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The fingerprint of location can reach high precision and high accuracy with the assistance of complex positioning algorithms. However, the indoor environment is complex so that the accuracy of indoor positioning is affected easily and seriously by several kinds of signal interference. In this paper, we use iBeacon as anchor method to help WiFi positioning algorithms. In the hybrid algorithms, iBeacon...
In this letter, a power-control scheme for maximum sum-rate is proposed for the fading multiple access channels by considering the presence of primary users. Both the average transmit-power constraints and the peak interference-temperature constraints are considered. The interference caused by cognitive users must be under a pre-specified threshold for protecting primary users. The power-control optimization...
A hybrid system of cellular mode and device-to-device (D2D) mode is considered in this paper, where the cellular uplink resource is reused by the D2D transmission. In order to maximize the overall system performance, the mutual interference between cellular and D2D sub-systems has to be addressed. Here, two mechanisms are proposed to solve the problem: One is mitigating the interference from cellular...
Cognitive radio makes it possible for an unlicensed user to access a licensed spectrum opportunistically on the basis of non-interfering. This paper addresses the problem of resource allocation for multiaccess channel (MAC) of OFDMA-based cognitive radio networks, taking into account of the interference temperature constraints. The objective is to maximize the system utility, which is used to quantify...
Cognitive radio makes it possible for an unlicensed user to access a spectrum opportunistically. This paper addresses the problem of power control in cognitive radio networks, to maximize the system utility in the presence of interference temperature constraint. Penalty function is applied in the problem formulation to take into account the transmit power budget and interference temperature constraints,...
In this paper, an analysis framework to be used for WCDMA (wideband code division multiple access) networks dimensioning is proposed. The work attempts to combine interference limitation with hardware limitation, also considering the multi-service dimension of a WCDMA cellular system. The effect of these two factors towards access capacities of mixed service is analyzed, and with the method provided...
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