• Shailendra singh Rajput
• Prof. Agranshu Dwivedi
• Prof. Pushpendra Ahirwar

In this paper, we introduce a new iterative channel estimation technique with OFDM systems. The proposed channel estimator uses soft symbol decisions obtained by iterative detection and decoding (IDD) scheme to enhance the quality of channel estimate. The demands for high bandwidth & high speed application are growing at a faster rate and with the minimum tolerance of error. To enhance available bandwidth and improve the quality of transmission convolution codes are used on the OFDM (Orthogonal frequency division multiplexing) communication system over AWGN channel. In OFDM systems with channel estimation play a key role in overcoming distortions caused by phenomena like fading, delay spread and multipath effects. A series of review papers were already available to provide a history of the development of the field until the end of the last decade. During survey of work we have found that different authors have developed different methods to solve the purpose. So from the study of various papers we can easily conclude that there is not any unique method. Hence in this work we come across to develop a new iterative channel estimation OFDM algorithm.

OFDM, IDD, Convolution coding, AWGN channel, channel estimation, modulation scheme.

"A LITERATURE REVIEW ON EFFICIENT ITERATIVE OFDM CHANNEL ESTIMATION", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.4, Issue 8, page no.7-11, August-2017, Available :http://www.jetir.org/papers/JETIR1708003.pdf

"A LITERATURE REVIEW ON EFFICIENT ITERATIVE OFDM CHANNEL ESTIMATION", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.4, Issue 8, page no. pp7-11, August-2017, Available at : http://www.jetir.org/papers/JETIR1708003.pdf