A passive intermodulation signal time delay, frequency and phase estimation device and method
A technology of phase estimation and passive intermodulation, applied in multi-frequency code systems, multi-carrier systems, etc., can solve problems such as estimation method research
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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] and formula (2)
[0070]
[0071] Calculate the components of the sum, the specific process is:
[0072] First, calculate the component information of PIM acco...
Embodiment 3
[0088] 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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