimate of the transmission structure as belonging to a subgroup from a plurality of possible subgroups in a dynamic order;
estimating, in a priority order, at least some of the plurality of transmission parameters of the estimate of the transmission structure; and
performing further receiver-side processing of the serving cell signal by subtracting contribution of the interfering signal from the OFDM signal based on the estimate of the transmission structure and a result of the estimating step.

2. The method of claim 1 , wherein the dynamic order for classifying the estimated transmission structure is determined at run-time depending on a transmission structure estimation outcome of signals received in a previous transmission time interval.

3. The method of claim 1 , wherein the priority order for the estimating step is responsive to a sensitivity of results of the estimating step with respect to the plurality of transmission parameters.

4. The method of claim 1 , wherein the classifying step comprises:
comparing similarity between signal power received on antennas of the wireless receiver with entries from a look-up table, wherein the entries from the look-up table include simulated cross-correlations between combination of pre-coding vectors used for signal transmission in the wireless network.

5. The method of claim 1 , wherein the performing the further receiver-side processing includes:
performing a symbol-level interference cancellation (SLIC) algorithm.

6. The method of claim 1 , wherein the plurality of transmission parameters includes:
any one or more of a parameter that is configured by a higher layer message, a parameter that is dynamically signaled during a data transmission session and a parameter that is related to a network operator's deployment.

7. The method of claim 1 , wherein the estimating of at least some of the plurality of transmission parameters includes:
estimating a modulation scheme of the received interfering signal by performing blind estimation to estimate constellation points of received data symbols.

8. The method of claim 1 , wherein the serving cell signal comprises:
a reference signal known a priori to the wireless receiver.

9. The method of claim 1 , wherein the determining the estimate of the transmission structure includes:
using a difference between an average power of symbols received at different antenna ports of the wireless receiver.

10. A non-transitory computer-readable program medium storing computer-executable instructions, which when executed by a processor, causing the processor to implement a method of wireless signal processing performed at a receiver in a wireless network, comprising:
receiving, by a wireless receiver, an orthogonal frequency division multiplexing (OFDM) signal on a shared downlink channel from the wireless network;
determining that an interfering signal is present, along with a serving cell signal, in the OFDM signal on the shared downlink channel;
determining an estimate of a transmission structure of the received interfering signal, wherein the transmission structure is defined by a plurality of transmission parameters;
classifying the estimate of the transmission structure as belonging to a subgroup from a plurality of possible subgroups in a dynamic order;
estimating, in a priority order, at least some of the plurality of transmission parameters of the estimate of the transmission structure; and
performing further receiver-side processing of the serving cell signal by subtracting contribution of the interfering signal from the OFDM signal based on the estimate of the transmission structure and a result of the estimating step.

11. The non-transitory computer-readable program of claim 10 , wherein the dynamic order for classifying the estimated transmission structure is determined at run-time depending on a transmission structure estimation outcome of signals received in a previous transmission time interval.

12. The non-transitory computer-readable program of claim 10 , wherein the priority order for the estimating step is responsive to a sensitivity of results of the estimating step with respect to the plurality of transmission parameters.

13. The non-transitory computer-readable program of claim 10 , wherein the classifying step comprises:
comparing similarity between signal power received on antennas of the wireless receiver with entries from a look-up table, wherein the entries from the look-up table include simulated cross-correlations between combination of pre-coding vectors used for signal transmission in the wireless network.

14. The non-transitory computer-readable program of claim 10 , wherein the performing the further receiver-side processing includes:
performing a symbol-level interference cancellation (SLIC) algorithm.

15. The non-transitory computer-readable program of claim 10 , wherein the plurality of transmission parameters includes:
any one or more of a parameter that is configured by a higher layer message, a parameter that is dynamically signaled during a data transmission session and a parameter that is related to a network operator's deployment.

16. The non-transitory computer-readable program of claim 10 , wherein the estimating of at least some of the plurality of transmission parameters includes:
estimating a modulation scheme of the received interfering signal by performing blind estimation to estimate constellation points of received data symbols.

17. The non-transitory computer-readable program of claim 10 , wherein the serving cell signal comprises:
a reference signal known a priori to the wireless receiver.

18. The non-transitory computer-readable program of claim 10 , wherein the determining the estimate of the transmission structure includes:
using a difference between an average power of symbols received at different antenna ports of the wireless receiver.

19. A wireless communication receiver, comprising:
a memory, a processor, and one or more antenna ports, wherein the one or more antenna ports receive an orthogonal frequency division multiplexing (OFDM) signal, and wherein the processor reads instructions from the memory and causes the wireless communication receiver to:
receive the orthogonal frequency division multiplexing (OFDM) signal on a shared downlink channel from the wireless network;
determine that an interfering signal is present, along with a serving cell signal, in the OFDM signal on the shared downlink channel;
determine an estimate of a transmission structure of the received interfering signal, wherein the transmission structure is defined by a plurality of transmission parameters;
classify the estimate of the transmission structure as belonging to a subgroup from a plurality of possible subgroups in a dynamic order;
estimate, in a priority order, at least some of the plurality of transmission parameters of the estimate of the transmission structure; and
perform further receiv

Assignees

• Zte Corp
• Zte Canada Inc

Inventors

• Qian Xing
• Zhao Lijuan
• Zhang Junling

Classifications

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L25/03019 Primary

  adaptive, i.e. capable of adjustment during data reception · CPC title

• H04J11/0023

  Interference mitigation or co-ordination (direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541) · CPC title

• H04J11/005

  of intercell interference · CPC title

• H04L5/0073

  Allocation arrangements that take into account other cell interferences · CPC title