Patent · US Active

Method and system for a robust initialization symbol for digital duplexing

US7756217B2 · kind B2 · utility

2Cited by

7References

11Claims

0Family size

Assignee

Broadcom Corporation · US

Inventors

Miguel Peeters · Brussels, BE
Philippe Antoine · Walhain, BE
Geert Goris · Heverlee, BE

Key dates

Filing date	Dec 21, 2005
Grant date	Jul 13, 2010
Priority date	—
Expiry date	Jan 19, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH04L27/2607
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

Provided is a method and system for increasing cyclic prefix and cyclic suffix based upon a fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT). The method includes representing at least one of the one or more DMT symbols in frequency domain to produce a frequency domain representation. The frequency domain representation corresponds to a quadrature amplitude modulation (QAM) constellation. Next the QAM constellation is rotated in the frequency domain by changing a characteristic of the DMT symbol as a function of tone index (k), cyclic extension length (CE), inverse fast fourier transform (IFFT) size (N), and pi. Finally, a number of extended symbols are produced to represent the DMT symbol based upon the rotating.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.