Fading: An introduction to large scale fading
Large scale fading and its implications.
Small Scale Fading
Small scale fading, and modelling Line of Sight (LOS) and Non-Line of Sight (NLOS) fading.
Amplifier Non Linearity
In this post, we look at Power Amplifiers (PAs) which are used to boost the power of the transmit signal at the output of the upconversion. We concern ourselves with the various effects that can happen due to non-linearity of PAs.
Bit Error Rate in an AWGN Channel
In all digital modulation schemes, the bit error rate (BER) is an important metric. The BER is a direct measure of the possible data throughput under the given circumstances. That is, the smaller the BER, the better. In this post, we look at the effect of an additive white gaussian noise (AWGN) channel on the BER of some common modulation schemes.
Discrete Time Signal Processing: A Primer
(Under construction) Discrete signals are how computers handle approximations of continuous variants. In this post, we consider their representation, taxonomy and processing.
Introduction to Communication Systems
(Under construction) A gentle introduction to the basic concepts of communication systems.
Introduction to Single Carrier Transmission
We explore the building blocks of single carrier transmission and encounter its limitations imposed due to the well-known Nyquist criterion.
IQ Imbalance and Correction
In this post, we consider the task of downconversion from a given RF signal using both its in-phase (I) and quadrature (Q) components. We understand the implications of imbalance between the two components and how the situation is handled in practical systems.
OFDM Channel Estimation
The goal of this post is to give the reader a clear understanding of a working channel estimation scheme. Therefore, we look at how a simple channel estimation can be performed on a WiFi packet with multiple OFDM symbols and possibly decode the packet.
OFDM Synchronisation: Schmidl and Cox Technique
Given some received OFDM signal like the following, how can one know at which point in time the OFDM symbols are located? Or, equivalently, on which signal part the receiver needs to perform the FFT?