Frequency domain interference cancellation and equalization for downlink cellular systems
AssigneeQUALCOMM Incorporated
InventorsRaheel Khan, Steve H. Hsu
Life of this patent
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Abstract
Methods and apparatus are described for interference cancellation of interference components of a time domain signal in the frequency domain. A communications device receives a time domain sequence and generates overlapping time domain segments from the time domain sequence. The overlapping time domain segments are then converted to the frequency domain to generate frequency domain representations of the overlapping time domain segments. The frequency domain representations are stored in a residual memory, and interference components are directly removed from the frequency domain representations stored in the residual memory in the frequency domain.
Claims16
A method for interference cancellation of interference components of a time domain signal in the frequency domain, comprising:
- receiving a time domain sequence including a waveform transmitted by a transmitting device;
- generating a plurality of overlapping time domain segments from the time domain sequence;
- converting the plurality of overlapping time domain segments into the frequency domain to generate frequency domain segments comprising frequency domain representations of the overlapping time domain segments;
- storing the frequency domain segments in a residual memory;
- and
- directly removing the interference components from the frequency domain segments stored in the residual memory in the frequency domain.
A non-transitory computer-readable medium, comprising:
- at least one instruction for causing a computer to receive a time domain sequence including a waveform transmitted by a transmitting device;
- at least one instruction for causing the computer to generate a plurality of overlapping time domain segments from the time domain sequence;
- at least one instruction for causing the computer to convert the plurality of overlapping time domain segments into the frequency domain to generate frequency domain segments comprising frequency domain representations of the overlapping time domain segments;
- at least one instruction for causing the computer to store the frequency domain segments in a residual memory;
- and
- at least one instruction for causing the computer to directly remove the interference components from the frequency domain segments stored in the residual memory in the frequency domain.
An apparatus, comprising:
- means for receiving a time domain sequence including a waveform transmitted from a transmitting device;
- means for generating a plurality of overlapping time domain segments from the time domain sequence;
- means for converting the plurality of overlapping time domain segments into the frequency domain to generate frequency domain segments comprising frequency domain representations of the overlapping time domain segments;
- means for storing the frequency domain segments in a residual memory;
- and
- means for directly removing the interference components from the frequency domain segments stored in the residual memory in the frequency domain.
An apparatus for interference cancellation of interference components of a time domain signal in the frequency domain, comprising:
- at least one processor configured to:
- receive a time domain sequence including a waveform transmitted from a transmitting device;
- generate a plurality of overlapping time domain segments from the time domain sequence;
- convert the plurality of overlapping time domain segments into the frequency domain to generate frequency domain segments comprising frequency domain representations of the overlapping time domain segments;
- store the frequency domain segments in a residual memory;
- and
- directly remove the interference components from the frequency domain segments stored in the residual memory in the frequency domain;
- and
- a memory coupled to the at least one processor.
Dependencies are inferred from the claim text.