Circuit device and method for compen sating interference in signal

Abstract

The circuit arrangement wherein the circuit arrangement includes at least one further multiplicity of first adder circuits which follow the multiplicity of first adder circuits the at least one further multiplicity of first adder circuits in each case being supplied with a further error signal vector and the at least one further multiplicity of first adder circuits adding the respective further error signal vector to the at least one signal vector in order to generate a progressively error-corrected signal vector. The circuit arrangement further includes at least one further multiplicity of first multiplier circuits which precede the at least one further multiplicity of first adder circuits and multiply the respective further error signal vector by adjustable coefficients.

Description

technical field [0001] The invention relates to a circuit arrangement for compensating disturbances in signals produced by discrete multitone modulation and to a method for compensating disturbances in signals produced by discrete multitone modulation. Background technique [0002] Discrete multitone modulation (DMT)—also known as multicarrier modulation—is a modulation method particularly suited for transmitting data over linearly distorted channels. In contrast to so-called single-carrier methods such as amplitude modulation, which have only one carrier frequency, multiple carrier frequencies are used in discrete multi-tone modulation. In this type of modulation, the signal consists of multiple sinusoidal signals, each independent signal has a carrier frequency, and is amplitude and phase modulated by quadrature amplitude modulation (QAM). This provides a plurality of quadrature amplitude modulated or QAM modulated signals. In this structure, each carrier frequency can t...

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Problems solved by technology

Thus, a disadvantage of the circuit arrangement shown in FIG. 5 is that, in systems with poor recovery capabilities, the recovery cannot be compensated with the required accuracy, so that the above-described method and the above-described circuit configuration can only be used to a limited extent in these cases

[0040] Another disadvantage of the circuit structure shown in Fig. 5 is that the channel of the reference signal vector, i.e. the reference channel, cannot be used for data transmission at all, since it is not compensated

Furthermore, wrong decisions caused by the reference channel can lead to a multiplication of errors in the considered FFT module

[0041] Another disadvantage of the circuit structure shown in Figure 5 is that the circuit is very complex

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