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US 9,124,452 B2Granted
Apparatus and method for iterative interference cancellation in a wireless communication network
AssigneeQUALCOMM Incorporated
InventorsChun-Hao Hsu, Aditya Dua, Nathan Dingsai Yee, Abhinav Gupta
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Abstract
One or more aspects of the disclosure provide an efficient equalization scheme capable of mitigating multi-path interference on channels with large delay spread using short-length equalizers. That is, by dividing stored samples of a signal received on the multi-path channel by time into a plurality of clusters, a short-length equalizer can be utilized in an iterative fashion on each of the clusters, thus eliminating the need for a large length equalizer while still providing improved performance over that of a Rake receiver at large delay spreads. Other aspects, embodiments, and features are also claimed and described.
Claims15
A receiver configured for wireless communication, comprising:
- a memory configured for storing samples of a received signal;
- and
- an equalization filter configured to use a cluster selection index for selecting and filtering at least a portion of the stored samples of the received signal in accordance with a separation of the received signal into a plurality of clusters by, for each cluster:
- selecting the cluster from among the plurality of clusters that corresponds to the cluster selection index;
- filtering the selected cluster that corresponds to the cluster selection index;
- and
- incrementing the cluster selection index, wherein each cluster corresponds to a plurality of paths of a multipath channel experienced by the received signal from a source, and wherein each cluster of the plurality of clusters is filtered by the same equalization filter.
4 more elements
A method of wireless communication, comprising:
- receiving a signal corresponding to a transmission from a source;
- separating the received signal into a plurality of clusters, each cluster corresponding to a plurality of paths of a multipath channel experienced by the received signal from the source;
- configuring an equalization filter in accordance with the clusters, such that an equalization filter length of the equalization filter corresponds to a width of at least one of the plurality of clusters;
- and
- processing the received signal using a cluster selection index to apply the equalization filter to each of the plurality of clusters by, for each cluster:
- selecting the cluster from among the plurality of clusters that corresponds to the cluster selection index;
- applying the equalization filter to the selected cluster that corresponds to the cluster selection index;
- and
- incrementing the cluster selection index, wherein the same equalization filter is applied to each of the plurality of clusters.
6 more elements
A receiver configured for wireless communication, comprising:
- means for storing samples of a received signal;
- and
- means for using a cluster selection index to select and to filter at least a portion of the stored samples of the received signal in accordance with a separation of the received signal into a plurality of clusters by, for each cluster:
- selecting the cluster from among the plurality of clusters that corresponds to the cluster selection index;
- filtering the selected cluster that corresponds to the cluster selection index using an equalization filter;
- and
- incrementing the cluster selection index, wherein each cluster corresponds to a plurality of paths of a multipath channel experienced by the received signal from a source, and wherein each cluster of the plurality of clusters is filtered by the same equalization filter.
4 more elements
A method of wireless communication, comprising:
- means for receiving a signal corresponding to a transmission from a source;
- means for separating the received signal into a plurality of clusters, each cluster corresponding to a plurality of paths of a multipath channel experienced by the received signal from the source;
- means for configuring an equalization filter in accordance with the clusters, such that an equalization filter length of the equalization filter corresponds to a width of at least one of the plurality of clusters;
- and
- means for processing the received signal using a cluster selection index to apply the equalization filter to each of the plurality of clusters by, for each cluster:
- selecting the cluster from among the plurality of clusters that corresponds to the cluster selection index;
- applying the equalization filter to the selected cluster that corresponds to the cluster selection index;
- and
- incrementing the cluster selection index, wherein the same equalization filter is applied to each of the plurality of clusters.
6 more elements
A computer-readable storage medium operable at a receiving device, comprising instructions for causing a computer to:
- store samples of a received signal;
- and
- use a cluster selection index to filter at least a portion of the stored samples of the received signal in accordance with a separation of the received signal into a plurality of clusters by, for each cluster:
- selecting the cluster from among the plurality of clusters that corresponds to the cluster selection index;
- applying an equalization filter to the selected cluster that corresponds to the cluster selection index;
- and
- incrementing the cluster selection index, wherein each cluster corresponds to a plurality of paths of a multipath channel experienced by the received signal from a source, wherein each cluster of the plurality of clusters is filtered by the same equalization filter.
4 more elements
A computer-readable storage medium comprising instructions for causing a computer to:
- receive a signal corresponding to a transmission from a source;
- separate the received signal into a plurality of clusters, each cluster corresponding to a plurality of paths of a multipath channel experienced by the received signal from the source;
- configure an equalization filter in accordance with the clusters, such that an equalization filter length of the equalization filter corresponds to a width of at least one of the plurality of clusters;
- and
- process the received signal using a cluster selection index to apply the equalization filter to each of the plurality of clusters by, for each cluster:
- selecting the cluster from among the plurality of clusters that corresponds to the cluster selection index;
- applying the equalization filter to the selected cluster that corresponds to the cluster selection index;
- and
- incrementing the cluster selection index, wherein the same equalization filter is applied to each of the plurality of clusters.
6 more elements
A receiver configured for wireless communication, comprising:
- at least one processor;
- a memory communicatively coupled to the at least one processor;
- and
- a communication interface communicatively coupled to the at least one processor, wherein the at least one processor is configured to:
- receive a signal corresponding to a transmission from a source;
- separate the received signal into a plurality of clusters, each cluster corresponding to a plurality of paths of a multipath channel experienced by the received signal from the source;
- configure an equalization filter in accordance with the clusters, such that an equalization filter length of the equalization filter corresponds to a width of at least one of the plurality of clusters;
- and
- process the received signal using a cluster selection index to apply the equalization filter to each of the plurality of clusters by, for each cluster:
- selecting the cluster from among the plurality of clusters that corresponds to the cluster selection index;
- applying the equalization filter to the selected cluster that corresponds to the cluster selection index;
- and
- incrementing the cluster selection index, wherein the same equalization filter is applied to each of the plurality of clusters.
10 more elements
Dependencies are inferred from the claim text.