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In TD-LTE-A system, dual layer beamforming is introduced to improve throughput of specific users with high SINRs. In order to solve the problem of resource allocation for multi-user dual layer beamforming, a low complexity joint user grouping and resource allocation algorithm is proposed in this letter. We first calculate priorities of all active users according to channel quality and then the resource...
Heterogeneous Network (HetNet) is a promising solution to enhance network capacity and extend network coverage by increasing cell site density in Long Term Evolution-Advanced (LTE-Advanced) systems. However, dense deployment of cell sites not only increases desired signal strength, but also intercell interference as cell sites get closer. To combat with intercell interference, Joint Processing Coordinated...
Coordinated multipoint (CoMP) is proposed recently as a promising technique to improve the performance of cellular networks and meet the increasing demand for digital service. However it faces several constraints to perform CoMP scheme in real systems. In this paper, we consider a downlink CoMP system and formulate the resource allocation problem of it in terms of resource block (RB) scheduling and...
In TD-LTE-A system, the objective of conventional non-codebook beamforming algorithms is to maximize sum capacity to accommodate more users. However, fairness among users is not considered by these algorithms, and the performance of users with poor channel quality will always be bad. To relax the fairness requirement in resource allocation, this paper first introduces two parameters of user satisfaction...
This paper considers energy-constrained cognitive radios (CR) which can access a time-slotted licensed spectrum band in hybrid mode. At the beginning of each time slot, CR decides whether to be idle or to transmit. If transmission, CR has to determine which access mode to operate in. If the underlay mode is selected, CR shares spectrum with licensed systems by transmitting with a low power to ensure...
Radio spectrum underutilization and energy inefficiency become urgent bottleneck problems to the sustainable development of wireless technologies. The research philosophies of wireless communications have been shifted from balancing reliability-efficiency tradeoff in the link level to seeking spectrum-energy efficiency in the network level. Global spectrum-energy efficient designs attract significant...
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