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US 2006/0141934 A1Published application
Traffic interference cancellation
AssigneeQUALCOMM Incorporated
InventorsHenry Pfister, Jilei Hou, John Smee, Stefano Tomasin
Life of this patent
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Abstract
A method and system for interference cancellation (IC). One aspect relates to traffic interference cancellation. Another aspect relates to joint IC for pilot, overhead and data. Another aspect relates to improved channel estimation. Another aspect relates to adaptation of transmit subchannel gains.
Claims34
A method to reduce interference, the method comprising:
- storing samples of data frames transmitted asynchronously from a plurality of access terminals;
- attempting to decode a first frame of data from the stored samples, the first frame of data sent from a first group of one or more access terminals;
- if the first frame of data is correctly decoded, subtracting the decoded first frame from the stored samples;
- attempting to decode a second frame of data from the stored samples, the second frame of data sent from a second group of one or more access terminals;
- if the second frame of data is correctly decoded, subtracting the decoded second frame from the stored samples;
- and
- attempting to decode a frame that failed to previously decode.
4 more elements
A method to reduce interference, the method comprising:
- storing time-interlaced subpackets received from a plurality of access terminals, each subpacket corresponding to an encoded data packet;
- attempting to decode a first data packet using one or more stored, time-interlaced subpackets;
- if attempting to decode the first packet is successful, reconstructing one or more subpackets corresponding to the first packet;
- subtracting the reconstructed subpackets from the stored time-interlaced subpackets;
- and
- attempting to decode a second packet using one or more stored, time-interlaced subpackets.
3 more elements
A base station comprising:
- a front-end memory configured to store samples of time-interlaced signals received from a plurality of access terminals;
- a demodulator configured to demodulate the stored samples using a first code sequence corresponding to a first access terminal;
- a decoder configured to decode data from the demodulated samples;
- a reconstruction unit configured to use decoded data to reconstruct encoded and modulated samples;
- and
- a subtractor configured to subtract reconstructed samples from the samples stored in the front-end memory to reduce interference for the decoder to subsequently decode data from the stored samples.
3 more elements
Dependencies are inferred from the claim text.