Adaptive filtering circuit capable of reducing operation amount

Abstract

The invention discloses an adaptive filtering circuit capable of reducing the operation amount. An embodiment of the adaptive filtering circuit comprises a plurality of operation groups, a plurality of operational circuits, a summing circuit, a data amplitude limiting circuit, a parameter updating circuit and a control circuit. Each operation group corresponds to one balanced parameter and comprises a plurality of storage units. When the balanced parameter corresponding to each operation group is larger than the preset value, the control circuit leads each operational circuit to be matched with the operation group for operating to generate the output value of the operation group. The summing circuit sums the output values of all the operation groups to generate filtering output values. The data amplitude limiting circuit generates corresponding amplitude limiting values according to the filtering output values. The parameter updating circuit updates and monitors balanced parameters according to the filtering output values and the amplitude limiting values.

Description

technical field [0001] The invention relates to an adaptive filter circuit, in particular to an adaptive filter circuit which can reduce the calculation amount. Background technique [0002] In the receiving circuit of many communication devices, an adaptive filter circuit (adaptive filter) is often used to equalize (equalize) the interference caused by various channel effects on the signal, so that the communication device can restore the information sent by the signal sending end. In some system applications, a very long adaptive filter circuit is required to effectively equalize the influence of channel effects, for example, the receiving circuit used to receive digital TV signals formulated by the Advanced Television Standards Committee (ATSC), It is often necessary to use an adaptive filter circuit with hundreds to thousands of taps (tap, node). [0003] However, when the length of the adaptive filter circuit increases (or the number of taps increases), it is not only ...

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Problems solved by technology

[0003] However, when the length of the adaptive filter circuit increases (or the number of taps increases), it is not only necessary to increase the memory, but also to increase the calculation circuit required to generate the output value of the filter circuit and update the equalization parameters of the filter circuit, so that the area of ​​the receiving circuit and The amount of calculation is greatly increased, and it will consume a lot of energy, which will increase the demand for heat dissipation

Therefore, when using such a long-length adaptive filter circuit, the above-mentioned problems will increase the difficulty of system design and system integration.

[0004] On the other hand, if the length of the adaptive filter circuit is simply shortened in order to reduce the area and calculation load of the receiving circuit, it will not only reduce the demodulation performance of the receiving circuit, but also cause large changes in the channel. It will cause the demodulation failure of the receiving circuit, which will cause troubles in use

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