| US 7,463,703 B2 | ||
| Joint symbol, amplitude, and rate estimator | ||
| Thomas P McElwain, Merrimack, N.H. (US) | ||
| Assigned to Bae Systems Information And Electronic Systems Integration Inc, Nashua, N.H. (US) | ||
| Appl. No. 10/531,772 PCT Filed Nov. 25, 2003, PCT No. PCT/US03/38190 § 371(c)(1), (2), (4) Date Apr. 19, 2005, PCT Pub. No. WO2004/095713, PCT Pub. Date Nov. 04, 2004. |
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| Claims priority of provisional application 60/462657, filed on Apr. 14, 2003. | ||
| Prior Publication US 2006/0047842 A1, Mar. 02, 2006 | ||
| Int. Cl. H04L 27/06 (2006.01) | ||
| U.S. Cl. 375—341 [375/320] | 5 Claims |
| 1. An apparatus for processing a digital data stream from multiple users, comprising:
an initial amplitude estimation unit processing said data stream and producing initial amplitude estimates on a first iteration;
a joint amplitude estimator coupled to said data stream and said initial amplitude estimator, wherein said joint amplitude
estimator produces updated amplitude estimates;
a symbol estimator coupled to said data stream, said initial amplitude estimator, and said joint amplitude estimator, wherein
said symbol estimator produces a plurality of symbols estimates for each user; and
a bank of decoders coupled to said symbol estimator, producing a plurality of symbol likelihood estimates for each user, wherein
said symbol likelihood estimates are iteratively fed back to said symbol estimator and said joint amplitude estimator until
a final condition is obtained.
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