Peak suppressing method and data transmission device

Abstract

A peak suppression method detects a peak value exceeding a threshold value of a transmitting signal, forms a peak value prediction signal which is limited to a noise cancelling frequency band of a receiving end, based on the detected peak value of the transmitting signal, and subtracts the peak value prediction signal from the transmitting signal.

Description

technical field [0001] The present invention relates to a peak suppression method and a data transmission device, in particular to a peak suppression method for suppressing transmission power peaks in a system for transmitting data at high speed with multiple carriers to avoid S / N deterioration at the receiving end, and a method for suppressing transmission signals during data transmission peak suppressed data transfer device. [0002] The multi-carrier data transmission here involves the wired ADSL (Asymmetric Digital Subscriber Line) and SDSL (Symmetrical Data Subscriber Line) fields, or the wireless OFDM field, the optical signal WDM field, and the like. Background technique [0003] The priority document of this application is Japanese Invention Patent Application No. 2001-186273 filed with the Japan Patent Office on June 20, 2001, and reference is made to the contents thereof. [0004] In systems that transmit data through wired, wireless or even optical transmission l...

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Problems solved by technology

[0019] Although, reducing the transmission level can prevent saturation at the peak point, but after all, the reception level must also be reduced, so that the S / N is significantly deteriorated

take Figure 4 As shown in the structure, even if zero insertion is used to eliminate noise, S / N will still be negative, and high-speed data transmission cannot continue.

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