Joint symbol, amplitude, and rate estimator
AssigneeBAE Systems Information and Electronic Systems Integration Inc.
InventorThomas P. McElwain
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Abstract
The system in one embodiment relates to tightly integrating parameter estimation, symbol hypothesis testing, decoding, and rate identification. The present invention provides Turbo-decoding for joint signal demodulation based on an iterative decoding solution that exploits error correction codes. The system iteratively couples an initial amplitude estimator, a symbol estimator, a bank of decoders, and a joint amplitude estimator to produce the symbol estimates.
Claims8
A joint amplitude estimator for a data stream from multiple users, comprising:
- a data stream from said multiple users divided into a plurality of observation intervals;
- a plurality of processing modules coupled to said observation intervals, wherein said processing modules calculates interference cancellation values for each of said users and computes a filter for each of said observation intervals, said filter being applied to said data within said observation interval to compute individual amplitude estimates;
- and
- an amplitude estimation unit which processes said individual amplitude estimates and calculates new amplitude estimates, wherein said new amplitude estimates are iteratively passed back to said processing modules until a final condition is obtained.
A method for processing amplitude estimates for a multiuser data stream divided into a plurality of observation intervals, comprising:
- computing a filter for each said observation interval of said data stream;
- applying interference cancellation to said data stream for each said observation interval;
- applying said filter to said data stream for each said observation interval from said interference cancellation to produce individual amplitude estimates for each said observation interval;
- computing new amplitude estimates using said individual amplitude estimates;
- and
- passing said new amplitude estimates back to said filter for iterative processing until a final condition is obtained.
Dependencies are inferred from the claim text.