Telecommunications transmission systems

Details Telecommunications transmission systems Telecommunications transmission systems

2006-07-18

2006-07-18

Tran, Khai (Department: 2637)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S346000, C375S229000, C375S232000, C370S208000, C370S203000

Reexamination Certificate

active

07079610

ABSTRACT:
In a multi-carrier system employing OFDM, for example DMT, an adaptive channel equalizer is normally used, operating in the frequency domain. The sampling clock is controlled so that the time delay between the transmitter and the receiver is effectively eliminated. If the information used to control the sampling clock is received from the equalized data stream, it will introduce an ambiguity between the operation of the channel equalizer and the mechanism used to control the sampling clock. Operation of the equalizer can mask an increasing time difference, between transmitter and receiver, which the sample clock controller should be tracking. The present invention eliminates the ambiguities in the operation of the equalizer and sample clock controller by preventing the equalizer from accepting time differences which should be corrected by operation of the sample clock controller.

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