# Tagged Questions

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### Audio - TDOA and $\tt xcorr$, find the 'best' peak

I try to locate a mobile device using multilateration. The mobile device acts as the receiver and in the room I have three speakers. To calculate the position I need the time difference of arrival (...
66 views

### Signal enhancing algorithm (deconvolution??)

I need an algorithm (preferably Pascal-like, but anything else will do it also) that will make the "signal" (actually a series of data points) in left look like the one in right. Signal origin: ...
55 views

### Detection of low frequency signal

I have a strong primary signal with frequency range between 100–200 kHz. This signal has very low frequency and lower SNR secondary signal phase modulated to it. The modulated signal is around 10-30 ...
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### What is the time it takes to measure the SINR in LTE?

I would like to know how much time it takes the receiver to evaluate the SINR? Scenario: Assume that a base station (eNodeB) would like to transmit to one user. Let us say that it sends a pilot ...
48 views

### Can we detect multiple point target within a narrow-band transmit signal?

As I understand matched filter is optimal linear filter for maximizing the Signal to noise ratio (SNR) in presence of additive stochastic noise. Consider a radar/sonar system with narrow-band transmit ...
38 views

### Methods for calculating signal quality metric

i'm sure this is a fairly large topic area, but I'm not quite sure where to start. I have a signal in which I can change several parameters, such as the frequency, gain, etc. The modulation is a ...
27 views

### How do I correctly receive a signal using a signal analyzer?

For the past few weeks, I have been trying to send a Zaddof Chu signal using a vector signal generator, and receive it using a signal analyzer. Both devices are made by R&S. However, the signal ...
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### what is the differences between thin structures and edges in image

I want to know what are the differences between the thin structures (filaments, point, segments) and edges of image. How to detect the fine structure. why the Bi-Laplace operator can detect the ...
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### Get keypad codes using the fact that every number has a different pitch

I wanted to do a small weekend project not from my area of work. I think it'd be interesting to write an app which would take in audio recording of people using a keypad and write out list of codes ...
43 views

### Heterodyne detection

Prove that with appropriate choices of the phase $\varphi$, one can recover the quadratures of $m(t).$ Attempt The context of this question is weak optical signals combined with a strong local ...
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### processing photo diode array data

We have designed a system which has an 8X8 array of photo diodes, we sense 10ns pulses of laser falling on those photo diodes with a repetetion rate of maximum 50Khz i.e. 20us, we were successfully ...
42 views

### Maximum Likelihood for colored noise

I have the following question about the maximum likelihood (ML) in presence of inter-symbol interference and colored noise. Assume the communication system is as follows. Information source, ...
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### Maximum Likelihood question

I have a basic question about maximum likelihood (ML) estimator and its implementation. I am trying to simulate a communication system affected by ISI and noise, while using ML at the receiver side ...
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### How to interpret output of matched filter with complex input?

I have implemented a matched filter based on the Fourier Transform approach. In the real numbers domain that means that I use as the coefficients of my filter (B) the inverted time-samples of the ...
61 views

### detection of similar segments of two signal

I have two signals, the first is a reference signal from which I selected a segment. I'm trying to find which segment of the other signal is the most similar to this selected segment. I'd be glad ...
36 views

### Why Fourier transform and Stockwell-transform retain the absolute phase information of one signal?

Hello friends am studying the topic of signal processing and the Fourier transform and the s-transform and in most books as for example "Time-Frequency Signal Analysis and Processing. 2nd" of Boashash ...
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### MUSIC algorithm with incoherent sources

From what I gather, the MUSIC algorithm, when used for direction of arrival estimates, requires a narrowband signal so that the wavefront impinging on the receiver array differs essentially only in ...
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### suppose if we send AM modulated message signal through space how the receiver will be knowing that we applied AM modulation?

suppose if we send AM modulated message signal through space how the receiver will be knowing that we applied AM modulation basically how it will be knowing that which modulation is applied for our ...
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### Decoding of binary signal from a temperature sensor [closed]

I have the following signal from a temperature sensor (broadcasts on 433.92 MHz, apparently as ASK). I cannot for the life of me extract the temperature data. I've tried reading off the bits in so ...
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### What are the alternatives to FFT for computing high-resolution tone power levels?

I have a system where there's a transceiver which transmits tones on specific frequencies (about 260kHz) and a receiver which is supposed to recognize those tones. The transmitted tones are of low ...
210 views

### Detecting FSK near real time with c#

I try to detect some FSK signals made by audio in near real time. I know that I will get some latency. In the start I try to detect some tones of 10Khz in a duration of 75ms. That is achieved by a ...
154 views

### Signal reconstruction in FMCW radar

I am doing fmcw radar simulation. I have an output of mixer and from that I want to reconstruct the amplitude and phase of the signal. Therefore, I am taking hilbert transform and by the ...