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Details on Cryptography

What is cryptography ? Cryptography is the study of securing communications from those for who intend to read and possibly misuse the sensitive content of the communication. Encryption algorithms are used to encrypt the data by taking the original message, or plaintext, and converts it into cipher-text, which is not understandable. There are five primary functions ofContinue reading “Details on Cryptography”

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)”

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)”

Frequency

What is Wave Frequency ? A generic definition we would see over the internet would be: Frequency is defined as the number of waves that passes a fixed point for a given amount of time. But what does that really mean. Variables on which frequency mainly depends on is wavelength and time. Consider, the number of waves thatContinue reading “Frequency”

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”

Wired Vs Wireless

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 “Wired Vs Wireless”