Adaptation of Algebraic Space Time Codes to Frequency Selective Channel

Adaptation of Algebraic Space Time Codes to Frequency Selective Channel

Ahmed Bannour (Higher School of Communications of Tunis Sup’Com, Tunisia), Mohamed Lassaad Ammari (Higher School of Communications of Tunis Sup’Com, Tunisia), Yichuang Sun (University of Hertfordshire, UK) and Ridha Bouallegue (Higher School of Communications of Tunis Sup’Com, Tunisia)
DOI: 10.4018/978-1-4666-1797-1.ch006
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The Algebraic Space Time Codes (ASTC) are constructed based on cyclic algebras; they showed a good spectral efficiency, a full diversity, and a full rate under non selective channel condition. However, the radio - mobile channel is a selective channel whose features vary during the time. This selectivity is owed to the multi-path phenomenon and generates interferences between symbols (IES). The overall objective of this chapter is to proof that ASTC is adapted to channel selectivity, in order to analyze and improve its performances in wide-band system.
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Despite the attractive features of both OFDM and ASTC they are very sensitive to the transmitter and receiver synchronization imperfections (A. Bannour M. A., 2010) (A. Bannour M. A., 2011). Thus, the synchronization is crucial for ASTC-MIMO-OFDM-based systems. Frequency synchronization errors destroy the orthogonality among the subcarriers which results in inter-carrier interference (ICI) (Renfors, 2007) (B.Swami, 2005) (Schlegel, 2002) (Peeters, 2002). Therefore an accurate CFO estimation is essential for OFDM receiver design. Various carrier synchronization schemes have been proposed for SISO OFDM systems. Some schemes rely on pilot or preamble data (Moose, 1994) (Cox, 2007) (Santella, 2002) (Mengali, An improved frequency offset estimator for OFDM applications, 2002) (S. Hyoung-Kyu, 2000) (Reggiannini, 2005) and some use the inherent structure of the OFDM symbol in either frequency (U. Tureli H. L., 1997) or time domain (J. J. van de Beek, 2002). For multiple antenna OFDM, data-aided schemes are proposed for receiver diversity and MIMO in (Czylwik, p. 1999) and (Stuber, 2001), respectively. A blind method for receiver diversity combined with OFDM is proposed in (U. Tureli D. K., 2001).

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