OFDM Towards Fixed and Mobile Broadband Wireless Access, Uma Shanker Jha & Ramjee Prasad (original) (raw)

An Overview: OFDM Technology an Emerging Trend in Wireless Communication

With the expansion of information interchanges innovation, the interest for Higher Data Rate Services, for example, interactive media, voice, and information over both wired and remote connections is likewise expanded OFDM is transmission strategy created to take care of the expanding demand for higher information rates in interchanges, which can be utilized as a part of both wired and remote situations. New strategies to enhance data rates are required to exchange the broad measure of information which existing procedures can't bolster. These strategies must have the capacity to give high Data rate, bit error rate (BER), maximum delay. In this paper, We have presented a survey of QoS in OFDM wireless networks along with resource allocation and scheduling algorithms, its impact and how this modulation scheme can be utilised to enhance the performance of data transmission in the future of wireless networks.

Enhancing Quality of Service using OFDM Technique for Next Generation Network

2011

migration to 4G networks will bring a new level of expectation to wireless communications. As after digital wireless revolution made mobile phones available for everyone, the higher speeds and packet delivery of 4G networks will make high quality multimedia available everywhere. The key to achieving this higher level of service delivery is a new air interface, OFDM, which is in turn enabled by the high level of performance. OFDM provides a robust signal that requires relatively little power yet uses bandwidth very efficiently. Carriers will benefit from greater flexibility by using OFDM, since in the same spectrum they will be able to offer more channels, including higher'ba ndwidth channels, with more types of services. Currently these systems are still being defined and prototyped. Achieving higher data rates requires OFDM systems to make more efficient use of the bandwidth than CDMA systems. One method of achieving this higher efficiency is through the use of higher order mod...

Orthogonal Frequency Division Multiplexing, OFDM for Optimizing the Services of Wireless Communication System

2017

The communication in the past decades has made the revolution in the ICT techniques. It is only due to the recent advancement communication techniques, OFDM have opened the developed area for further Research. Many advantages of OFDM over single carrier scheme is ,its ability to cope with severe channel conditions such as attenuation of high frequency in a long copper wire .OFDM is a multi-carrier modulation technique with densely spaced subcarriers that has gained a lot of popularity among the broadband community in the last few years. OFDM has been shown to be an effective technique to combat multipath fading in wireless communications. OFDM has chosen as the standard for digital audio broadcasting and high-speed wireless local areas networks. Present Paper, explore the OFDM Modulation its advantages and demerits, and some applications of OFDM. OFDM Techniques for peak-to-average power ratio reduction (PAPR), time and frequency synchronization, and channel estimation will be discu...

A Review on Orthogonal Frequency Division Multiplexing (OFDM

Orthogonal frequency division multiplexing (OFDM) is a special case of multicarrier transmission where a single DataStream is transmitted over a number of lower rate subcarriers. In July 1998, the IEEE standardization group decided to select OFDM as the basis for their new 5-GHz standard aiming a range of data stream from 6 up to 54 Mbps. This new standard is the first one to use OFDM in packet-based communications. In wireless communication, concept of parallel transmission of symbols is used to achieve high throughput and better transmission quality. Orthogonal Frequency Division Multiplexing (OFDM) is one of the techniques for parallel transmission. The idea of OFDM is to split the total transmission bandwidth into a number of orthogonal subcarriers in order to transmit the symbols using these subcarriers in parallel. In this paper we will discuss the basics of OFDM technique, role of OFDM in this era, its benefits and losses and also some of its application.

A Survey on OFDM and IEEE WLAN Standard

International Journal of Computer Applications, 2013

In the today’s multimedia communication scenario, the demand for high data rate, reliable, high quality digital data increased quickly. Due to the high data rate transmission and the capability to reduce the frequency selective fading into flat fading by separating the available spectra into multiple subcarriers, orthogonal frequency division multiplexing (OFDM) is a promising technique in the current broadband wireless communication system. This paper gives the progress of orthogonal frequency division multiplexing form historical aspect. All over the world OFDM is of the great interest by researchers and research laboratories which contributes the use of DFT, addition of cyclic prefix to remove the intersymbol interference and pilot insertion to reduce interference from multipath and co-channels. OFDM is not only used in cellular environment but also for LAN standard 802.11a/b/g/n. Also this paper will survey on the landscape of the IEEE 802.11 standard and give an overview of var...