Orthogonal frequency division multiplexing Wikipedia

In telecommunications, orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. OFDM has developed into a popular scheme for wideband digital communication, used in applications such as digital television and audio broadcasting, DSL internet access, wireless networks, power line networks, and 4G mobile communications.

Orthogonal frequency division multiple access Wikipedia

Orthogonal frequency-division multiple access (OFDMA) is a multi-user version of the popular orthogonal frequency-division multiplexing (OFDM) digital modulation scheme. Multiple access is achieved in OFDMA by assigning subsets of subcarriers to individual users. This allows simultaneous low-data-rate transmission from several users.

OFDM and Multi Channel Communication Systems

1. Frequency Division Multiplexing Frequency division multiplexing (FDM) involves the allocation of each channel to a unique frequency range. This frequency range prescribes both the center frequency and channel width (bandwidth).

LTE OFDM Technology Tutorials Point

To overcome the effect of multi path fading problem available in UMTS, LTE uses Orthogonal Frequency Division Multiplexing (OFDM) for the downlink - that is, from the base station to the terminal to transmit the data over many narrow band careers of 180 KHz each instead of spreading one signal over the complete 5MHz career bandwidth ie.

RF Avenue Digital Modulation Tutorial Theory Tools

Orthogonal Frequency Division Multiplexing (OFDM) OFDM - Masters thesis by James Shen and Mathew Liu. This 90 page report quite thoroughly covers the theory, math, and history behind OFDM.

What does Orthogonal means in Wireless Networks

The orthogonality concept is one of the most important and crucial mechanisms that allow the existence of modern wireless systems such as WCDMA and LTE.

CCNA Training » Wireless Tutorial 9tut com

Wireless Encoding. When a wireless device sends data, there are some ways to encode the radio signal including frequency, amplitude & phase. Frequency Hopping Spread Spectrum(FHSS): uses all frequencies in the band, hopping to different ones after fixed time intervals.Of course the next frequency must be predetermined by the transmitter and receiver.

Frequency offset estimation using 802 11a short preamble

From the previous post on OFDM (), we have understood that an OFDM waveform is made of sum of multiple sinusoidals (also called subcarriers) each modulated independently.In this post, let us try to understand the estimation of frequency offset in a typical OFDM receiver (using the short preamble specified per IEEE 802.11a specification as a reference).

RF Avenue Digital Demodulation Tutorial Theory Tools

Directory of RF & microwave resources for designers of digital wireless communication systems. Includes tutorials, theory, circuit design, products, software, books, book reviews, and more.

CCNA Training » Wireless Tutorial 9tut com

In this article we will discuss about Wireless technologies mentioned in CCNA. Wireless LAN (WLAN) is very popular nowadays. Maybe you have ever used some wireless applications on your laptop or cellphone.