Performance Analysis of Overloaded Mimo-Ofdm Systems Using Iterative Joint Turbo Decoding

Sujethaa N J, Sivagamasundhari. P

Abstract


The Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) employs turbo codes as its Forward Error Correction (FEC) standard along with multiple input, multiple output (MIMO) systems is used for achieving an excellent error correcting capability and higher throughput. Even if turbo decoding scheme gives adequate performance in ideal MIMO systems, but there is a significant performance degradation in an overloaded MIMO system when the number of transmit antennas is larger than that of receive antennas. In joint turbo decoding, controls of soft information be located accompanied for every permutation of bits from all stream. A super trellis diagram is obtained by combining the trellis diagram of each stream. Experimental results obtained through the joint turbo decoding achieve better performance than the turbo decoding scheme especially in the case of an overloaded MIMO systems. In this paper, BER and throughput for joint turbo decoding scheme is analyzed with different channels (TU channel, Rayleigh fading channel, Rician fading channel) and compared with viterbi decoding. Based on this analysis, joint turbo decoding scheme of MIMO systems with four transmit and two receive antenna of Rician fading channel achieved better performance with BER of 10-3 and higher throughput.

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References


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