Method and apparatus for blind detecting a transmission mode for interference cancellation

Patent metadata

Field	Value
Publication number	US-10027392-B2
Application number	US-201615005657-A
Country	US
Kind code	B2
Filing date	Jan 25, 2016
Priority date	Jan 23, 2015
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

Methods and apparatuses are provided for determining an interference transmission mode (TM) at a communication device in a cellular communication system using a resource element (RE) defined by frequency and time. A first signal is received in one RE. The first signal comprises a serving signal and an interference signal. A first vector of the received first signal is projected onto each of N projection vectors. A traffic-to-pilot ratio (TPR) decision metric of the interference signal is determined by using N pairs of an actual squared value and an expected squared value which are corresponding to the projected first vector. A TM of the interference signal is detected by determining a TF of the interference signal which minimizes the TPR decision metric from among predetermined transmit format (TF) candidates.

First claim

What is claimed is:

1. A method for determining an interference transmission mode (TM) at a communication device in a cellular communication system using a resource element (RE) defined by frequency and time, the method comprising:
receiving a first signal in one RE, the first signal comprising a serving signal and an interference signal;
projecting a first vector of the received first signal onto each of N projection vectors;
determining a traffic-to-pilot ratio (TPR) decision metric of the interference signal using N pairs of an actual squared value and an expected squared value which are corresponding to the projected first vector; and
determining, from among predetermined transmit format (TF) candidates, a TF of the interference signal which minimizes the TPR decision metric; and
obtaining a TM of the interference signal from among predetermined TM candidates, based on the determined TF of the interference signal;
wherein the predetermined TM candidates comprise a first TM using a transmit diversity scheme and a second TM with a rank indicator (RI)=2 using a multiple input multiple output (MIMO) scheme.

2. The method of claim 1 , wherein the predetermined TF candidates comprise: a first TF comprising TM6 of a long term evolution (LTE) system with a precoding matrix indicator (PMI)=0, a second TF comprising TM6 with a PMI=1, a third TF comprising TM6 with a PMI=2, a fourth TF comprising TM6 with a PMI=3, and a fifth TF comprising TM2, TM3, and TM4.

3. The method of claim 1 , further comprising:
determining a TPR corresponding to the obtained TM of the interference signal.

4. The method of claim 1 , wherein the N projection vectors are Grassmannian vectors, and a value of N is one of 2, 4, and 8.

5. A method for determining an interference transmission mode (TM) at a communication device in a cellular communication system using a resource element (RE) defined by frequency and time, the method comprising:
receiving a first signal in two REs corresponding to consecutive subcarriers, the first signal comprising a serving signal and an interference signal;
projecting a first vector of the first signal onto each of M projection vectors;
determining a traffic-to-pilot ratio (TPR) decision metric using M pairs of an actual squared value and an expected squared value which are corresponding to the projected first vector; and
detecting, from among predetermined TM candidates, a TM of the interference signal which minimizes the TPR decision metric,
wherein the predetermined TM candidates comprise a first TM using a transmit diversity scheme and a second TM with a rank indicator (RI)=2 using a multiple input multiple output (MIMO) scheme.

6. The method of claim 5 , wherein the first TM is TM2 of a long term evolution (LTE) system, and the second TM is TM3 or TM4 of the LTE system.

7. The method of claim 5 , further comprising:
determining a TPR corresponding to the detected TM of the interference signal.

8. The method of claim 5 , wherein the M projection vectors are Grassmannian vectors, and a value of M is one of 2, 4, and 8.

9. A communication device in a cellular communication system using a resource element (RE) defined by frequency and time, the communication device comprising:
a transceiver configured to receive a first signal in one RE, the first signal comprising a serving signal and an interference signal; and
a controller configured to:
project a first vector of the received first signal onto each of N projection vectors,
determine a traffic-to-pilot ratio (TPR) decision metric of the interference signal using N pairs of an actual squared value and an expected squared value which are corresponding to the projected first vector,
determine, from among predetermined transmit format (TF) candidates, a TF of the interference signal which minimizes the TPR decision metric, and
obtain a TM of the interference signal from among predetermined TM candidates, based on the determined TF of the interference signal,

wherein the predetermined TM candidates comprise a first TM using a transmit diversity scheme and a second TM with a rank indicator (RI)=2 using a multiple input multiple output (MIMO) scheme.

10. The communication device of claim 9 , wherein the predetermined TF candidates comprise: a first TF comprising TM6 of a long term evolution (LTE) system with a precoding matrix indicator (PMI)=0, a second TF comprising TM6 with a PMI=1, a third TF comprising TM6 with a PMI=2, a fourth TF comprising TM6 with a PMI=3, and a fifth TF comprising TM2, TM3, and TM4.

11. The communication device of claim 9 ,
wherein the controller is further configured to determine a TPR corresponding to the obtained TM of the interference signal.

12. The communication device of claim 9 , wherein the N projection vectors are Grassmannian vectors, and a value of N is one of 2, 4, and 8.

13. The communication device of claim 9 , wherein the controller is further configured to cancel the interference signal from the first signal using the obtained TM of the interference signal.

14. A communication device in a cellular communication system using a resource element (RE) defined by frequency and time, the communication device comprising:
a transceiver configured to receive a first signal in two REs corresponding to consecutive subcarriers, the first signal comprising a serving signal and an interference signal; and
a controller configured to:
project a first vector of the first signal onto each of M projection vectors,
determine a traffic-to-pilot ratio (TPR) decision metric using M pairs of an actual squared value and an expected squared value which are corresponding to the projected first vector, and
determine, from among predetermined TM candidates, a TM of the interference signal which minimizes the TPR decision metric,

wherein the predetermined TM candidates comprise a first TM using a transmit diversity scheme and a second TM with a rank indicator (RI)=2 using a multiple input multiple output (MIMO) scheme.

15. The communication device of claim 14 , wherein the controller is further configured to determine a TPR corresponding to the determined TM of the interference signal.

16. The communication device of claim 14 , wherein the M projection vectors are Grassmannian vectors, and a value of M is one of 2, 4, and 8.

Assignees

• Lee Heun Chul
• Kim Sung Soo
• Lim Jong Han
• Cho Sung Yoon
• Samsung Electronics Co Ltd

Inventors

• Lee Heun-Chul
• Kim Sung-Soo
• Lim Jong-Han
• Cho Sung-Yoon

Classifications

• H04B7/0456

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

• H04J11/00

  Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence) · CPC title

• H04B7/0486 Primary

  taking channel rank into account · CPC title

• H04J11/005 Primary

  of intercell interference · CPC title