# Questions tagged [frequency-modulation]

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### Wideband FM generation problem

What I found out: The order of the multiplier would be $n=5$. The two LO frequencies can be 90 MHz and 80 MHz. The bandwidth is given by $BW = 2(B_f+1)W$ Where W is the modulation bandwidth given ...
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### Pre-envelope of an FM signal $s(t) = A\cos[\omega_ct + B\sin(\omega_xt)]$ [duplicate]

I want to ask a question about pre-envelope of an FM wave: $$s(t) = A\cos[\omega_ct + B\sin(\omega_xt)]$$ Can someone explain briefly how we calculate the pre-envelope of this signal?
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### Instantaneous frequency, PLLs, frequency mixing, cross-correlation and the cross-correlation matrix

This is as much a request for comment and critique as anything else. I am looking at tracking how a system perturbs an input that is a (real) sinoid of varying frequency. ...
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### RF Downconversion using Heterodyne Principle

after a RF down-conversion using heterodyning principle, will there be an information loss? If we translate to a fixed IF frequency, is there is an intuitive way of explain that the information can be ...
20 views

### How to demodulate PM modulation

I'm using a sin wave $s_{sc}(t) = d(t)\cos(\omega_{sc}t + \varphi_{sc})$ to modulate a carrier using phase modulation. I'm working on Matlab so I use the pmmod function to do so. It is not too ...
78 views

I have an SDR receiver I'm interested in making into a FMCW radar. The bandwidth is somewhat narrow as it only samples at 64 MSPS. There is a problem in that without a bunch of embedded programming ...
16 views

### Representing the signal $u(t)=A_c \cos (2 \pi f_c t + \beta \cos 2 \pi f_m t)$ in terms of Bessel function

I want to represent the signal $u(t)=A_c \cos (2 \pi f_c t + \beta \cos 2 \pi f_m t)$ in terms of Bessel function. I have done the exercise. I want someone to check whether what I have done is ...