Beam forming with double-null-steering for in-band on-channel reception

Patent metadata

Field	Value
Publication number	US-9838100-B2
Application number	US-201414546576-A
Country	US
Kind code	B2
Filing date	Nov 18, 2014
Priority date	Nov 18, 2014
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

Various exemplary embodiments relate to a method for improving reception of transmissions with first adjacent interference signals, the method including selecting one or more time samples from each of two or more antennas; generating a lower first adjacent interference (LFAI) signal, a desired signal, and an upper first adjacent interference (UFAI) signal for each of the time samples; calculating a lower weighting co-efficient based on the LFAI signal; calculating a middle weighting co-efficient based on the desired signal; calculating a upper weighting co-efficient based on the UFAI signal; combining the lower weighting co-efficient with a filtered LFAI signal into a weighted lower signal; combining the middle weighting co-efficient with a filtered desired signal into a weighted middle signal; combining the upper weighting co-efficient with a filtered UFAI signal into a weighted upper signal; and combining the weighted lower signal, the weighted middle signal, and the weighted upper signal.

First claim

What is claimed is:

1. A method for improving reception of transmissions with first adjacent interference signals, the method comprising:
selecting, with one or more baseband blocks, a plurality of time samples from each of two or more antennas;
generating, with a training block, a lower first adjacent interference (LFAI) signal, a desired signal, and an upper first adjacent interference (UFAI) signal for the plurality of time samples as a plurality of training signals;
calculating, with a coefficient-update block, a lower weighting co-efficient based on the LFAI signal;
calculating, with the coefficient-update block, a middle weighting co-efficient based on the desired signal;
calculating, with the coefficient-update block, an upper weighting co-efficient based on the UFAI signal;
combining, with one or more finite impulse response (FIR) filter blocks, the lower weighting co-efficient with a filtered LFAI signal into a weighted lower signal;
combining, with the one or more finite impulse response (FIR) filter blocks, the middle weighting co-efficient with a filtered desired signal into a weighted middle signal;
combining, with the one or more finite impulse response (FIR) filter blocks, the upper weighting co-efficient with a filtered UFAI signal into a weighted upper signal; and
combining, with a combiner block, the weighted lower signal, the weighted middle signal, and the weighted upper signal to output a beamformer I/Q signal.

2. The method of claim 1 , wherein calculating the lower weighting co-efficient based on the LFAI signal further comprises:
shifting the LFAI signal to zero; and calculating the upper weighting co-efficient based on the UFAI signal further comprises:
shifting the UFAI signal to zero.

3. The method of claim 1 , wherein calculating the lower weighting co-efficient based on the LFAI signal further comprises:
filtering the LFAI signal to include the lowest half of the LFAI signal; calculating a middle weighting co-efficient based on the desired signal further comprises:
filtering the desired signal to include the middle portion of the desired signal which comprises half the desired signal; and calculating the upper weighting co-efficient based on the UFAI signal further comprises:
filtering the UFAI signal to include the upper-most half of the LFAI signal.

4. The method of claim 1 , wherein calculating the lower weighting co-efficient based on the LFAI signal further comprises:
generating an inverse co-variance matrix based on the LFAI signal; calculating a middle weighting co-efficient based on the desired signal further comprises:
generating an inverse co-variance matrix based on the desired signal; and calculating the upper weighting co-efficient based on the UFAI signal further comprises:
generating an inverse co-variance matrix based on the UFAI signal.

5. The method of claim 1 , wherein calculating the lower weighting co-efficient based on the LFAI signal further comprises:
calculating a lower weighting co-efficient that maximizes the Signal-to-Interference-plus-Noise-Ratio (SINR) of the LFAI signal; calculating a middle weighting co-efficient based on the desired signal further comprises:
calculating a middle weighting co-efficient that maximizes the SINR of the desired signal; and calculating the upper weighting co-efficient based on the UFAI signal further comprises:
calculating an upper weighting co-efficient that maximizes the SINR of the UFAI signal.

6. The method of claim 1 , further comprising:
generating a filtered LFAI signal;
generating a filtered desired signal; and
generating a filtered UFAI signal.

7. The method of claim 6 , wherein generating the filtered LFAI signal further comprises:
shifting the LFAI signal to zero; and generating the filtered UFAI signal further comprises:
shifting the UFAI signal to zero.

8. The method of claim 7 , wherein generating the filtered LFAI signal further comprises:
filtering the LFAI signal to include a lower digital sideband; generating the filtered desired signal further comprises:
filtering the desired signal to include an analog band; and generating the filtered UFAI signal further comprises:
filtering the UFAI signal to include an upper digital sideband.

9. A device for improving reception of transmissions with first adjacent interference signals, the device comprising:
an antenna array comprising two or more antennas;
a radio front-end block comprising one or more radio front ends connected to each of the two or more antennas;
one or more analog-to-digital converters connected to the one or more radio front-ends;
one or more baseband blocks connected to the one or more analog-to-digital converters; and
a digital adaptive beam-former block connected to each of the one or more baseband blocks

the digital adaptive beam-former block further comprising:
a training block connected to each of the one or more baseband blocks;
a coefficient-update block connected to the training block;
one or more finite impulse response (FIR) filter blocks connected to the coefficient-update block and each of the one or more baseband blocks; and
a combiner block connected to each of the one or more FIR filter blocks; and wherein
the one or more baseband blocks are configured to select a plurality of time samples from each of the two or more antennas;

the training block is configured to
generate a lower first adjacent interference (LFAI) signal for the plurality of time samples,
generate a desired signal for each of the plurality of time samples, and
generate an upper first adjacent interference (UFAI) signal for each of the a plurality of time samples; and

the coefficient-update block is configured to
calculate a lower weighting co-efficient based on the LFAI signal,
calculate a middle weighting co-efficient based on the desired signal, and
calculate an upper weighting co-efficient based on the UFAI signal.

10. The device of claim 9 , wherein:
the coefficient-update block is further configured to generate an inverse co-variance matrix based on the LFAI signal, generate an inverse co-variance matrix based on the desired signal, and generate an inverse co-variance matrix based on the UFAI signal.

11. The device of claim 9 , wherein: the coefficient-update block is further configured to
calculate a lower weighting co-efficient that maximizes the Signal-to-Interference-plus-Noise-Ratio (SINR) of the LFAI signal,
calculate a middle weighting co-efficient that maximizes the SINR of the desired signal, and
calculate an upper weighting co-efficient that maximizes the SINR of the UFAI signal.

12. The device of claim 9 , wherein: the one or more finite impulse response (FIR) filter blocks is configured to
generate a filtered lower first adjacent interference (LFAI) signal,
generate a filtered desired signal, and
generate a filtered upper first adjacent interference (UFAI) signal.

13. The device of claim 12 , wherein: the one or more finite impulse response (FIR) filter blocks is further configured to
shift the LFAI signal to zero, and
shift the UFAI signal to zero.

14. The device of claim 12 , wherein: the one or more finite impulse response (FIR) filter blocks is further configured to
filter the LFAI signal to include a lower digital sideband,
filter the desired signal to include an analog band, and
filter the UFAI signal to include an upper digital sideband.

15. The device of claim 12 , wherein: the one or more finite impulse response (FIR) filter blocks is further configured to
combine a lower weighting co-efficient with the filtered LFAI signal into a we

Assignees

• Nxp Bv

Inventors

• Van Houtum Wim

Classifications

• H04B1/1036

  with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters (H04B1/123 takes precedence; filter circuits H03H) · CPC title

• H04B7/0617 Primary

  for beam forming · CPC title