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To solve the multi-cell interference problem in downlink cellular networks, we study G-cell multiple input multiple output Gaussian interfering broadcast channels (MIMO-IFBC) with K users on the cell-boundary of each base station (BS). The main idea is to align interfering channels from each BS to its non-intended users onto a small dimensional subspace. This is called interfering channel alignment...
In cooperative context-aware computing, the synchronized context information among devices is critical to the system performance. In this work, we propose an energy efficient context synchronization scheme using the reference-credit concept. Simulation results show that it improves energy efficiency by approximately 50% compared to the legacy random synchronization scheme which is popular in use....
Heterogeneous cellular networks which consist of macrocells and small cells can offer significant capacity gain by utilizing the resources of the small cells. However, to achieve this, the interference between the macrocells and the small cells must be carefully managed. In this work, we propose an uplink intercell interference control (ICIC) scheme which is a unified ICIC approach of handover based...
In heterogeneous cellular networks (HCN) which consists of macrocells and numerous picocells, efficient interference management schemes between macrocells and picocells are so crucial to the overall system performance. We propose a dynamic cooperative silencing control (DCS) scheme for intercell interference control (ICIC). It is a low-complex, low-feedback and distributed algorithm using only strongly...
We explore the interplay between interference, cooperation, and feedback in multi-cell networks. Specifically, this paper focuses on G-cell multiple-input multiple-output Gaussian interfering broadcast channels (MIMO-IFBC) with K cooperating users on the cell-boundary of each base station. It corresponds to a downlink scenario for cellular networks with G base stations, and K users equipped with Wi-Fi...
In this paper, we investigate an interference management scheme relying on multiple antennas in heterogeneous networks with a mixed macro and pico deployment. Our main contribution is to propose a new interference alignment scheme for the heterogenous network. Specifically, our scheme successively creates transmit beamforming vectors for the pico base stations (BSs) and for the macro base station...
The mitigation of intercell interference is a central issue for future-generation wireless cellular networks where frequencies are reused aggressively and where hierarchical cellular structures may heavily overlap. The paper examines the benefit of coordinating transmission strategies and resource allocation schemes across multiple cells for interference mitigation. For a multicell network serving...
In heterogeneous cellular networks (HTN) which consists of macro-cells and numerous femto-cells, efficient interference management schemes between macro-cells and femto-cells are so crucial to the overall system performance. To mitigate inter-cell interference in the HTN, we propose a new rate-split transmission scheme which has following characteristics. First, it guarantees serving user''s QoS by...
This paper focuses on two-cell multiple-input multiple-output (MIMO) Gaussian interfering broadcast channels (MIMO-IFBC) with K cooperating users on the cell-boundary of each BS. It corresponds to a downlink scenario for cellular networks with two base stations (BSs), and K users equipped with Wi-Fi interfaces enabling to cooperate among users on a peer-to-peer basis. In this scenario, we propose...
This paper proposes a joint proportionally fair scheduling and dynamic power spectrum adaptation algorithm for wireless multicell networks. The proposed system allows multiple base-stations in a multicell network to be coordinated by exchanging interference pricing messages among each other. The messages summarize the effect of intercell interference, and they are functions of transmit power spectra,...
A two-way relaying system using the physical-layer network coding (PNC) does not cause the spectral loss induced by the half-duplex signaling. Furthermore, when the total power, which is limited, is properly distributed to transmission nodes in such a system, the system capacity will be enhanced significantly. In this paper, we propose an optimal power allocation in the two- way relay channel employing...
Relay-assisted space-time block code (STBC) and space-frequency block code (SFBC) for single carrier frequency-domain equalization (SC-FDE) were presented. They achieve spatial diversity over fading relay channels under the assumption of perfect channel state information (CSI). In this paper, we propose a pilot position selection/detection technique for channel estimation of those systems. Unlike...
In order to estimate doubly selective channels in orthogonal frequency division multiplexing (OFDM) systems, we derive a linear minimum mean square error (LMMSE) channel estimator by considering fast time-variant channel estimation by Wiener filtering. To reduce the computational complexity of the LMMSE estimator, we also present an approximate LMMSE (ALMMSE) estimator. This estimator obtains partial...
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