Improving Space-Time-Frequency MIMOOFDM with ICI Self-Cancellation Scheme using Least Square Error Estimator

Authors

  • Nur Farahiah Ibrahim
  • Zahari Abu Bakar
  • Azlina Idris

DOI:

https://doi.org/10.24191/srj.v12i1.5436

Keywords:

Inter-carrier interference self-cancellation (ICI-SC), Multipleinput Multiple-output (MIMO), Orthogonal Frequency Division Multiplexing (OFDM), channel estimation, Least-square Error (LSE)

Abstract

Channel estimation techniques for Multiple-input Multiple-output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) based on comb type pilot arrangement with least-square error (LSE) estimator was investigated with space-time-frequency (STF) diversity implementation. The frequency offset in OFDM effected its performance. This was mitigated with the implementation of the presented inter-carrier interference selfcancellation (ICI-SC) techniques and different space-time subcarrier mapping. STF block coding in the system exploits the spatial, temporal and frequency diversity to improve performance. Estimated channel was fed into a decoder which combined the STF decoding together with the estimated channel coefficients using LSE estimator for equalization. The performance of the system was compared by measuring the symbol error rate with a PSK-16 and PSK-32. The results show that subcarrier mapping together with ICI-SC were able to increase the system performance. Introduction of channel estimation was also able to estimate the channel coefficient at only 5dB difference with a perfectly known channel.

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Published

2015-06-01

How to Cite

Ibrahim, N. F. ., Abu Bakar, Z. ., & Idris, A. . (2015). Improving Space-Time-Frequency MIMOOFDM with ICI Self-Cancellation Scheme using Least Square Error Estimator. Scientific Research Journal, 12(1), 25–37. https://doi.org/10.24191/srj.v12i1.5436