Abstract

The Inter-Carrier-Interference (ICI) is considered a drawback in the utilization of Multiple-Input-Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems, due to the sensitivity of the OFDM towards frequency offsets which lead to loss of orthogonality, presence of signal interference and degrading the overall system performance. In this paper Residue Numbers as a coding scheme is impeded in MIMO-OFDM systems, where the ICI levels is measured and evaluated with respect to the conventional ICI mitigation techniques as pulse shaping, windowing and self-cancellation techniques implemented in MIMO-OFDM system. The Carrier-to-Interference Ratio (CIR), Bit-Error-Rate (BER) and the Complementary Cumulative Distribution Function (CCDF) for MIMO-OFDM system with Residue Number System (RNS) coding are analyzed and evaluated. The results demonstrated a performance enhancement in the transmission model with RNS implementation.

Highlights

  • In MIMO systems, the information signal is transmitted through the communication link through the usage of various Space–Time Block Coding (STBC) algorithms to achieve either higher transmission data rates or enhanced system BER performance for the same data rate [1], [2]

  • For MIMO-OFDM communication systems [5], the orthogonality seen in OFDM technique is lost within the sub-carriers due to the sensitivity of OFDM to frequency offset generated from the Doppler shift between the transmitter and the receiver

  • This paper propose an efficient ICI cancellation technique based on the utilization of Residue coding scheme; where the system is analyzed and compared to current mitigation techniques

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Summary

INTRODUCTION

In MIMO systems, the information signal is transmitted through the communication link through the usage of various Space–Time Block Coding (STBC) algorithms to achieve either higher transmission data rates or enhanced system BER performance for the same data rate [1], [2]. For MIMO-OFDM communication systems [5], the orthogonality seen in OFDM technique is lost within the sub-carriers due to the sensitivity of OFDM to frequency offset generated from the Doppler shift between the transmitter and the receiver This results in ICI between the transmitted symbols that cause performance degradation [6]. ANALYSIS OF INTER-CARRIER-INTERFERENCE In MIMO-OFDM systems, the loss of orthogonally between subcarriers, increases the ICI between sub-carriers and degrades the system performance The ICI components are the interfering signals transmitted on sub-carriers, where their complex coefficients are given by; S(l-k)

ICI MITIGATION TECHNIQUES
SYSTEM MODEL
SIMULATION RESULTS
CONCLUSION

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