Intercell frequency offset compensation for frequency domain interference cancellation and equalization for downlink cellular systems
AssigneeQUALCOMM Incorporated
InventorsSteve H. Hsu, Raheel Khan
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 time domain sequence is received, and a plurality of overlapping time domain segments is generated from the time domain sequence. Frequency offset compensation to compensate for frequency offset associated with a serving cell is performed in the time domain, and the overlapping time domain segments are then converted to the frequency domain. Additional frequency offset compensation may be performed to compensation for the frequency offset associated with interfering cells.
Claims18
A method for interference cancellation of interference components of a time domain signal in the frequency domain, comprising:
- receiving a time domain sequence;
- generating a plurality of overlapping time domain segments from the time domain sequence;
- performing a serving cell frequency compensation operation on the overlapping time domain segments to compensate for frequency offset associated with a serving cell;
- converting the plurality of overlapping time domain segments into a plurality of frequency domain segments;
- performing a first interference cell frequency offset compensation operation during an equalization phase of the interference cancellation;
- and
- performing a second interference cell frequency offset compensation operation during a reconstruction phase of the interference cancellation.
A non-transitory computer-readable medium, comprising:
- at least one instruction for causing a computer to:
- receive a time domain sequence;
- generate a plurality of overlapping time domain segments from the time domain sequence;
- perform a serving cell frequency compensation operation on the overlapping time domain segments to compensate for frequency offset associated with a serving cell;
- convert the plurality of overlapping time domain segments into a plurality of frequency domain segments;
- perform a first interference cell frequency offset compensation operation during an equalization phase of the interference cancellation;
- and
- perform a second interference cell frequency offset compensation operation during a reconstruction phase of the interference cancellation.
An apparatus, comprising:
- means for receiving a time domain sequence;
- means for generating a plurality of overlapping time domain segments from the time domain sequence;
- means for performing a serving cell frequency compensation operation on the overlapping time domain segments to compensate for frequency offset associated with a serving cell;
- means for converting the plurality of overlapping time domain segments into a plurality of frequency domain segments;
- means for performing a first interference cell frequency offset compensation operation during an equalization phase of the interference cancellation;
- and
- means for performing a second interference cell frequency offset compensation operation during a reconstruction phase of the interference cancellation.
An apparatus for compensating for frequency offset 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;
- generate a plurality of overlapping time domain segments from the time domain sequence;
- perform a serving cell frequency compensation operation on the overlapping time domain segments to compensate for frequency offset associated with a serving cell;
- convert the plurality of overlapping time domain segments into a plurality of frequency domain segments;
- perform a first interference cell frequency offset compensation operation during an equalization phase of the interference cancellation;
- and
- perform a second interference cell frequency offset compensation operation during a reconstruction phase of the interference cancellation;
- and
- a memory coupled to the at least one processor.
Dependencies are inferred from the claim text.