What type of modulation is OFDM?

Orthogonal Frequency Division Multiplexing (OFDM) is an efficient modulation format used in modern wireless communication systems including 5G. OFDM combines the benefits of Quadrature Amplitude Modulation (QAM) and Frequency Division Multiplexing (FDM) to produce a high-data-rate communication system.

How does OFDM modulation work?

An OFDM signal consists of a number of closely spaced modulated carriers. When modulation of any form – voice, data, etc. is applied to a carrier, then sidebands spread out either side. It is necessary for a receiver to be able to receive the whole signal to be able to successfully demodulate the data.

What is OFDM index modulation?

OFDM with index-modulation (OFDM-IM) has been recently proposed by Basar et al. [4]. The essential idea of OFDM-IM is to use the indices of the subcarriers to carry information. Some carriers are set to zero (i.e. inactive); the indices of the active subcarriers carry information.

What is OFDM what are its advantages and application?

OFDM stands for orthogonal frequency division multiplexing, it has been used in many high data rates wireless communication system because of the many advantages it provides. This article gives information about the advantages and disadvantages of OFDM to know more details about it.

What is the difference between OFDM and FDM?

In FDM, Bandwidth (B) is committed to the different sources. Orthogonal Frequency Division Multiplexing (OFDM): It is also the multiplexing technique which is used in analog system. In OFDM, Guard band is not required and the spectral efficiency of OFDM is high which oppose to the FDM.

How OFDM is implemented?

OFDM is based on the well-known technique of Frequency Division Multiplexing (FDM). In FDM different streams of information are mapped onto separate parallel frequency channels. Each FDM channel is separated from the others by a frequency guard band to reduce interference between adjacent channels.

What is the basic fundamental principle of OFDM system?

The basic principle of OFDM is to split a high-rate datastream into a number of lower rate streams that are transmitted simultaneously over a number of subcarriers.

What is OFDM advantages and disadvantages?

It has improved the quality of long-distance communication by eliminating InterSymbol Interference (ISI) and improving Signal-to-Noise ratio (SNR). The main drawbacks of OFDM are its high peak to average power ratio and its sensitivity to phase noise and frequency offset.

Why do we need OFDM?

Primarily, OFDM is more resilient to electromagnetic interference, and it enables more efficient use of total available bandwidth because the subchannels are closely spaced. It is also more resistant to interference because several channels are available.

What is the advantage of OFDM compared to FDM?

The OFDM technique is advantageous over FDM because it is more spectrally efficient by placing the subchannels closely until they generate an overlapping effect. Multipath distortion and RF interference are the major issues in the FDM technique while OFDM is immune to these problems.

Which property of OFDM system allows?

Which property of OFDMA system allows adjacent subcarriers to be used without interference? Explanation: Orthogonality of sub-carriers simply means their correlation is zero. Orthogonality in OFDMA system allows adjacent subcarriers to be used without interference.

Where is OFDM used?

Orthogonal frequency division multiplexing (OFDM) is a modulation technique that is used in several applications ranging from cellular systems (3GLTE, WiMAX), wireless local area networks (LANs), digital audio radio, underwater communications, and even optical light modulation.

Why OFDM is efficient?

The fact that OFDM uses a large number of carriers, each carrying low bit rate data, means that it is very resilient to selective fading, interference, and multipath effects, as well providing a high degree of spectral efficiency.