Performance of BER for BPSK and DPSK (Coherent and Non-Coherent) Modulation in Turbo-Coded OFDM with Channel Equalization
Saruti Gupta1, Geetanjali Wassson2

1Saruti gupta, Department of Electronics n communication I.E.T bhaddal (Punjab Technical university), India.
2Geetanjali wasson, Assistant Professor ,Department of Electronics n communication I.E.T bhaddal (Punjab Technical university) , India.
Manuscript received on February 03, 2013. | Revised Manuscript received on February 27, 2013. | Manuscript published on March 05, 2013. | PP: 272-278 | Volume-3 Issue-1, March 2013. | Retrieval Number: A1372033113/2013©BEIESP
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Abstract: With the increasing demand of wireless communication, there will be growing need of design of high-speed wireless communication system. But gross frequency selective fading of wireless channel is a problem difficult to solve in design of system. Orthogonal frequency division multiplexing (OFDM) is quite effective to eliminate frequency selective fading of wireless channel, and is a simple and effective technique, so OFDM has been one of the most important techniques for high-speed wireless communication system. Then, the influence of cyclic prefix and adaptive channel equalization on the system performance is analyzed in various fading channel. However in fading environments the bit error rate (BER) increases. The performance can be improved by using some kind of channel coding. This form of OFDM is called coded-OFDM (COFDM). The turbo coding also allows achieving the Shannon’s bound Performance. In this paper we will design the OFDM system with channel Equalization under the powerful concatenated turbo codes to it. This will help to maintain the system performance under a desired bit error rate, as there were errors occurring in burst form which eventually degrades the efficiency of the system .This paper deals with the optimization to analyze the comparative study of BER for the BPSK and DPSK (coherent and non-coherent) modulation scheme to achieve higher data speed and less probability of error for robust and reliable communication under our proposed system model.
Keywords: OFDM, cyclic prefix, AWGN, Rayleigh, equalization, turbo encoder, turbo decoder, BPSK, DPSK, BER,