Improved method for adapting the receiver demodulation...

Details Improved method for adapting the receiver demodulation... Improved method for adapting the receiver demodulation...

H - Electricity

04

L

H04L 27/34 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2337737

For several reasons some current G.992.1 and G.992.2 modems implement the transmitter (either the U/S or the D/S) with an IFFT size greater than the one specified by the Standard. If the images of the transmit signal are correctly replicated with period equal to the clock frequency of the Standard IFFTs (276 kHz for U/S and 2208 kHz for D/S), no difference is of course observed as the in this case the transmit signal is exactly the same as the one generated by a Standard-size IFFT. However, this does not occur in some of the G.992.x modems. Even though this does not compromise interoperability, if the receiver is not made aware of the way the transmit signal is generated inter-performance may be affected, particularly on short loops.

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