| US 7,492,703 B2 | ||
| Noise analysis in a communication system | ||
| Itay Lusky, Hod Hasharon (Israel); Daniel Wajcer, Beit-Yehoshua (Israel); Yosef Bendel, Holon (Israel); Yigal Bitran, Tel Aviv (Israel); Naftali Sommer, Rishon Le Zion (Israel); Ofir Shalvi, Herzlia (Israel); Zvi Reznic, Tel-Aviv (Israel); Ariel Yagil, Ramat-Hasharon (Israel); Ran Senderovitz, Ramat Gan (Israel); and Eli Haim, Herzeliya (Israel) | ||
| Assigned to Texas Instruments Incorporated, Dallas, Tex. (US) | ||
| Filed on Oct. 18, 2002, as Appl. No. 10/273,561. | ||
| Claims priority of provisional application 60/360494, filed on Feb. 28, 2002. | ||
| Prior Publication US 2003/0185176 A1, Oct. 02, 2003 | ||
| Int. Cl. H04J 11/00 (2006.01) | ||
| U.S. Cl. 370—210 [370/252; 370/485] | 20 Claims |
| 10. A system for allocating a channel in a communication system, comprising:
a dedicated digital front end dedicated to upstream channel measurement and analysis, performance estimation and for receiving
samples of the input signals, wherein the dedicated digital front end further comprising a plurality of stages including a
plurality of decimating filters, at least one matched filter, down conversion and signal processing blocks and wherein the
dedicated digital front end provides for periodically scanning an upstream band and implementing a fast fourier transform
FFT algorithm on only a part of the upstream band to estimate noise in the upstream band;
a predictor coupled to the dedicated digital front end for predicting highly correlated ingress noise from a first sample
of an input signal received over a proposed channel during a time in which the proposed channel is carrying no active transmission;
and
a subtraction unit coupled to the predictor for subtracting the predictor output from a second sample of the input signal
received over the proposed channel, to determine residual noise;
analyzer circuitry for allocating the proposed channel responsive to the estimated noise in the upstream band and the residual
noise.
|