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Adaptive spectrally precoded orthogonal frequency-division multiplexing (ASP-OFDM) is a recently proposed adaptive modulation scheme to significantly improve the system throughput in adaptive OFDM applications. In this paper, new spectral precoder is proposed for ASP-OFDM with cyclic prefix (ASP-CP-OFDM) on the flat fading channel. By jointly adapting the precoding order for spectral precoder and...
Dynamic channel-aware user-selection and resource-allocation schemes are attractive for providing high system performance for multiple-input-multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) systems. In this paper, we investigate the combination of different techniques, resulting in user scheduling schemes for multiuser MIMO-OFDM systems employing orthogonal space-frequency block...
Adaptive transmission technique adopting spectrally-precoded orthogonal frequency-division multiplexing (SP-OFDM) signals is studied on the flat fading channel. By jointly adapting the precoding order for spectral precoder, transmission power, and the component modulation for OFDM, adaptive SP-OFDM is shown to outperform conventional adaptive OFDM significantly in average spectral efficiency.
In this paper we analyze the OFDMA downlink transmission performance of our proposed feedback (FB) reduction mechanism, where the base station (BS) predicts the FB (in terms of signal-to-noise ratio (SNR)) to reduce the FB overhead, hence increases the uplink throughput. In this mechanism, The BS uses well known recursive least square (RLS) algorithm as prediction tool which adapts with SNR variations...
In this paper, we present a multiuser scheduling technique for the MIMO-OFDM system over multipath frequency-selective fading channels to exploit the multiuser, space and frequency diversities. Two scenarios including full-feedback and limited-feedback channel information have been considered. A discrete-rate adaptive modulation is employed to increase the spectral efficiency of the system. Performance...
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