Comparison of BER of OFDM System using QPSK and 16QAM over Multipath Rayleigh Fading Channel using Pilot-Based Channel Estimation
Sanjay Kumar Khadagade1, N.K. Mittal2
1Sanjay khadagade, Electronics and Communication, RGPV, O.I.S.T. Bhopal, India.
2N.K. Mittal, Electronics and Communication, RGPV, O.I.S.T.  Bhopal, India.
Manuscript received on January 20, 2013. | Revised Manuscript received on February 06, 2013. | Manuscript published on February 28, 2013. | PP: 26-32 | Volume-2 Issue-3, February 2013.  | Retrieval Number: C0982022313/2013©BEIESP

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Abstract: This paper investigate and compare the various channel estimation techniques based on pilot arrangement with the communication system that uses QPSK and 16-QAM to transmit information using OFDM over multipath Rayleigh fading channel. Bit Error Rate (BER) has been considered as the performance index in all analysis. In the block type pilot arrangement, the performance of channel estimation is analyzed with three different algorithms: LS, LMMSE and SVD algorithm. In comb type pilot arrangement, the paper introduces three method of interpolation: linear interpolation, second order interpolation and cubic spline interpolation for channel estimation. The analysis has been carried out with simulation studies under MATLAB environment.
Keywords: Channel Estimation, OFDM, Pilot Symbol, Rayleigh Fading channel.