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This paper investigates the performance for the downlink massive multiple-input multiple-output system when the base station serves multiple user terminals (UTs) using zero-forcing precoding. The tight lower bound of average area spectrum efficiency (A2SE) is derived as a function of the number of transmission antennas, the number of UTs and the equivalent(More)
In this paper, we consider a two-way relay network with two sources and multiple cooperative relays in the presence of an eavesdropper. To guarantee the secrecy, a null space beamforming scheme is applied, where the relay beamforming vector lies in the nullspace of the equivalent channel of relay link from two sources to the eavesdropper. Our goal is to(More)
Users' quality of experience (QoE) is a key factor in the success of video applications over the Long Term Evolution (LTE) networks. Thus, evaluating the QoE of video applications is of tremendous importance in design and optimization of wireless video processing and transmission systems. In this paper, we propose a QoE measuring model for the quality of(More)
The secrecy capacity of relay communications is investigated in this paper, where an eavesdropper is present. Distributed precoding through multiple relay nodes can be used to enhance the received signal power at the destination node and to mitigate the signal leakage to the eavesdropper, simultaneously. Due to individual power constraints at relay nodes,(More)
In 3GPP LTE-Advanced networks deployed with type I relay nodes (RNs), resource partition is required to support in-band relaying. This paper focuses on how to partition system resources in order to attain improved fairness and efficiency. We first formulate the generalized proportional fair (GPF) resource allocation problem to provide fairness for all users(More)
In hybrid automatic repeat request (HARQ), maximum ratio combining (MRC) is usually employed at the receiver if the retransmission signal is the same as that in the first transmission. However, conventional performance analysis of HARQ and MRC does not consider that all previous transmissions fail. In this paper, we analyze the conditional error rate of(More)