Einzeltreffer — DigiBib

Methods and apparatus are provided for receiving an input signal. In an embodiment of the invention a current candidate QAM constellation can be selected. A mean squared error of a signal responsive to the input signal can be computed based on the current candidate QAM constellation. The computed mean squared error can be compared to a threshold error value. The invention advantageously allows for relatively efficient and relatively reliable equalization of signals transmitted with an unknown QAM constellation, and allows for relatively efficient and reliable recovery of the unknown QAM constellation.

Titel:	CONSTELLATION RECOVERY FOR QUADRATURE AMPLITUDE MODULATION
Autor/in / Beteiligte Person:	Cheong, KoK-Wui
Link:	View record in USPTO Patent Applications (Volltext)
Veröffentlichung:	2010
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20100290565 Publication Date: November 18, 2010 Appl. No: 12/829750 Application Filed: July 02, 2010 Claim: 1-46. (canceled) Claim: 47. A method of receiving an input signal, the method comprising: selecting, by candidate selector circuitry, a current candidate quadrature amplitude modulation (QAM) constellation from a plurality of candidate QAM constellations with which the input signal is transmitted, wherein each QAM constellation comprises a plurality of points; computing, by error computing circuitry, an error for a signal responsive to the input signal based on the current candidate QAM constellation; and comparing, by error comparison circuitry, the error to a threshold error value. Claim: 48. The method of claim 47 further comprising: selecting a previous candidate QAM constellation from the plurality of candidate QAM constellations; and identifying the previous candidate QAM constellation as a recovered QAM constellation based on a result of the comparing. Claim: 49. The method of claim 48 wherein the identifying occurs if the computed error is substantially greater than the threshold error value. Claim: 50. The method of claim 48 wherein the selecting the current candidate QAM constellation comprises setting a candidate QAM constellation index to a number corresponding to the current candidate QAM constellation. Claim: 51. The method of claim 47 further comprising comparing a measured occurrence rate of the signal responsive to the input signal at a selected point in the current candidate QAM constellation to an occurrence threshold value. Claim: 52. The method of claim 51 wherein the comparing the measured occurrence rate to the occurrence threshold value occurs if the computed error is substantially less than the threshold error value. Claim: 53. The method of claim 51 further comprising setting a next threshold error value to be substantially equal to the computed error. Claim: 54. The method of claim 47 further comprising selecting a next candidate QAM constellation if the computed error is substantially less than the threshold error value. Claim: 55. The method of claim 47 further comprising setting the threshold error value to be substantially equal to infinity. Claim: 56. Circuitry for receiving an input signal, the circuitry comprising: candidate selector circuitry operable to select a current candidate QAM constellation from a plurality of candidate QAM constellations with which the input signal is transmitted, wherein each QAM constellation comprises a plurality of points; error computing circuitry responsive to the candidate selector circuitry and operable to compute an error of a signal responsive to the input signal based on the current candidate QAM constellation; and error comparison circuitry responsive to the error computing circuitry and operable to compare the computed error to a threshold error value. Claim: 57. The circuitry of claim 56 further comprising identification circuitry responsive to the error comparison circuitry and operable to identify a previous candidate QAM constellation from the plurality of candidate QAM constellations as a recovered QAM constellation based on a result of the error comparison circuitry, wherein the candidate selector circuitry is further operable to select the previous candidate QAM constellation. Claim: 58. The circuitry of claim 57 wherein the identification circuitry is operable to identify the previous candidate QAM constellation as the recovered QAM constellation if the computed error is substantially greater than the threshold error value. Claim: 59. The circuitry of claim 57 wherein the candidate selector circuitry is further operable to set a candidate QAM constellation index to a number corresponding to the current candidate QAM constellation. Claim: 60. The circuitry of claim 56 further comprising occurrence rate comparison circuitry responsive to the computed error comparison circuitry and operable to compare a measured occurrence rate of the signal responsive to the input signal at a selected point in the current candidate QAM constellation to an occurrence threshold value. Claim: 61. The circuitry of claim 60 wherein the occurrence rate comparison circuitry is operable to compare the measured occurrence rate to the occurrence threshold value if the computed error is substantially less than the threshold error value. Claim: 62. The circuitry of claim 60 further comprising threshold setting circuitry responsive to the occurrence rate comparison circuitry and operable to set a next threshold error value to be substantially equal to the computed error. Claim: 63. The circuitry of claim 56 wherein the candidate selector circuitry is responsive to the error comparison circuitry and is further operable to select a next candidate QAM constellation if the computed error is substantially less than the threshold error value. Claim: 64. The circuitry of claim 56 further comprising threshold setting circuitry operable to set the threshold error value to be substantially equal to infinity, wherein the error circuitry is further responsive to the threshold setting circuitry. Claim: 65. A media player comprising the circuitry of claim 56. Claim: 66. A phone comprising the circuitry of claim 56. Current U.S. Class: 375/320 Current International Class: 04

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CONSTELLATION RECOVERY FOR QUADRATURE AMPLITUDE MODULATION