Full duplex radio increases the frequency efficiency but its performance is limited by the self-interference(SI).We first analyze the multiple noises in the full duplex radio system and model such noises as an distrib...Full duplex radio increases the frequency efficiency but its performance is limited by the self-interference(SI).We first analyze the multiple noises in the full duplex radio system and model such noises as an distribution.Then we formulate a novel non-Gaussian SI problem.Under the maximum correntropy criterion(MCC),a robust digital non-linear self-interference cancellation algorithm is proposed for the SI channel estimation.A gradient descent based algorithm is derived to search the optimal solution.Simulation results show that the proposed algorithm can achieve a smaller estimation error and a higher pseudo signal to interference plus noise ratio(PSINR) than the well-known least mean square(LMS) algorithm and least square(LS) algorithm.展开更多
Cache-enabled small cell networks have been regarded as a promising approach for network operators to cope with the explosive data traffic growth in future 5 G networks. However, the user association and resource allo...Cache-enabled small cell networks have been regarded as a promising approach for network operators to cope with the explosive data traffic growth in future 5 G networks. However, the user association and resource allocation mechanism has not been thoroughly studied under given content placement situation. In this paper, we formulate the joint optimization problem of user association and resource allocation as a mixed integer nonlinear programming(MINLP) problem aiming at deriving a balance between the total utility of data rates and the total data rates retrieved from caches. To solve this problem, we propose a distributed relaxing-rounding method. Simulation results demonstrate that the distributed relaxing-rounding method outperforms traditional max-SINR method and range-expansion method in terms of both total utility of data rates and total data rates retrieved from caches in practical scenarios. In addition, effects of storage and backhaul capacities on the performance are also studied.展开更多
基金supported by the National Natural Science Foundation of China under Grants 61372092"863" Program under Grants 2014AA01A701
文摘Full duplex radio increases the frequency efficiency but its performance is limited by the self-interference(SI).We first analyze the multiple noises in the full duplex radio system and model such noises as an distribution.Then we formulate a novel non-Gaussian SI problem.Under the maximum correntropy criterion(MCC),a robust digital non-linear self-interference cancellation algorithm is proposed for the SI channel estimation.A gradient descent based algorithm is derived to search the optimal solution.Simulation results show that the proposed algorithm can achieve a smaller estimation error and a higher pseudo signal to interference plus noise ratio(PSINR) than the well-known least mean square(LMS) algorithm and least square(LS) algorithm.
基金supported by National Natural Science Foundation of China under Grants No. 61371087 and 61531013The Research Fund of Ministry of Education-China Mobile (MCM20150102)
文摘Cache-enabled small cell networks have been regarded as a promising approach for network operators to cope with the explosive data traffic growth in future 5 G networks. However, the user association and resource allocation mechanism has not been thoroughly studied under given content placement situation. In this paper, we formulate the joint optimization problem of user association and resource allocation as a mixed integer nonlinear programming(MINLP) problem aiming at deriving a balance between the total utility of data rates and the total data rates retrieved from caches. To solve this problem, we propose a distributed relaxing-rounding method. Simulation results demonstrate that the distributed relaxing-rounding method outperforms traditional max-SINR method and range-expansion method in terms of both total utility of data rates and total data rates retrieved from caches in practical scenarios. In addition, effects of storage and backhaul capacities on the performance are also studied.
