Method and system for cancelling self-interference by a node in a wireless communication system

Patent metadata

Field	Value
Publication number	US-11018753-B2
Application number	US-201816492116-A
Country	US
Kind code	B2
Filing date	Feb 26, 2018
Priority date	Mar 7, 2017
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

Embodiments herein provide a method for decoding received signal by node in wireless communication system. The method includes receiving a signal from a first User Equipment (UE), where the received signal comprises a set of preambles in which each preamble is identical to an at least one preamble in a preamble structure and obtaining a composite signal comprising a self-interference signal, where the self-interference signal is known at the node. Further, the method includes determining self-interference channel estimate using the composite signal and decoding the received signal by eliminating the self-interference signal from the received signal based on the self-interference channel estimate.

First claim

We claim:

1. A method for decoding a received signal by a node in a wireless communication system, the method comprising:
receiving, by the node, a signal from a first User Equipment (UE), wherein the received signal includes the encoded data and a symmetric preamble structure, wherein the symmetric preamble structure comprises a set of preambles, wherein in each preamble is identical to at least one preamble in the symmetric preamble structure;
obtaining, a composite signal comprising a self-interference signal and the received signal, wherein composite signal is obtained when the received signal is added to the self-interference signal over the air, wherein the self-interference signal is known at the node;
determining, by the node, a difference between consecutive preambles in the composite signal using an adaptive filter;
determining, self-interference channel estimate using the composite signal based on the difference between consecutive preambles in the composite signal; and
decoding the received signal by eliminating the self-interference signal from the received signal, based on the self-interference channel estimate.

2. The method of claim 1 , wherein the self-interference estimates is determined using a filter which is adaptive.

3. The method of claim 1 , wherein the preamble is a portion of the signal received at the node from the UE.

4. A node for decoding a received signal in a wireless communication system, the node comprising:
a processor;
a memory coupled to the processor;
a transceiver coupled to the processor and the memory, configured to:
receive, a signal from a first User Equipment (UE), wherein the received signal includes the encoded data and a symmetric preamble structure, wherein the symmetric preamble structure comprises a set of preambles, wherein in each preamble is identical to an at least one successive preamble in the symmetric preamble structure;
obtain, a composite signal comprising a self-interference signal, and the received signal, wherein composite signal is obtained when the received signal is added to the self-interference signal over the air, wherein the self-interference signal is known at the node;
determine a difference between consecutive preambles in the composite signal using an adaptive filter;
determine self-interference channel estimates using the composite signal based on the difference between consecutive preambles in the composite signal; and
decode the received signal by eliminating the self-interference signal from the received signal, based on the self-interference channel estimate.

5. The node of claim 4 , wherein the self-interference estimates is determined using a filter which is adaptive.

6. The node of claim 4 , wherein the preamble is a portion of the signal received at the node from the UE.

Assignees

• Indian Inst Tech Madras
• Indian Institute Of Tech Madras

Inventors

• Ganti Radhakrishna
• Nadh Arjun

Classifications

• H04L25/0204

  of multiple channels · CPC title

• H04B1/525 Primary

  with means for reducing leakage of transmitter signal into the receiver · CPC title

• H04B7/15564

  Relay station antennae loop interference reduction · CPC title

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04B7/15585 Primary

  by interference cancellation · CPC title