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In this work1, generalized frefix (GP) for space time block coded orthogonal frequency division multiplexing (STBC-OFDM) systems is considered in the presence of correlated channel. The 2×2 STBC case, in practice, lead to significant correlation among the spatial signatures and reduce the systems performance. There are several structures to reduce correlation. To solve this problem, we propose the...
Antenna correlation limits the multiplexing gain achieved by practical MIMO-OFDM systems and degrades the performance significantly. Recently, investigations are focused to reduce the antenna correlation by the designing new antenna structures. Differently, in this paper, we propose the generalized prefix approach to solve problem for correlated MIMO-OFDM system. It is shown that the proposed generalized...
Consumers require increasing data rates and therefore it is important to develop techniques that increase the spectrum efficiency. MIMO OFDM is a fundamental technology for high data rate wireless systems. Correlation among the different spatial streams is the main factor limiting the spectral efficiency. All practical MIMO OFDM wireless systems use cyclic prefix (CP). In this paper we propose a novel...
In the case of orthogonal frequency-division multi-plexing (OFDM) systems, associated subcarriers can experience deep fades. When a cyclic prefix (CP) is used, CP-OFDM systems suffer from deep fading effects. With the channel coding and interleaving, coded OFDM provides a robust communication link for wireless channels. Coded CP-OFDM (COFDM) is one of the widely used transmission techniques for overcoming...
All practical orthogonal frequency-division multiplexing (OFDM) systems require a prefix to eliminate intersymbol interference (ISI) at the receiver. Cyclic prefix (CP) and zero padding are well-known prefix construction methods, with the former being the most employed technique in practice due to its lower complexity. In this paper, we construct an OFDM system with a generalized CP. It is shown that...
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