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Architectures for MIMO-OFDM Systems in Frequency-Selective Mobile Fading Channels

Architectures for MIMO-OFDM Systems in Frequency-Selective Mobile Fading Channels Architectures for MIMO-OFDM Systems in Frequency-Selective Mobile Fading Channels Abstract: Orthogonal frequency-division multiplexing (OFDM) is used in third and fourth generation and is being planned for fifth-generation (5G) systems. OFDM requires that the received subcarriers be orthogonal. However, various factors, such as residual carrier frequency offset due to Doppler shift in mobile fading channels, can lead to a loss in orthogonality between subcarriers, which results in intersymbol interference (ISI), intercarrier interference (ICI), and bit…

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Conjugate ICI cancellation techniques for 2×1 and 4×1 space-time transmit diversity OFDM systems

Conjugate ICI cancellation techniques for 2×1 and 4×1 space-time transmit diversity OFDM systems Conjugate ICI cancellation techniques for 2×1 and 4×1 space-time transmit diversity OFDM systems Abstract: Orthogonal frequency division multiplexing (OFDM) systems require orthogonality among subcarriers. Unfortunately, the conditions, such as, residual carrier frequency offset, time variations because of Doppler shift or phase noise, which thus destroys the orthogonality at the receiver, hence results in intercarrier interference (ICI) and degrades the bit error rate (BER) performance. In this paper, the conjugate cancellation…

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SPACE-time and space-frequency OFDM with convolutional precoding over fading channels

SPACE-time and space-frequency OFDM with convolutional precoding over fading channels SPACE-time and space-frequency OFDM with convolutional precoding over fading channels Abstract: Transmit diversity in orthogonal frequency division multiplexing (OFDM) has gained a lot of interest recently due to its ability to transform frequency selective fading into multiple flat fadings. In this paper we investigate 2 transmit and 1 receive (2Tx:1Rx) space-time OFDM (ST-OFDM) and space-frequency OFDM (SF-OFDM) systems in conjunction with convolutional precoding as a redundancy method to combat channel impairments. We built…

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Architectures for MIMO-OFDM Systems in Frequency-Selective Mobile Fading Channels

Architectures for MIMO-OFDM Systems in Frequency-Selective Mobile Fading Channels Architectures for MIMO-OFDM Systems in Frequency-Selective Mobile Fading Channels Abstract: Orthogonal frequency-division multiplexing (OFDM) is used in third and fourth generation and is being planned for fifth-generation (5G) systems. OFDM requires that the received subcarriers be orthogonal. However, various factors, such as residual carrier frequency offset due to Doppler shift in mobile fading channels, can lead to a loss in orthogonality between subcarriers, which results in intersymbol interference (ISI), intercarrier interference (ICI), and bit…

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Conjugate ICI cancellation techniques for 2×1 and 4×1 space-time transmit diversity OFDM systems

Conjugate ICI cancellation techniques for 2×1 and 4×1 space-time transmit diversity OFDM systems Conjugate ICI cancellation techniques for 2×1 and 4×1 space-time transmit diversity OFDM systems Abstract: Orthogonal frequency division multiplexing (OFDM) systems require orthogonality among subcarriers. Unfortunately, the conditions, such as, residual carrier frequency offset, time variations because of Doppler shift or phase noise, which thus destroys the orthogonality at the receiver, hence results in intercarrier interference (ICI) and degrades the bit error rate (BER) performance. In this paper, the conjugate cancellation…

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