Wireless interference mitigation

Patent metadata

Field	Value
Publication number	US-9654313-B2
Application number	US-201314440335-A
Country	US
Kind code	B2
Filing date	Dec 3, 2013
Priority date	Dec 3, 2012
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

Embodiments relate to apparatus for wireless interference mitigation within a first User Equipment (UE). The apparatus comprises at least one channel estimator for estimating a first channel transfer function associated with a first received signal designated for the first UE, and for estimating a second channel transfer function associated with a second received, interference, signal. A symbol estimator is responsive to the at least one channel estimator to process at least the first received signal to produce a symbol estimation. A demodulator, which is responsive to the channel estimator, demodulates the symbol estimation to an output representing a received data unit corresponding to the symbol estimation. The demodulator has a processing unit arranged to demodulate the symbol estimation using the first channel transfer function, the second channel transfer function and a respective modulation scheme for at least the first received signal.

First claim

The invention claimed is:

1. An apparatus for wireless interference mitigation within a first User Equipment (UE), the apparatus comprising:
at least one channel estimator to estimate a first channel transfer function associated with a first received signal designated for the first UE, and to estimate a second channel transfer function associated with a second received, interference, signal based on information provided to the apparatus from a network about a reference signal associated with the second received signal, wherein the reference signal is a UE-specific reference signal or a cell-specific reference signal;
at least one symbol estimator, responsive to the at least one channel estimator, to process at least the first received signal to produce a symbol estimation; and
a demodulator, responsive to the channel estimator, operable to demodulate the symbol estimation to produce an output representing a received data unit corresponding to the symbol estimation; the demodulator comprising a processing unit arranged to demodulate the symbol estimation using the first channel transfer function and the second channel transfer function,
wherein the at least one symbol estimator comprises a symbol processor arranged to produce a set of signal candidates, ŝ(t i ), defined as ŝ(t i )=slice{(h h h) −1 h h (r−g·t i )}, where h is the channel transfer function on a given resource element for a serving channel, g is the channel transfer function on a given resource element for the serving channel, r is the received signal, t i is an element of a set T of all possible interfering signal candidates, the superscript h represents a Hermitian transpose, and the superscript −1 represents a matrix inverse.

2. The apparatus of claim 1 , in which the processing unit is operable to calculate the received data unit using an estimation computation.

3. The apparatus of claim 2 , in which the estimation computation is a Maximum Likelihood estimation computation.

4. The apparatus of claim 1 , wherein the information provided to the apparatus from the network about the reference signal is provided in downlink control information.

5. The apparatus of claim 1 , in which the reference signal comprises a UE-specific reference signal.

6. The apparatus of claim 4 , in which the downlink control information is further associated with the first received signal.

7. The apparatus of claim 4 , in which the downlink control information comprises a UE-specific reference signal parameter.

8. The apparatus of claim 7 , in which the UE-specific reference signal (RS) parameter comprises a virtual cell identifier of UE-specific RS, a scrambling sequence index (nSCID), or UE-specific antenna ports.

9. The apparatus of claim 4 , in which the downlink control information comprises a cell-specific reference signal (CRS) parameter.

10. The apparatus of claim 9 , in which the CRS parameter comprises at least one of a physical cell identifier, number of CRS antenna ports, and a Multimedia Broadcast Single Frequency Network (MBSFN) subframe configuration.

11. The apparatus of claim 4 , in which the downlink control information comprises at least one physical downlink shared channel (PDSCH) resource element mapping parameter.

12. The apparatus of claim 11 , in which the at least one PDSCH resource element mapping parameter comprises a physical cell identifier, number of cell-specific reference signals (CRS) antenna ports, CRS frequency shift, Multimedia Broadcast Single Frequency Network (MBSFN) subframe configuration, or a PDSCH starting symbol and PDSCH resource allocation.

13. An apparatus for wireless interference mitigation within a first User Equipment (UE), the apparatus comprising:
at least one channel estimator for estimating a first channel transfer function associated with a first received signal designated for the first UE, and for estimating a second channel transfer function associated with a second received, interference, signal;
at least one symbol estimator, responsive to the at least one channel estimator, to process at least the first received signal to produce a symbol estimation; and
a demodulator, responsive to the channel estimator, operable to demodulate the symbol estimation to produce an output representing a received data unit corresponding to the symbol estimation; the demodulator comprising a processing unit arranged to demodulate the symbol estimation using the first channel transfer function and the second channel transfer function,
wherein the at least one symbol estimator comprises a symbol processor arranged to produce a set of signal candidates, ŝ(t i ), defined as ŝ(t i )=slice{(h h h) −1 h h (r−g·t i )}, where h is the channel transfer function on a given resource element for a serving channel, g is the channel transfer function on a given resource element for the serving channel, r is the received signal, t i is an element of a set T of all possible interfering signal candidates, the superscript h represents a Hermitian transpose, and the superscript −1 represents a matrix inverse.

14. The apparatus of claim 13 , wherein the demodulator processing unit evaluates

s
=

arg
⁢

⁢
min

t
i

∈
T

⁢

⁢



r
-

g
·

t
i

-

h
⁢

s
^

⁡

(

t
i

)



2

in producing the output representing the received data unit.

Assignees

• Davydov Alexei
• Han Seunghee
• Morozov Gregory
• Maltsev Alexander
• Sergeyev Vadim
• Intel Corp

Inventors

• Davydov Alexei
• Han Seunghee
• Morozov Gregory
• Maltsev Alexander
• Sergeyev Vadim

Classifications

• H04W72/566

  of the information or information source or recipient · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/54

  based on quality criteria · CPC title

• H04W72/541

  using the level of interference · CPC title

• H04W72/12 Primary

  Wireless traffic scheduling · CPC title