Source: http://www.google.com/patents/US7817532?dq=7,379,981
Timestamp: 2017-11-25 08:11:19
Document Index: 39217953

Matched Legal Cases: ['Application No. 2006', 'Application No. 2006', 'Application No. 08007677', 'Application No. 2006', 'Application No. 2006', 'Application No. 1999', 'Application No. 2293239', 'Application No. 98926433', 'Application No. 2293239']

Patent US7817532 - Adaptive allocation for variable bandwidth multicarrier communication - Google Patents
Data is distributed among the channels of an asynchronous data subscriber loop (ADSL) communications system in accordance with an adaptive algorithm which from time to time measures the signal to noise ratio of the various channels and finds a margin for each channel dependent on achievement (where possible)...http://www.google.com/patents/US7817532?utm_source=gb-gplus-sharePatent US7817532 - Adaptive allocation for variable bandwidth multicarrier communication
Publication number US7817532 B2
Application number US 11/422,810
Also published as US6798735, US8369275, US8767698, US20050083972, US20060209894, US20110019751, US20130155870
Publication number 11422810, 422810, US 7817532 B2, US 7817532B2, US-B2-7817532, US7817532 B2, US7817532B2
Inventors Marcos Tzannes, George Kechriotis, Pui Wu
Original Assignee Marcos Tzannes, George Kechriotis, Pui Wu
Patent Citations (55), Non-Patent Citations (38), Referenced by (3), Classifications (6), Legal Events (4)
Adaptive allocation for variable bandwidth multicarrier communication
US 7817532 B2
N max = ∑ j = 1 J c j ,
where the respective cj are determined from the measured signal to noise ratios, SNRj. See, for example, “Digital Communications” by John G. Proakis, pp. 278ff for channel capacity calculations for quadrature amplitude modulation (QAM) systems, the preferred form of transmission for this invention. Preferably, the channel capacity calculations are performed in advance and stored in the form of lookup tables for rapid access. In the preferred embodiment described herein, the margin M is determined as M=(10/J)*(Nmax−N). The augmented constellation signal to noise ratio is then given by SNRa[cj]=SNR[cj]+M, and this value is used to determine (e.g., by table lookup as described above) the number of bits that can be transmitted over a channel. By augmenting the constellation signal to noise ratio, SNR[cj], rather than the channel signal to noise ratio, SNRj, fewer additions are required, since the range of constellation sizes (e.g., cj=1 . . . 15) is typically smaller than the range of channels (e.g., j=1 . . . 256).
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JP2000514991A Title not available
WO2098/52312A3 Title not available
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U.S. Classification 370/207
International Classification H04L27/26, H04J11/00
Cooperative Classification H04W72/04, H04L27/2608
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TZANNES, MARCOS C.;KECHRIOTIS, GEORGE;WU, PUI;REEL/FRAME:026840/0577