Parallel high-order adaptive notch filter and adaptive notch method based on tdm

An adaptive notch filter and adaptive notch technology, applied in the field of communication, can solve the problems of low implementation complexity, poor notch effect and stability, and high implementation complexity, so as to reduce the amount of calculation and reduce the complexity of implementation. Degree, notch effect is good

Inactive Publication Date: 2011-12-21
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to overcome the problems of high complexity, poor notch effect and stability, and merging of multiple zero trap points in the existing parallel structure trap, and provide a trap with low complexity and high trap effect. It has good stability and can reduce or avoid the phenomenon of unreasonable combination of null traps, so that the number of null traps is approximately the same as the number of actual narrow-band strong interference. TDM-based parallel structure high-order adaptive notch filter and adaptive notch method

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  • Parallel high-order adaptive notch filter and adaptive notch method based on tdm
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  • Parallel high-order adaptive notch filter and adaptive notch method based on tdm

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Embodiment 1

[0046] refer to figure 1 , the present invention is a high-order adaptive notch filter based on TDM parallel structure, including serial-to-parallel conversion time-division splitter, parallel-serial conversion time-division multiplexer, and N-order Adaptive notch filter; the received signal x(k) of a communication receiver is input to the N-order adaptive notch filter in parallel at the same time, and after the narrow-band strong interference in the signal is filtered by the adaptive notch filter, it is combined into one channel The signal y(k) is output. The serial-to-parallel conversion time-division splitter of the present invention is a splitter that adopts sample point interleaving TDM technology to perform branching, and the parallel-to-serial conversion time-division multiplexer is a multiplexer that uses TDM technology to perform multiplexing, and the received signal x(k) It is an intermediate frequency analysis signal, including a zero intermediate frequency analysi...

Embodiment 2

[0067] The TDM-based parallel structure high-order adaptive notch filter and the TDM-based parallel structure high-order adaptive notch method of the present invention are the same as those in Embodiment 1.

[0068] Now assume again that x(k) is a broadband zero-IF complex signal with a sampling rate of B samples / second and a signal bandwidth of B x Satisfy B x J Hz, and B J x . Above-mentioned broadband zero intermediate frequency complex signal x (k) adopts the notch process of parallel structure adaptive notch filter of the present invention to comprise the following steps:

[0069] Step 1: adopting the method of sampling point interleaving and time-division splitting, divide x(k) into N paths; each path signal is equivalent to carrying out N: 1 down-sampling extraction, and the sampling rate is reduced to 1 / N of the original sampling rate, see figure 1 . According to the theorem proved above, as long as MB J / N>B J , the narrowband signal in each branch signal will ...

Embodiment 3

[0077] The TDM-based parallel structure high-order adaptive notch filter and the TDM-based parallel structure high-order adaptive notch method of the present invention are the same as the embodiments 1-2.

[0078] The present invention requires the input signal to be an analysis signal. For the two signals obtained by quadrature down-conversion, one path is used as the real part and the other path is used as the imaginary part to form the analysis signal. If the input signal is not a zero-IF signal, but a real signal with a higher intermediate frequency, then as long as the signal is phase-shifted by 90 degrees, its Hilbert transform is obtained as the imaginary part, and the original signal is used as the real part to form an analytic signal; but at this time, it should be noted that the frequency range of the signal does not occupy the entire frequency range of [-π, +π], but only a part of it.

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Abstract

The invention discloses a TDM (Time Division Multiplexing)-based high-order adaptive wave trap of a parallel structure and an adaptive wave trap method, and belongs to communication technology. The method comprises the following steps of: dividing a high-speed sampling point sequence into N (N is greater than or equal to 2 and is less than or equal to 9) low-speed sampling point sequence branchesbased on a narrow band analytic signal sampling theorem by using a sampling point interleaving TDM technology; performing cascaded high-order adaptive wave trap respectively; and combining by using the TDM technology to reduce the low-speed sampling point sequence branches into a high-speed sequence, wherein the entire wave trap falls to be zero close to a specific frequency omega i; and omega i is amended in a unified way by using a linkage method to realize adaptive iteration. Through the wave trap serving as preprocessing before de-spreading, a plurality of narrow band strong interferencescan be suppressed, and the interference tolerance of the system can be greatly improved. High-order adaptive wave trap can be realized at the sampling rate of over hundreds of megabits, the realization complexity is low, the wave trap effect and the stability are high, a plurality of zero fall combination phenomena can be reduced or avoided, and the number of zero fall frequency points is approximately the same as the number of the actual narrow band strong interferences. The wave trap and the wave trap method are mainly used in wideband or ultra wideband digital communication systems.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to narrow-band interference suppression in receivers, specifically a high-order adaptive notch filter and adaptive notch method based on time division multiplexing (abbreviated as TDM) in parallel structure, which is applied to digital communication Narrowband interference in the system, especially for the preprocessing of the receiver before despreading in the direct sequence spread spectrum communication system. Background technique [0002] For a broadband wireless communication system, when the frequency band being interfered is much narrower than the communication signal frequency band (for example, 1 / 10), the interference can be regarded as narrow-band interference. For such narrow-band interference, various prediction methods can be used to estimate the correlation between samples, and then subtract the estimated interference from the received signal to achieve the purpos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/71H04B1/7163H04J3/00H04B1/10
Inventor 易克初王勇超熊海良彭萍
Owner XIDIAN UNIV
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