An Efficient Optimal Pilot Design Scheme for Channel Estimation in MIMO-OFDM Systems
L. Kebila Anns Subi and Dr.A. Albert Raj
The high data transmission rates in the communication channel are a recent growing demand, which is accomplished by using the multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) systems because of their unique properties. The OFDM systems that endorse the cyclic-delay diversity (CDD) scheme which requires an operation of inverse discrete Fourier transform (IDFT) at the transmitter. Hence, the CDD affords a low-complexity by means of accumulating the transmission diversity in MIMO-OFDM systems. Yet, the optimal pilot string minimizes the channel estimation of the mean square error (MSE) of in traditional MIMO-OFDM systems are irrelevant to CDD-OFDM systems. Thus, this paper emanates by determining the principle which results the minimum MSE of both the least squares (LS) and the MMSE channel estimate in CDD-OFDM systems. The imitative criteria's are used to establish a universal methodology for decisive the optimal pilot string. Well, the proposed methodology enables the prominence of the channel to be estimated using single OFDM symbols. We have correlated the conduct of the channel estimation algorithm by grading the bit error rate vs. SNR with BPSK, QPSK 16-PSK and 256-PSK modulation schemes.
Keywords: Orthogonal Frequency-division Multiplexing, Multiple Input-Multiple Output Technologies, Channel Estimation, Cyclic Delay Diversity, Optimal Pilot Design, Inter Carrier Interference (ICI).
Volume: 5 | Issue: 1
Paper ID : IJPPAS104976
Issue Date: February , 2017Full Text