Articles - Page 28 of 28

July 1, 2016 DSP

What is a Signal?

In traditional Digital Signal Processing (DSP) courses, we usually learn about signals in a narrow context. While this is probably

Illustration of peak ISI and asymmetry about -3dB point

July 18, 2016 Miscellaneous

Pulse Shaping Filter

From the previous articles, we have seen how a Tx generates a signal from the numbers and the Rx recovers

$Spectral efficiency R_b/B versus E_b/N_0 determines the overall merit of a modulation scheme. This figure is drawn for BER = 10^{-5} and a Square-Root Raised Cosine pulse with 50% excess bandwidth$

June 1, 2016 Wireless/SDR

Computing Error Rates

Having built a simple digital communication system, it is necessary to know how to measure its performance. As the names

A complex number with its I and Q components

July 4, 2016 DSP

Dealing with Complex Numbers

Although complex notation is not complex to understand, I attempt to avoid complex notation altogether while writing DSP articles. If

Minimum distance rule based detector decisions in a QPSK constellation in the presence of a carrier frequency offset

June 6, 2016 DSP / Wireless/SDR

How a Frequency Locked Loop (FLL) Works

We saw before how a carrier frequency offset distorts the received signal. Later, we also described the classification of frequency