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In this paper we present the abstraction model of physical (PHY) layer of an Orthogonal Frequency Division Multiplexing (OFDM)-based powerline communication (PLC) system. This paper describes the PHY abstraction methodology suitable to predict the PHY layer error performance in a realistic powerline channel environment including frequency-selective interference. The approach to predict the PHY layer...
In this paper, we consider channel sounding for multi-sector cooperative beamforming in orthogonal frequency division multiplexing-based wireless cellular systems. The use of conventional sounding schemes may suffer from interference from other sectors and also require large signaling overhead. To reduce the sounding interference near the sector boundary as well as the signaling overhead, we allocate...
In this paper, we design an minimum mean-square error (MMSE)-type channel estimation scheme in orthogonal frequency division multiplexing-based wireless systems. By using the averaged channel frequency response (CFR) of pilot symbols in a group as a representative CFR, the proposed MMSE channel estimator can reduce the mean-square error (MSE) of channel estimation by achieving the signal-to-noise...
Orthogonal frequency division multiplexing (OFDM) has been considered as one of key transmission technologies for high-speed wireless communication systems. For channel-adaptive transmission of OFDM signal, base stations transmit a common pilot signal in the downlink, but mobile stations transmit individual pilot signal in the uplink. As a consequence, the uplink may suffer from poorer channel estimation...
Orthogonal frequency division multiplexing (OFDM) is considered as one of the most promising techniques for next generation mobile systems. When the OFDM is applied to cellular environments, it may suffer from so-called other-cell interference (OCI). In this paper, we propose a novel resource allocation scheme in OFDM-based asynchronous cellular systems. It can reduce the OCI by exploiting the repetitive...
In this paper, we consider a new channel probing scheme for opportunistic scheduling in the uplink of orthogonal frequency division multiplexing (OFDM)-based wireless systems. To reduce signaling overhead for the probing, we consider a two-step channel probing process; called pre-probing and mainprobing. Good subchannels are first estimated through the pre-probing process using a probing signal transmitted...
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