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Performance Comparison of OFDM System with Different Modulation Methods
| Communications on Applied Electronics |
| Foundation of Computer Science (FCS), NY, USA |
| Volume 5 - Number 2 |
| Year of Publication: 2016 |
| Authors: Sakshi Sharma, Rohan Gupta |
10.5120/cae2016652222
|
Sakshi Sharma, Rohan Gupta . Performance Comparison of OFDM System with Different Modulation Methods. Communications on Applied Electronics. 5, 2 ( May 2016), 18-21. DOI=10.5120/cae2016652222
Abstract
OFDM is a multicarrier technique for transmission, which divides the available spectrum into many carriers with each one of them being modulated by a data stream of low rate. OFDM is similar to FDMA in the sense that the multiple user access is achieved by further dividing the available bandwidth to multiple channels. These sub channels are then allocated to the users. But in OFDM, the spectrum is used much more efficiently by spacing the channels much close to one another. This is achieved by making all the carriers orthogonal to one another, preventing interference between these carriers. The digital data in serial form to be transmitted is split into different data streams, and each one of them is modulated by a separate carrier in the allotted bandwidth. The modulation done can be any one of the forms of modulation applied to digital data, but the most commonly used are quadrature phase shift keying (QPSK), and quadrature amplitude modulation (QAM). When these modulators are used, their outputs are summed linearly, and the output signal is sent to the channel. In this paper we will analyze the performance of different modulation techniques in AWGN channel. We conclude that a different modulation scheme has different bit error rate.
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