Joint space-time optimum filters (JSTOF) for interference cancellation
AssigneeResearch In Motion Limited
InventorsHuan Wu, Sean Simmons, Zoltan Kemenczy
Life of this patent
Estimating the term…
Abstract
A filter for reducing co-channel interference within a communications receiver may include a multi-channel, space-time filter circuit that filters n signal parts that have been split from a communications signal by jointly estimating space-time filter weights and multi-channel impulse responses (CIRs). The filter may further include a multi-channel, matched filter circuit that receives multi-channel signals from the multi-channel, space-time filter circuit and has a filter response that is provided by a channel impulse response estimation from the space-time filter circuit.
Claims39
A filter for reducing co-channel interference within a communications receiver comprising:
- a multi-channel, space-time filter circuit that filters n signal parts that have been split from a communications signal by jointly estimating space-time filter weights and multi-channel impulse responses (CIRs);
- and
- a multi-channel, matched filter circuit that receives multi-channel signals from the multi-channel, space-time filter circuit and having a filter response that is provided by a channel impulse response estimation from the space-time filter circuit.
A filter system for reducing co-channel interference within a communications receiver, comprising:
- a joint space-time filter comprising
- a multi-channel, space-time filter circuit that filters n signal parts that have been split from a communications signal by jointly estimating space-time filter weights and multi-channel impulse responses (CIRs), and
- a multi-channel, matched filter circuit that receives multi-channel signals from the multi-channel, space-time filter circuit and having a filter response that is provided by a channel impulse response estimation from the space-time filter circuit;
- and
- an alternative filter operative when an interference level is below a predetermined threshold and comprising a matched filter, a cross-correlation circuit, and a switch mechanism for switching the n signal parts into the matched filter and cross-correlation circuit.
A method of reducing co-channel interference within a communications receiver comprising:
- splitting a communications signal into n signal parts;
- filtering the n signal parts within a multi-channel, space-time filter circuit and jointly estimating space-time filter weights and multi-channel channel impulse responses (CIRs);
- and
- receiving multi-channel signals from the space-time filter circuit within a multi-channel matched filter circuit having a filter response that is provided by a channel impulse response estimation from the space-time filter circuit.
A wireless communications device comprising:
- a wireless transmitter and a wireless receiver;
- said wireless receiver comprising a filter for reducing co-channel interference within a communications receiver and comprising
- a multi-channel, space-time filter circuit that filters n signal parts that have been split from a communications signal by jointly estimating space-time filter weights and multi-channel impulse responses (CIRs), and
- a multi-channel, matched filter circuit that receives multi-channel signals from the multi-channel, space-time filter circuit and having a filter response that is provided by a channel impulse response estimation from the multi-channel space-time filter circuit.
Dependencies are inferred from the claim text.