Transmit beamforming (Implicit feedback)

Before we start, few terms that we need to be clear with: MIMO channel sounding : In many cases, it is required to obtain a full characterization that details the measurement of the MIMO channel.It requires the transmission of sufficient number of High Throughput Long Training Fields (HT-LTFs) to sound the full dimensionality of theContinue reading “Transmit beamforming (Implicit feedback)”

802.11r – Fast BSS Transition (FT)

IEEE 802.11r was published in 2008 and was aiming for faster and secure handoff’s within the service set. It is also known as Fast Basic Service Set Transition (Fast BSS Set Transition) Key items involved when we talk about FT, Mobility Domain : Mobility Domain (MD) is a set of basic service sets (BSS) withContinue reading “802.11r – Fast BSS Transition (FT)”

Transmit Beamforming (TxBF)

Basics of Beamforming Beamforming is a technique that focuses a wireless signal towards a specific receiving device, rather than having the signal spread in all directions. We know that mostly the internal APs are equipped with omnidirectional antennes, so they send the signals in all directions. So, in order to make the signalling more efficient weContinue reading “Transmit Beamforming (TxBF)”

Wireless Vs Wired

CATEGORY WIRELESS WIRED User Mobility Nearly unlimited in a building Tethered to a physical outlet Setup Cost Relatively Low Relatively High Standard 802.11 802.3 Reliability Data loss could be higher depending on RF interference Data loss rate is fairly low due to reliable medium Principle CSMA/CA CSMA/CD Benefits – No hassles of cable– Best forContinue reading “Wireless Vs Wired”

Understanding an RF Signal

What is RF Signal ?A Radio Frequency signal is an electromagnetic wave that carries information over the air from one point to another. RF signals starts as an electrical Alternating Current (AC), generated by a transmitter. This AC signal travels through the copper conductor and radiates out of an antenna in the form of electromagnetic wave. WhatContinue reading “Understanding an RF Signal”