Source: http://www.google.com/patents/US7583728?dq=6,418,462
Timestamp: 2014-03-15 08:02:11
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Matched Legal Cases: ['Application No. 2502924', 'Application No. 2503532', 'Application No. 2515167', 'Application No. 2503530', 'Application No. 2487817', 'Application No. 2484313', 'Application No. 2442400', 'Application No. 2491259', 'Application No. 200410100591', 'Application No. 03757359', 'application No. 03794510', 'Application No. 04256234', 'Application No. 03742400', 'Application No. 03777694', 'Application No. 03742393', 'Application No. 03774848', 'Application No. 03777627', 'Application No. 03742393', 'Application No. 03774848', 'Application No. 027289894', 'Application No. 07075745', 'Application No. 2004', 'Application No. 20026115', 'art 1', 'Application No. 092129629']

Patent US7583728 - Equalizers for layered modulated and other signals - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA method and apparatus for equalizing digital data signals is disclosed. The method comprises the steps of demodulating and decoding an input signal having input data to produce a data output, remodulating the data output to produce a training sequence including an idealized input signal, wherein the...http://www.google.com/patents/US7583728?utm_source=gb-gplus-sharePatent US7583728 - Equalizers for layered modulated and other signalsAdvanced Patent SearchPublication numberUS7583728 B2Publication typeGrantApplication numberUS 11/656,662Publication dateSep 1, 2009Filing dateJan 22, 2007Priority dateOct 25, 2002Fee statusPaidAlso published asUS8208526, US20070116108, US20090175327Publication number11656662, 656662, US 7583728 B2, US 7583728B2, US-B2-7583728, US7583728 B2, US7583728B2InventorsErnest C. Chen, Tung-Sheng Lin, Weizheng Wang, William C. LindseyOriginal AssigneeThe Directv Group, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (111), Non-Patent Citations (81), Referenced by (3), Classifications (10), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetEqualizers for layered modulated and other signalsUS 7583728 B2Abstract A method and apparatus for equalizing digital data signals is disclosed. The method comprises the steps of demodulating and decoding an input signal having input data to produce a data output, remodulating the data output to produce a training sequence including an idealized input signal, wherein the training sequence is comprised of adjacent symbols in the input data, and generating equalizer parameters from the training sequence. The apparatus comprises a demodulator (for demodulating an input signal to produce a data output), a modulator communicatively coupled to the demodulator (for remodulating the data output to produce a training sequence including an idealized input signal wherein the training sequence is comprised of adjacent symbols in the input data), and a parameter generation module communicatively coupled to the modulator (for generating equalizer parameters from the training sequence).
s UL ⁡ ( t ) = f U ⁡ ( M U ⁢ ⁢ exp ⁡ ( jω U ⁢ t + θ U ) ⁢ ∑ m = - ∞ ∞ ⁢ S U ⁢ ⁢ m ⁢ p ⁡ ( t - m ⁢ ⁢ T ) ) + f L ⁡ ( M L ⁢ ⁢ exp ⁡ ( jω L ⁢ t + θ L ) ⁢ ∑ m = - ∞ ∞ ⁢ S L ⁢ ⁢ m ⁢ p ⁡ ( t - m ⁢ ⁢ T + Δ ⁢ ⁢ T m ) ) + n ⁡ ( t ) where, MU is the magnitude of the upper layer QPSK signal and ML is the magnitude of the lower layer QPSK signal and ML<<MU. The signal frequencies and phase for the upper and lower layer signals are respectively ωU, θU and ωL, θL, respectively. The symbol timing misalignment between the upper and lower layers is ΔTm. The expression p(t−mT) represents the time shifted version of the pulse shaping filter p(t) 430 employed in signal modulation. QPSK symbols SUm and SLm are elements of
s UL ′ ⁡ ( t ) = M U ⁢ ∑ m = - ∞ ∞ ⁢ S U ⁢ ⁢ m ⁢ p ⁡ ( t - m ⁢ ⁢ T ) + M L ⁢ ⁢ exp ⁢ { j ⁡ ( ω L - ω U ) ⁢ t + θ L - θ U } ⁢ ∑ m = - ∞ ∞ ⁢ S L ⁢ ⁢ m ⁢ p ⁡ ( t - m ⁢ ⁢ T + Δ ⁢ ⁢ T m ) Because of the magnitude difference between MU and ML, the upper layer decoder 1002 disregards the ML component of the s′UL(t).
s L ⁡ ( t ) = M L ⁢ ⁢ exp ⁢ { j ⁡ ( ω L - ω U ) ⁢ t + θ L - θ U } ⁢ ∑ m = - ∞ ∞ ⁢ S L ⁢ ⁢ m ⁢ p ⁡ ( t - m ⁢ ⁢ T + Δ ⁢ ⁢ T m ) Any distortion effects, such as TWTA nonlinearity effects are estimated for signal subtraction. In a typical embodiment of the present invention, the upper and lower layer frequencies are substantially equal. Significant improvements in system efficiency can be obtained by using a frequency offset between layers.
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Chen, Non-final Communication dated Nov. 15, 2007.81Wolcott, Ted J. et al.; "Uplink-Noise Limited Satellite Channels"; IEEE 1995; pp. 717-721; XP-00580915.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8131791 *Apr 22, 2008Mar 6, 2012Texas Instruments IncorporatedDecision feedback equalizer having parallel processing architectureUS8223623 *Jun 9, 2006Jul 17, 2012Qualcomm IncorporatedTiming and frequency acquisition for OFDM systemsUS20090265406 *Apr 22, 2008Oct 22, 2009Patrick BosshartDecision feedback equalizer having parallel processing architecture* Cited by examinerClassifications U.S. Classification375/229, 375/233International ClassificationH03H7/30Cooperative ClassificationH04L25/03019, H04L2025/0342, H04L27/3488, H04L2025/03401, H04L2025/0349European ClassificationH04L25/03B1A, H04L27/34MLegal EventsDateCodeEventDescriptionMar 1, 2013FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google