Device and method for estimating delay, frequency and phase of passive intermodulation signal

A technology of phase estimation and passive intermodulation, applied in multi-frequency code systems, modulated carrier systems, digital transmission systems, etc., can solve problems such as estimation method research

Inactive Publication Date: 2016-02-03
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the passive intermodulation signal in the actual communication system is

Method used

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  • Device and method for estimating delay, frequency and phase of passive intermodulation signal
  • Device and method for estimating delay, frequency and phase of passive intermodulation signal
  • Device and method for estimating delay, frequency and phase of passive intermodulation signal

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Embodiment 1

[0056] This embodiment describes the principle of a passive intermodulation signal time delay, frequency and phase estimation device and method of the present invention.

[0057] figure 1 It is a structural schematic diagram of a passive intermodulation signal time delay, frequency and phase estimation device in the present invention and embodiments, figure 2 It is a flow chart of the implementation of the passive intermodulation signal time delay, frequency and phase estimation method in the present invention and the embodiment. This embodiment provides the time delay, frequency offset and phase estimation method of the present invention in actual implementation, from figure 2 It can be seen that the specific steps of a passive intermodulation signal time delay, frequency and phase estimation method in this embodiment are as follows:

[0058] 1) Carry out quadrature down-conversion, low-pass filtering and sampling on the dual-carrier modulation signal respectively to obta...

Embodiment 2

[0066] The dual-carrier modulation signal S in a passive intermodulation signal time delay, frequency and phase estimation device in this embodiment 1 (t) and S 2 The center frequency or carrier frequency of (t) is ω 1 =2πf 1 and ω 2 =2πf 2 , where f 1 =2.17GHz, f 2 =2.2GHz, the signal bandwidth is 1MHz, and the frequency band of the receiving end is [2.04GHz, 2.06GHz];

[0067] The center frequency ω of the 9th-order PIM signal calculated in step 2 c =2πf c , f c =2.05GHz, by comparing and judging with the size of the receiving end frequency band range boundary 2.04GHz and 2.06GHz, it can be seen that it has fallen into the receiving frequency band, and: ω c =5ω 1 -4ω 2 , p=5, q=-4.

[0068] According to the formula (1) in the step of specification sheet of the present invention, namely:

[0069] P i m ( t , ω c ) = ...

Embodiment 3

[0089] This embodiment simulates a passive intermodulation signal time delay, frequency and phase estimation method of the present invention, and R 2 (m-τ,Δf) for time-frequency two-dimensional search, the simulation results are as follows image 3 shown. Among them, the x-axis is the frequency range for searching, the y-axis is the number of delayed sampling points, and the z-axis is the calculated R 2 (m-τ, Δf) value. The frequency offset search range is ±0.8MHz, and the search step is 80kHz. The frequency offset is set to 160kHz, and the value range of the relevant sampling point number k calculated in the formula (3) is [1, 20480]. It can be seen that R 2 The value of (m-τ, Δf) has a large peak only when the frequency and time delay match the received PIM signal, which proves the practicability of the algorithm. The simulation is carried out under the condition that the signal-to-noise ratio is 0dB, that is, the PIM signal and the noise power are equal. Depend on i...

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Abstract

The invention discloses a device and a method for estimating delay, frequency and phase of a passive intermodulation signal, belonging to the technical field of signal processing of wireless communication, satellite communication and ground communication systems. According to the method, orthogonality down-conversion, low pass filtering and sampling are separately performed on a dual carrier modulating signal so as to obtain corresponding baseband signals; then, a passive intermodulation (PIM) center frequency falling into a reception band is computed, and orthogonality down-conversion and sampling are performed according to the PIM center frequency so as to obtain corresponding baseband signals; an n-order PIM baseband signal with the center frequency of Omega c is computed; operation is performed on the obtained baseband signals and the PIM baseband signal so as to obtain four paths of correlation values; squaring and summing are performed on the four paths of correlation values, and a peak position is searched by use of two dimensions of delay and frequency so as to obtain delay and frequency offset; and after the delay and frequency offset are compensated, correlation values are recomputed, and finally, the phase is computed. The method is simple, has low complexity and good real-time performance, and can realize good estimation performance under high noise condition.

Description

technical field [0001] The invention relates to a device and method for estimating time delay, frequency and phase of passive intermodulation signals, belonging to the technical field of signal processing of wireless communication, satellite communication and ground communication systems, and in particular to the technical field of full-duplex communication systems. Background technique [0002] Passive Intermodulation (PIM for short) refers to the generation of signals containing two or more frequency components through passive devices (such as duplexers, isolators, coaxial cables, connectors, antennas, loads, etc.) A phenomenon in which new frequency components other than harmonics are present. Although linearity is a basic characteristic exhibited by passive devices, research and experiments have shown that passive devices also have weak nonlinearities, especially at high power. The passive intermodulation phenomenon was discovered as early as the 1970s, and it exists wi...

Claims

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Application Information

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IPC IPC(8): H04L27/38H04L27/26
CPCH04L27/3854H04L27/2695
Inventor 田露胡天存崔万照安建平卜祥元张序琦刘建纯
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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