Longitude
发表于 2025-3-23 12:37:43
Costas Loop for BPSK Using Phasor Rotator Circuit,CO (voltage-controlled oscillator) or DCO (digital-controlled oscillator) for frequency and phase tracking;the local oscillator is simply an ordinary fixed frequency oscillator. Frequency and phase tracking must therefore be achieved by other means. The fixed frequency oscillator generates simultane
Binge-Drinking
发表于 2025-3-23 15:52:09
Costas Loop for QPSK Using Phasor Rotator Circuit,CO (voltage-controlled oscillator) or DCO (digital-controlled oscillator) for frequency and phase tracking; the local oscillator is simply an ordinary fixed frequency oscillator. Frequency and phase tracking must therefore be achieved by other means. The fixed frequency oscillator generates simultan
freight
发表于 2025-3-23 21:41:03
Costas Loop for Quadrature Amplitude Modulation,ribed first. When the data signals (I and Q in this case) are unfiltered, the modulated QAM signal would occupy a large frequency range. To reduce bandwidth, the I and Q signals are usually filtered. It is shown that so-called Nyquist filters are the best choice, because they allow the receiver to d
知识
发表于 2025-3-24 01:55:20
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interpose
发表于 2025-3-24 04:33:57
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implore
发表于 2025-3-24 09:16:08
https://doi.org/10.1007/978-3-319-72008-1Phase-Locked Loops; Phaselock Techniques; Communication Receivers; Communication System Design; Software
BARB
发表于 2025-3-24 13:27:11
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眨眼
发表于 2025-3-24 16:25:10
Josef Broichhausen,Mahmud Telfaht used for the synchronous reception of amplitude modulated radio signals with carrier (c). If the modulation index is less than 100%, the modulated signal is always in phase with the carrier signal (c), irrespective of the polarity of the modulating signal. The PLL then reconstructs a local carrier
打谷工具
发表于 2025-3-24 21:51:53
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人充满活力
发表于 2025-3-25 00:36:58
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