Browsed by
Category: Uncategorized

Understanding Noise – Part 5: Noise Performance of Cascaded Systems

Understanding Noise – Part 5: Noise Performance of Cascaded Systems

Thus far in this series on Understanding Noise we have looked at: Part 1: Defining Noise Part 2: Sources of Noise Part 3: Noise Spectral Density Part 4: Noise Factor, Noise Figure and Noise Temperature Modern radio receivers and electronic communications circuits consist of filters, amplifiers and mixers connected in series.  Each component contributes to the overall noise performance of the system as noise is added by each stage. This post will discuss how to calculate the contributions of each…

Read More Read More

Using the ODROID C2 as a WLAN Testing Tool – Part 4: Installing FruityWifi

Using the ODROID C2 as a WLAN Testing Tool – Part 4: Installing FruityWifi

My System Specifications I am running Dietpi on an ODroid C2.  Here are the Details of my OS, most recently updated at the time of this posting.: root@dietpi:~# cat /etc/*-release PRETTY_NAME=”Debian GNU/Linux 8 (jessie)” NAME=”Debian GNU/Linux” VERSION_ID=”8″ VERSION=”8 (jessie)” ID=debian HOME_URL=”http://www.debian.org/” SUPPORT_URL=”http://www.debian.org/support” BUG_REPORT_URL=”https://bugs.debian.org/ The OS is currently in a default state, I have done nothing except edit some locale/language information and the keyboard layout.  I have basically got a bare bones DietPi installation at this point. Installing FruityWiFi I have…

Read More Read More

Filters

Filters

Signal filtering plays a fundamental role in electronics and communications.  Filters modify specific frequency components of time-domain signals and are used as a tool for signal quality improvement, information recovery and frequency separation [1].  Filters are a fundamental frequency domain tool and as a component in electronic circuits and digital signal processing allow us to: Isolate circuits from DC (0Hz) currents. Suppress high and low frequency noise in received signals. Improve the spectral efficiency of transmitted signals. Separate the frequency…

Read More Read More