Capacity enhancement in a wireless communications system using distributed asynchronous multi-user detection
One or more aspects of the present disclosure are directed to techniques for interference cancellation in the present of Multi-User Interference (MUI). In one aspect, a method includes receiving a mixture signal at a receiver, the mixture signal including a first intended signal and at least one interfering signal overlappingly transmitted with the first intended signal; processing the mixture signal to identify the at least one interfering signal, the processing including at least applying an adaptive filtering to a re-modulated version of each of the at least one interfering signal to yield at least one reconstructed interfering signal; and determining the first intended signal using the mixture signal and the at least one reconstructed interfering signal.
1 . A method comprising;
receiving a mixture signal at a receiver, the mixture signal including a first intended signal and at least one interfering signal overlappingly transmitted with the first intended signal;
processing the mixture signal to identify the at least one interfering signal, the processing including at least applying an adaptive filtering to a re-modulated version of each of the at least one interfering signal to yield at least one reconstructed interfering signal; and
determining the first intended signal using the mixture signal and the at least one reconstructed interfering signal.
2 . The method of claim 1 , wherein the processing comprises:
performing parameter estimation on the mixture signal to determine one or more characteristics of the first intended signal and the at least one interfering signal;
identifying the at least one interfering signal based on the one or more characteristics of the first intended signal and the at least one interfering signal; and
processing the at least one interfering signal.
3 . The method of claim 2 , wherein processing the at least one interfering signal comprises:
de-modulating the at least one interfering signal to yield at least one de-modulated interfering signal; and
re-modulating the at least one de-modulated interfering signal to yield the re-modulated version of each of the at least one interfering signal.
4 . The method of claim 2 , wherein the parameter estimation is performed using Cross Layer Sensing.
5 . The method of claim 1 , wherein the adaptive filtering is a Recursive Least Squares (RLS) adaptive filtering.
6 . The method of claim 1 , wherein determining the first intended signal comprises:
subtracting the at least one reconstructed interfering signal from the mixture signal to yield an estimated first intended signal;
de-modulating the estimated first intended signal to yield a de-modulated first intended signal; and
applying a Forward Error Correction (FEC) to recover the first intended signal.
7 . The method of claim 1 , wherein the first intended signal and the at least one interfering signal are overlappingly transmitted in one or more of a frequency domain or a time domain.
8 . The method of claim 1 , wherein the mixture signal is a signal transmitted within a tactical data link network.
9 . The method of claim 1 , wherein the mixture signal is a wireless signal transmitted within a Wi-Fi system.
10 . The method of claim 1 , wherein the first intended signal and the at least one interfering signal are wireless signals associated with different wireless communication protocols.
11 . An apparatus comprising:
one or more memories having computer-readable instructions stored therein; and
one or more processors configured to execute the computer-readable instructions to:
receive a mixture signal, the mixture signal including a first intended signal and at least one interfering signal overlappingly transmitted with the first intended signal;
process the mixture signal to identify the at least one interfering signal, the processing including at least applying an adaptive filtering to a re-modulated version of each of the at least one interfering signal to yield at least one reconstructed interfering signal; and
determine the first intended signal using the mixture signal and the at least one reconstructed interfering signal.
12 . The apparatus of claim 11 , wherein the one or more processors are configured to execute the computer-readable instructions to process the mixture signal by:
performing parameter estimation on the mixture signal to determine one or more characteristics of the first intended signal and the at least one interfering signal;
identifying the at least one interfering signal based on the one or more characteristics of the first intended signal and the at least one interfering signal; and
processing the at least one interfering signal.
13 . The apparatus of claim 12 , wherein the one or more processors are configured to execute the computer-readable instructions to process the at least one interfering signal by:
de-modulating the at least one interfering signal to yield at least one de-modulated interfering signal; and
re-modulating the at least one de-modulated interfering signal to yield the re-modulated version of each of the at least one interfering signal.
14 . The apparatus of claim 12 , wherein the one or more processors are configured to execute the computer-readable instructions to perform parameter estimation using Cross Layer Sensing.
15 . The apparatus of claim 11 , wherein the adaptive filter is a Recursive Least Squares (RLS) adaptive filtering.
16 . The apparatus of claim 11 , wherein the one or more processors are configured to execute the computer-readable instructions to determine the first intended signal by:
subtracting the at least one reconstructed interfering signal from the mixture signal to yield an estimated first intended signal;
de-modulating the estimated first intended signal to yield a de-modulated first intended signal; and
applying a Forward Error Correction to recover the first intended signal.
17 . The apparatus of claim 11 , wherein the first intended signal and the at least one interfering signal are overlappingly transmitted in one or more of a frequency domain or a time domain.
18 . The apparatus of claim 11 , wherein the mixture signal is a signal transmitted within a tactical data link network.
19 . The apparatus of claim 11 , wherein the mixture signal is a wireless signal transmitted within a Wi-Fi system.
20 . The apparatus of claim 11 , wherein the first intended signal and the at least one interfering signal are wireless signals associated with different wireless communication protocols.