Method and Apparatus for Reducing Self Interference
A method, apparatus, and computer program product are provided to reduce self-interference in a transceiver. In the context of a method, a self-interference channel estimate may be determined. A reconstructed interference may further be determined based at least in part on the self-interference channel estimate and a signal to be transmitted and the reconstructed self-interference is caused to be subtracted from a received signal. According to a further embodiment, detection of a desired signal may be disabled while this process is repeated until a residual self-interference is below a threshold, at which point detection of the desired signal may be enabled.
1 . A method for use in a transceiver comprising:
determining a self-interference channel estimate;
causing a reconstructed self-interference to be determined based at least in part on the self-interference channel estimate and a signal to be transmitted; and
causing the reconstructed self-interference to be subtracted from a received signal.
2 . The method of claim 1 , further comprising:
determining, based at least in part on a signal resulting from subtraction of the reconstructed self-interference from the received signal, a residual self-interference;
determining whether the residual self-interference is less than a threshold; and
in an instance in which the residual self-interference is less than the threshold, causing detection of a desired signal to be enabled.
3 . The method of claim 2 , further comprising, in an instance in which the residual self-interference is not less than the threshold:
determining, based at least in part on the self-interference channel estimate and the signal resulting from subtracting the reconstructed self-interference from the received signal, an updated self-interference channel estimate; and
causing an updated reconstructed self-interference to be determined based at least in part on the updated self-interference channel estimate and the signal to be transmitted.
4 . The method of claim 2 , wherein the self-interference channel estimate comprises a previous self-interference channel estimate and further comprising, in an instance in which the residual self-interference is less than the threshold, fixing the self-interference channel estimate.
5 . The method of claim 4 , further comprising, in an instance in which the residual self-interference is less than the threshold:
causing an updated reconstructed self-interference to be determined based at least in part on the fixed self-interference channel estimate and the signal to be transmitted.
6 - 14 . (canceled)
15 . An apparatus for use in a transceiver, the apparatus comprising a processing system comprising at least one processor and at least one memory, wherein the processing system is arranged to cause the apparatus to:
determine a self-interference channel estimate;
cause a reconstructed self-interference to be determined based at least in part on the self-interference channel estimate and a signal to be transmitted; and
cause the reconstructed self-interference to be subtracted from a received signal.
16 . The apparatus of claim 15 , wherein the processing system is further arranged to cause the apparatus to:
determine, based at least in part on a signal resulting from subtraction of the reconstructed self-interference from the received signal, a residual self-interference;
determine whether the residual self-interference is less than a threshold; and
in an instance in which the residual self-interference is less than the threshold, cause detection of a desired signal to be enabled.
17 . The apparatus of claim 16 , wherein the processing system is further arranged to cause the apparatus to:
determine, based at least in part on the self-interference channel estimate and the signal resulting from subtracting the reconstructed self-interference from the received signal, an updated self-interference channel estimate; and
cause an updated reconstructed self-interference to be determined based at least in part on the updated self-interference channel estimate and the signal to be transmitted.
18 . The apparatus of claim 16 , wherein the processing system is further arranged to cause the apparatus to, in an instance in which the residual self-interference is less than the threshold, fix the self-interference channel estimate.
19 . The apparatus of claim 18 , wherein the processing system is further arranged to, in an instance in which the residual self-interference is less than the threshold:
cause an updated reconstructed self-interference to be determined based at least in part on the fixed self-interference channel estimate and the signal to be transmitted.
20 . The apparatus of claim 16 , wherein the processing system is further arranged to cause the apparatus to, in an instance in which the residual self-interference is less than the threshold, cause a transceiver to be informed of the signal to be transmitted.
21 . The apparatus of claim 15 , wherein the processing system is further arranged to cause the apparatus to:
cause detection of a desired signal to be disabled;
initialize the self-interference channel estimate to 0; and
cause a first variable gain amplifier (VGA) and a second VGA to be initialized to respective default amplifying scales.
22 . The apparatus of claim 15 , wherein the processing system is further arranged to cause the apparatus to cause a first VGA to be tuned based on a signal power of the received signal.
23 . The apparatus of claim 15 , wherein the processing system is further arranged to cause the apparatus to cause a second VGA to be tuned based on a power of a signal resulting from subtraction the reconstructed self-interference from the received signal.
24 . The apparatus of claim 15 , wherein the received signal comprises an analog baseband signal.
25 . The apparatus of claim 15 , wherein the apparatus is caused to cause the reconstructed self-interference to be determined based at least in part on the self-interference channel estimate and the signal to be transmitted by causing the self-interference channel estimate to be provided to a digital filter.
26 . The apparatus of claim 15 , wherein the apparatus is caused to cause the reconstructed self-interference to be determined based at least in part on the self-interference channel estimate and the signal to be transmitted by causing a third VGA to be tuned based on the self-interference channel estimate.
27 . The apparatus of claim 15 , wherein the apparatus is further caused to cause the first and second VGA to be simultaneously tuned based on an output of an automatic gain control element.
28 . The apparatus of claim 15 , wherein the transceiver is embodied by a user equipment or an access point of a wireless communication system.
29 . A computer-readable memory for use in a transceiver, the computer-readable memory comprising a computer-executed program code, the computer program code portions being arranged to, upon execution, cause the apparatus to at least:
determine a self-interference channel estimate;
cause a reconstructed self-interference to be determined based at least in part on the self-interference channel estimate and a signal to be transmitted; and
cause the reconstructed self-interference to be subtracted from a received signal.
30 - 56 . (canceled)