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Multi-frequency programmable matching filter

A matched filter and frequency technology, which is applied in the field of multi-frequency programmable matched filters, can solve the problems of the unadjustable filtering order of the matched filter and the inability to change the filter frequency, and achieves great application value and small signal-to-noise ratio loss. , the effect of saving resource consumption

Active Publication Date: 2013-10-02
北京中宸微电子有限公司
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Problems solved by technology

[0004] In order to solve the above problems, the present invention proposes a multi-frequency programmable matched filter, the purpose of which is to solve the problem that the filtering order of the matched filter cannot be adjusted, and the filter frequency cannot be changed according to the change of the input carrier frequency

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Embodiment 1

[0015] Such as figure 1 is a structural diagram of a first-order matched filter, including local generator 1, local generator 0, matched filter FL1, and matched filter FL0. The matched filter FL1 corresponds to the matching of the lower limit frequency of the carrier signal, and FL0 corresponds to the matching of the upper limit frequency of the carrier signal. The carrier signal is input to the input end of the matched filter after analog-to-digital conversion, where "1" corresponds to the lower limit frequency f1 of the carrier, and the symbol "0" corresponds to the upper limit frequency f0 of the carrier. The frequency of local generator 1 and local generator 0 can be dynamically adjusted in real time by software control. Therefore, the frequency of the two matched filters in each group can also be changed in real time. When the frequency of the input carrier signal changes, the frequency of the impulse response signal of the matched filter also changes, so the carrier sig...

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Abstract

A multi-frequency programmable matching filter belongs to the field of digital signal spread spectrum communication. Every order of matching filters are composed of two matching filters, wherein the frequency of one matching filter is corresponding to an upper limit frequency of carrier signals, and the other matching filer is corresponding to a lower limit frequency of carrier signals. Frequencies of the two matching filters in every order vary according to the frequencies of input carrier signals, and at the same time, filter orders of the multi-frequency programmable matching filter are adjustable. Difference comparison between the data output by the matching filter and a local carrier template is conducted, and if an output signal is smaller than the difference of the local carrier template, the programmable matching filter outputs the output signal to a next-order matching filter for filtering until the output carrier signal being larger than the value of the local carrier template. Since multi-order filtering is performed on the carrier signals, useful components of the output carrier signals are enhanced as much as possible and a signal to noise ratio is increased.

Description

technical field [0001] The invention relates to a multi-frequency programmable matching filter, which belongs to the technical field of electric power carrier, and specifically belongs to the technical field of digital signal processing. Background technique [0002] A basic concept in communication is modulation, which refers to using a modulated signal carrying useful information to control a high-frequency carrier signal. Digital frequency modulation, also known as frequency shift keying, uses different carriers to transmit digital signals. FM signal, namely 2FSK signal, is an earlier communication method used in digital communication systems. This communication method is easy to implement, has strong anti-noise and anti-attenuation performance, and is widely used in low-speed data transmission communication systems. [0003] In the power line communication system, when the carrier signal is transmitted, due to the change of the input impedance of the power line and the ...

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Application Information

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IPC IPC(8): H04B3/54H04B1/707
Inventor 李桂林李全在常永利张雪琳
Owner 北京中宸微电子有限公司
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