Sub-symbol parallel inteference cancellation
AssigneeThe MITRE Corporation
InventorsJames Dunyak, John Fite, Jerome Shapiro
Life of this patent
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Abstract
Reduction of multiple access interference, in one example for asynchronous CDMA systems using long codes. In one aspect, parallel interference cancellation (PIC) implements a decoupled estimate, preferably non-linear and applied at chip intervals. According to another aspect, interference is cancelled using a technique that estimates bits for a symbol by interpolating signature waveforms for users to a common sampling lattice of the received data. According to another aspect, multi-stage, hybrid multi-stage, and reconfigurable recursive multi-stage multi-user detection architectures and corresponding processes are provided.
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A system for canceling multiple user interference in a communications system wherein a plurality of users communicate over a shared channel, the system comprising:
- a configurable multi-user detection (MUD) module comprising:
- an input for receiving a plurality of discrete values;
- a gain factor module that is configurable to select a gain factor corresponding to a desired multi-user detection algorithm;
- and
- a function module that is configurable to select a non-linear function corresponding to the desired multi-user detection algorithm.
A method for providing configurable multi-user detection in a communications system wherein a plurality of users communicate over a shared channel, the method comprising:
- configuring a gain factor module to select a gain factor corresponding to a desired multi-user detection algorithm;
- configuring a function module to select a non-linear function corresponding to the desired multi-user detection algorithm.
- receiving a set of data that provides a plurality of discrete values and canceling multi-user interference according to the desired multi-user detection algorithm.
Dependencies are inferred from the claim text.