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We propose a resource allocation method for the downlink of an orthogonal-frequency-division-multiple-access (OFDMA)-based macrocell/femtocell overlaid heterogeneous network. To mitigate the interference caused by femtocell base stations (FBSs) on nearby macrocell users (MUs), conventional methods rely on the information of the interference channel states, as well as MU allocation mapping provided...
In this paper, we propose a self-organized resource allocation method in a macrocell/picocell heterogeneous network employing Cell Range Expansion (CRE). To protect expanded Pico User Equipments (ePUEs) from severe Macro Base Station (MBS) interference in downlink, in the conventional method, MBS makes use of reduced power Almost Blank Subframes (ABSs) where ePUEs can be scheduled. However, this severely...
In this paper, we propose channel estimation methods for LTE (Long Term Evolution)-Advanced system based on compressed sensing. Taking advantage of the fact that typical LTE-Advanced downlink channels are composed of a small number of dominant taps, compressed sensing enables us to take the time-domain approach for the estimation using DM-RS (Demodulation Reference Signal), even when the amount of...
The paper considers a time domain channel estimation approach for uplink OFDMA (Orthogonal Frequency Division Multiple Access) systems. Although frequency domain channel estimation schemes are widely used for those systems, we propose time domain channel estimation schemes by taking advantage of the sparsity of channel impulse response with compressed sensing. Numerical simulations show the merit...
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