Communications

  • The Hilbert Transform - Part 2 Hilbert Transform Part 2This is part two of a multi-part series that defines The Hilbert Transform and its significance. In this part we talk about some of the properties of Hilbert Transform.
  • The Hilbert Transform - Part 1 Hilbert TransformThis is part one of a multi-part series that defines The Hilbert Transform and its significance. 1. Definition The Hilbert transform \mathscr{H} of a signal g(t) is defined as \begin{eqnarray} \mathscr{H} = g(t) * \frac{1}{\pi t} = \frac{1}{\pi} \int_{-\infty}^{\infty} \frac{g(\tau)}{t-\tau} d\tau = \frac{1}{\pi} \int_{-\infty}^{\infty} \frac{g(t-\tau)}{\tau} d\tau \end{eqnarray} The Hilbert transform of g(t) is the convolution of g(t) with the signal 1/t. It ...
  • Some great free Electrical Engineering books great_free_electrical_engineering_booksIn this post we introduce some great free Electrical Engineering books. Although free sometime means low-quality, but as you will find the books in this list are written buy some of the most well known experts in their fields.
  • Know Your Eb/N0 - Part 3 Know Your Eb/N0 part 3This is the last part of our three-part series that explains the meaning of E_b/N_0 in digital communication context. Calculating E_b/N_0 Having understood how Gaussian noise comes to affect transmitted symbols, it remains to define an appropriate average signal energy, and hence a signal-to-noise ratio (SNR). A commonly used definition of SNR is E_b/N_0, where E_b is ...
  • Know Your Eb/N0 - Part 2 Know Your Eb/N0 part 2This is the second part of our three-part series that explains the meaning of E_b/N_0 in digital communication context. Signal Constellations Often, particularly in the specification of signal sets used in modems, we rely on the notion of an orthonormal basis. A set \Phi=\{\phi_1(t), \phi_2(t), \cdots, \phi_N(t)\} is an orthonormal basis if \langle\phi_i(t),\phi_j(t)\rangle=\delta_{ij}:=\begin{cases} 1 ...
  • Know Your Eb/N0 - Part 1 Know Your Eb/N0part 1This is part one of a three-part series that explains the meaning of E_b/N_0 in digital communication context. Introduction Every student of communications knows that digital communication system performance—for example, bit error rate (BER) or frame error rate (FER)—depends on the signal-to-noise ratio (SNR), with higher SNRs leading to lower BERs and FERs. Sometimes less ...
  • Step Response In a Hybrid Lumped-Distributed Network Introduction Transmission line theory has been around for more than a century. However, the distributed nature of it has kept it interesting for all these years. One interesting subject is the step response in a hybrid lumped-distributed network. While for a purely lumped network it is quite easy to analyze and derive the response equation, for a distributed or a hybrid ...
  • Sample-Timing Skew in Time Interleaved ADC Sample-Timing Skew in Time Interleaved ADCIn digital communication systems, Analog-to-Digital Converter (ADC) is the main interface between the analog domain and the digital domain. The continuous rising demand for high data rate communication systems has been creating the need for wide-band ADCs with a high sampling rate and high accuracy. These ADCs need to achieve high speed and high resolution ...
  • MATLAB tips and tricks: part 2 MATLAB tips and tricks part 2This is the second part of our "MATLAB tips and tricks" series. As we also mentioned in part 1, MATLAB is the programming language of choice for many engineers, scientists, data analysts, and more. In this post we introduce some interesting MATLAB tips and tricks. They can be used to make writing code easier and ...
  • Single Carrier FDMA Modulation Scheme Single Carrier FDMASingle Carrier Frequency Division Multiple Access (SC-FDMA) is an alternative modulation scheme to Orthogonal Frequency Division Multiple Access (OFDMA) employed in the uplink Long Term Evolution (LTE) cellular wireless communications systems. The SC-FDMA has similar performance and essentially the same overall complexity as OFDMA system. The OFDMA waveform exhibits a high Peak-to-Average Power Ratio (PAPR), ...

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