Questions tagged [performance]
The performance tag has no usage guidance.
15
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pairwise error probability and union bound of space time code
i have a question that might seem silly.
For a given space time code, say a constellation of 16 unitary matrices. When using the union bound to derive an upper bound on the average error probability (...
0
votes
1answer
22 views
BER performance of a space-time code over Rayleigh channel model
For a given space-time code, and in general terms, how would one proceed in the evaluation of the BER performance of this code ?
In order to be more clear, say i have 16 code matrices(who's elements ...
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2answers
60 views
Predicting Execution Time of DSP programs
I've been tasked with predicting the performance of our DSP code, for the obvious reasons (reduce time to market, add certainty in choosing chips, etc.)
Consider a system composed of many subsystems ...
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0answers
40 views
Signal acquisition equipment phase noise
I would like to check if there is a way to enhance an RF equipment's phase noise figure.
The considered RF acquisition homodyne system includes a mixer for carrier demodulation, amplifier and filter ...
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1answer
71 views
Highest rate achievable by current DSP and A/D chips?
I'm trying to determine whether an application I have in mind is feasible with currently available DSP technology (DSP chips and ADCs).
I want to eliminate an interfering signal using an LMS adaptive ...
2
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0answers
362 views
Fast implementation of LOESS for equally spaced samples (possibly using convolution)
Is it possible to do LOESS smoothing on equally spaced data using convolution?
The Wikipedia article on LOESS mentions a possibility of using a FIR filter for LOESS. I could not find anything more ...
0
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1answer
89 views
Comparing the control performance of a given closed loop system
I am having a question about comparing the control performance of a given closed loop. In this link there are some characteristic values that need to be calculated, but there is no description of what ...
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votes
1answer
684 views
Fast Integer 8 Hz 2nd Order LP for Microcontroller
I need an 8 Hz 2nd order LP filter. It does not have to be terribly accurate but it should be 2nd order-ish. Performance is much more important.
My sample rate at the moment is ~9.5 kHz. The filter ...
2
votes
1answer
839 views
Is a negative Es/No for an SCPC RF signal possible, and what would such a value signify?
I apologize if this isn't the correct Stack on which to ask this question, but it seemed like the best fit. I've tried to Google an answer, but I haven't been able to find anything that applies ...
2
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1answer
371 views
Performance metrics for analysing the performance of various filters
We are working with speckle noise reduction in ultrasound images by using various despeckling filtering techniques. We compare the performance of each filtering technique by using Quality metrics such ...
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3answers
386 views
inverse FFT when only a few time points are needed
I am developing C++ code to do some modeling that will take as input a parametric model of the complex frequency response (amplitude, phase) and produce as output an impulse response, e.g. using the ...
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3answers
479 views
What is the most computationally efficient way to generate 100 sine waves layered on top of each other?
Right now I simply do this (pseudocode)
for freq in freqs:
for i in len(samples):
samples[i] += sin(...)
Is there a better way? This is for ...
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0answers
196 views
Digital control: Exercise solution
Can you help me (show me how) to solve the following exercise?
For the process with transfer function $G(s)=e^{-2s}/(s+1)$ design a digital controller with sampling time $T_{s} = 1$ that meets the ...
3
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2answers
5k views
DSP Benchmarks for ARM Cortex-M4 processor
Does anyone know where there are any benchhmark timings for the DSP functionality in the ARM CMSIS V2 running on a Cortex-M4 processor. I am trying to work out whether this processor is powerful ...
14
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1answer
728 views
How to Improve Least Means Squares (LMS) / NLMS Filter Performance?
Are there ways to increase computational performance of a normalized least squares (NLMS) filter? Multidelay block frequency-domain (MDF) filters have been proposed to do this, but they also take away ...
