US 12,732,240 B2 · MIMO interference cancellation

Abstract

A multiple input, multiple output, MIMO, antenna arrangement comprising: a transmit hybrid circuit connected to receive first and second transmit signals, and to output a sum of the first and second transmit signals, and to output a difference of the first and second transmit signals, a first antenna connected to receive the output sum; a second antenna connected to receive the output difference; a receive hybrid circuit connected to receive signals from the first and second antennas, and to output a sum of the signals from the first and second antennas, and to output a difference of the first and second antenna signals; a first cancellation circuit connected to receive the first transmit signal and configured to compensate for the interference due to the first transmit path; a second cancellation circuit connected to receive the second transmit signal and configured to compensate for the interference due to the second transmit path; wherein: the sum output of the receive hybrid circuit and the output of the first cancellation circuit are combined to generate a first receive signal; and the difference output of the receive hybrid circuit and the output of the second cancellation circuit are combined to generate a second receive signal.

Claims20

Dependent claims

A multiple input, multiple output, MIMO, antenna arrangement comprising:

a transmit hybrid circuit connected to receive first and second transmit signals, and to output a sum of the first and second transmit signals, and to output a difference of the first and second transmit signals,
a first antenna connected to receive the output sum;
a second antenna connected to receive the output difference;
a receive hybrid circuit connected to receive signals from the first and second antennas, and to output a sum of the signals from the first and second antennas, and to output a difference of the first and second antenna signals;
a first cancellation circuit connected to receive the first transmit signal and configured to compensate for an interference due to a first transmit path;
a second cancellation circuit connected to receive the second transmit signal and configured to compensate for an interference due to a second transmit path;
wherein:
the sum output of the receive hybrid circuit and the output of the first cancellation circuit are combined to generate a first receive signal;
and
the difference output of the receive hybrid circuit and the output of the second cancellation circuit are combined to generate a second receive signal.

7 more elements

A method of transmitting and receiving in a multiple input, multiple output, MIMO, antenna arrangement, the method comprising:

receiving first and second transmit signals;
outputting a sum of the first and second transmit signals to a first antenna;
outputting a difference of the first and second transmit signals to a second antenna;
receiving first and second signals from the first and second antennas in first and second receive paths;
outputting a sum of the signals received from the first and second antennas;
outputting a difference of the signals received from the first and second antenna signals;
determining an interference in the first receive path due to the first transmit signal;
determining an interference in the second receive path due the second transmit signal;
combining the sum output of the signals received from the first and second antennas and an inverse of the determined interference in the first receive path due to the first transmit signal to generate a first received signal;
and
combining the difference output of the signals received from the first and second antennas and an inverse of the determined interference in the second receive path due to the second transmit signal to generate a second received signal.

8 more elements

Dependencies are inferred from the claim text.

MIMO interference cancellation

Life of this patent

MIMO interference cancellation

Life of this patent

Abstract

Claims20