Abstract
Space-time block-coded orthogonal frequency division multiplexing (OFDM) transmitter diversity techniques have been shown to be efficient means of achieving near-optimal diversity gain in frequency-selective fading channels. However, these known techniques all require a cyclic prefix to be added to the transmitted symbols, resulting in bandwidth expansion. In this paper, iterative space-time and space-frequency block-coded OFDM transmitter diversity techniques are proposed that exploit spatial diversity to improve spectral effciency by eliminating the need for a cyclic prefix.
Highlights
The last decade has witnessed an explosive growth of wireless communications, especially in mobile communications and personal communications services (PCS)
It has been shown in [3, 4] that space-time and space-frequency block-coded orthogonal frequency division multiplexing (OFDM) (STBC-OFDM and SFBC-OFDM) systems are efficient means of achieving near optimum diversity gain in frequency-selective fading channels. These previously proposed OFDM transmitter diversity systems all require a cyclic prefix to be added to the transmitted symbols to avoid intersymbol interference (ISI) and interchannel interference (ICI) in the OFDM symbols, and the number of cyclic prefix symbols has to be equal to or greater than the order of the wireless channels [5]
A number of equalization techniques have been proposed to reduce the negative effects of ISI and ICI for OFDM systems without a cyclic prefix or when the cyclic prefix is shorter than the channel memory [8, 9, 10, 11, 12]
Summary
The last decade has witnessed an explosive growth of wireless communications, especially in mobile communications and personal communications services (PCS). A number of space-time coded orthogonal frequency division multiplexing (OFDM) transmitter diversity techniques have recently been proposed for high data rate wireless communications [1, 2, 3, 4]. It has been shown in [3, 4] that space-time and space-frequency block-coded OFDM (STBC-OFDM and SFBC-OFDM) systems are efficient means of achieving near optimum diversity gain in frequency-selective fading channels. We propose iterative space-time and spacefrequency block-coded OFDM (ISTBC-OFDM and ISFBCOFDM) transmitter diversity techniques that do not require a cyclic prefix and, are more bandwidth efficient than previously proposed systems.
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