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In this paper, we propose an user-oriented graph based frequency allocation algorithm for downlink transmission in the heterogeneous network. As different users may use different communication service, they would have different data rate requirement. It is critical to fulfill all users' traffic demand before enlarging the system throughput. So, the optimization objective is simultaneously improving...
In this paper, a joint control method for the user association and almost blank sub-frame (ABSF) based interference coordination (IC) technique in heterogeneous cellular networks is proposed. The optimization objective is simultaneously improving system throughput and guaranteeing proportionally fairness. Usually, user and base station (UE-BS) association is performed before ABSF rate determination,...
This paper investigates the power efficiency in downlink cooperative networks under spherical channel uncertainties, using a worst-case robust formulation. The aim of this paper is to jointly optimize the base station (BS) operation mode, mobile user (MU) association, and beamformings to achieve the robust network power gain. We formulate the problem as a mixed-integer non-convex problem with infinite...
Multiple-input multiple-output (MIMO) systems have drawn great attention in recent years due to their high throughput achieved in wireless systems. To reduce the space signal interference, the base station needs to perform a user selection algorithm when the number of users is greater than the number of antennas. User fairness is an important indicator in non-uniform channel. However, there is no...
Advanced interference coordination and resource management schemes are important in heterogeneous wireless networks in order to achieve a high network capacity and good user experience. In this paper, we present a joint consideration of the sub-channel allocation and power distribution in MIMO two-tier networks where the femtocells form clusters of equal size. All of the BSs have a multi-antenna configuration...
This paper investigates the problem of network selection in access control for heterogeneous networks of WCDMA/WLAN. To optimize the network selection decision policy, an optimization equation is defined with the objective of maximizing the total rewards, and then a new Q-learning Based Network Selection (QBNS) mechanism is proposed to solve the equation. In the QBNS Algorithm, Q-learning algorithm...
In order to solve channel estimation's pilot interference problem, this paper researched OFDM system channel estimation model, analyzed the OFDM symbol's pilot pattern, proposed a new octagon guide frequency pattern design method, and combined with low signal to noise space of virtual pilot technology, used the interpolation method to eliminate interference, further improved the OFDM system channel...
In order to alleviate the multipath interference of the MIMO multi-relay system and improve the system spectrum efficiency, this paper presents a cyclic delay distributed precoding relay scheme. The channel state information (CSI) sent from the source node, according to its phase information and relay node's matrix match, sends the signals to destination node via specific relay node, rather than the...
Wireless local networks (WLANs) that contain a high-density of access points (APs) are being deployed rapidly all around the world, where large numbers of idle APs exist. In this paper, a optimization for the deployment and transmitting power of AP is proposed in order to save energy and reduce frequency interference. It includes green AP clustering where Fuzzy K-mean algorithm is used, AP's second...
To solve the problem of low system yield of existing spectrum allocation algorithm in cognitive radio, an advanced algorithm based on system yield and maximal independent set (MIS) is proposed. The advanced algorithm is based on coloring model of spectrum allocation and the theory of MIS. The key part of this algorithm is to calculate priority of channels using system parameters such as amount of...
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