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This paper investigates the performance of bidirectional dynamic networks (BDN) with massive multiple input multiple output (MIMO) systems. In BDN, dynamic allocation of the number of uplink and downlink remote radio heads (RRHs) is proposed, which offers a flexible solution to balance the data traffic asymmetry without requiring the time synchronization. Intuitively, the interference between the...
This paper considers interference mitigation with power allocation in cognitive radio systems. In such a system, cognitive radio is designed to transmit data to its corresponding users without causing any interference to the current primary transmission. To avoid these interference between these links, the secondary transmitters sense the primary user's unused eigenvector space and reuse these spatial...
In this paper, a channel estimation (CE) and precoding scheme by using H-infinity (H-inf) criterion for mitigation of pilot contamination (PC) in Massive multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is reconsidered. Firstly, different thresholds in H-inf CE and precoding are considered. Secondly, asymptotic analysis of the large system is applied...
The multi-user distributed antenna system (MUDAS) is considered as a promising technology in the future wireless communication. Compared to the multi-user centralized antenna system (CAS), MU-DAS can improve the spectral efficiency significantly. One most attractive feature is that the implementation of the MU-DAS can be reduced by using the clustering approach of the remote antenna units (RAUs)....
A utility function that reflects the total channel utility rate is formulated based on the interference complementary under the centralized singular channel wireless networks. Furthermore the target is transformed into a constrained convex optimization, and the optimization problem achieves the efficient resource allocation under interior-point method. Simulation results show that the proposed method...
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